JP4560284B2 - Anticorrosion coating composition for gas transport steel pipe and gas transport steel pipe - Google Patents
Anticorrosion coating composition for gas transport steel pipe and gas transport steel pipe Download PDFInfo
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- JP4560284B2 JP4560284B2 JP2003328353A JP2003328353A JP4560284B2 JP 4560284 B2 JP4560284 B2 JP 4560284B2 JP 2003328353 A JP2003328353 A JP 2003328353A JP 2003328353 A JP2003328353 A JP 2003328353A JP 4560284 B2 JP4560284 B2 JP 4560284B2
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- steel pipe
- gas transport
- coating composition
- pigment
- transport steel
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- 229910000831 Steel Inorganic materials 0.000 title claims description 62
- 239000010959 steel Substances 0.000 title claims description 62
- 239000008199 coating composition Substances 0.000 title claims description 52
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- 238000000576 coating method Methods 0.000 claims description 47
- 239000011248 coating agent Substances 0.000 claims description 45
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- 239000003795 chemical substances by application Substances 0.000 claims description 23
- -1 zinc borate compound Chemical class 0.000 claims description 21
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- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004593 Epoxy Substances 0.000 claims description 9
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 7
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 7
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 7
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- 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 5
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- 229910019142 PO4 Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- OWYWGLHRNBIFJP-UHFFFAOYSA-N Ipazine Chemical compound CCN(CC)C1=NC(Cl)=NC(NC(C)C)=N1 OWYWGLHRNBIFJP-UHFFFAOYSA-N 0.000 description 1
- RDMJFZNNEOUPBD-UHFFFAOYSA-N P([O-])([O-])[O-].[Zn+2].[Al+3] Chemical compound P([O-])([O-])[O-].[Zn+2].[Al+3] RDMJFZNNEOUPBD-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- QPLNUHHRGZVCLQ-UHFFFAOYSA-K aluminum;[oxido(phosphonooxy)phosphoryl] phosphate Chemical compound [Al+3].OP([O-])(=O)OP([O-])(=O)OP(O)([O-])=O QPLNUHHRGZVCLQ-UHFFFAOYSA-K 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
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- 239000002585 base Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
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- 238000009933 burial Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- VSFBSEDSFCLXNI-UHFFFAOYSA-N calcium;zinc;phosphite Chemical compound [Ca+2].[Zn+2].[O-]P([O-])[O-] VSFBSEDSFCLXNI-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 229920001577 copolymer Polymers 0.000 description 1
- PYRZPBDTPRQYKG-UHFFFAOYSA-N cyclopentene-1-carboxylic acid Chemical compound OC(=O)C1=CCCC1 PYRZPBDTPRQYKG-UHFFFAOYSA-N 0.000 description 1
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- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 1
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- 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
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
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- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 239000000454 talc Substances 0.000 description 1
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- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
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- 235000010215 titanium dioxide Nutrition 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 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
- PZRXQXJGIQEYOG-UHFFFAOYSA-N zinc;oxido(oxo)borane Chemical compound [Zn+2].[O-]B=O.[O-]B=O PZRXQXJGIQEYOG-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Description
本発明は、ガス輸送鋼管用防食塗料組成物、特に天然ガスや都市ガスを輸送する鋼管の内面に塗装する防食塗料組成物に関する。 The present invention relates to an anticorrosion paint composition for gas transport steel pipes, and more particularly to an anticorrosion paint composition applied to the inner surface of a steel pipe for transporting natural gas or city gas.
天然ガスや都市ガスを輸送する鋼管の内面には、防食塗膜が形成されている。ガス輸送管で輸送されるガス中には、種々の腐食性イオンが高圧で含まれておりそれらが鋼管に到達すると腐食が進行するので、それを防止するために鋼管の内面にエポキシ塗料を塗布している。しかし、腐食性イオンはエポキシ塗膜を透過して、鋼管表面に達して腐食を引き起こす。そのような腐食を防止するために、従来、エポキシ塗料中には鉛系やクロム系の防錆顔料を配合していた。 An anticorrosion coating film is formed on the inner surface of the steel pipe that transports natural gas and city gas. In the gas transported by the gas transport pipe, various corrosive ions are contained at high pressure, and when they reach the steel pipe, the corrosion progresses, so an epoxy paint is applied to the inner surface of the steel pipe to prevent it. is doing. However, corrosive ions permeate the epoxy coating and reach the steel pipe surface to cause corrosion. In order to prevent such corrosion, lead-based and chromium-based rust-preventive pigments have been conventionally incorporated into epoxy paints.
鉛系やクロム系の防錆顔料は、防食効果が高く、有効な防錆剤として利用されてきたが、それらが人体に有害であることが確認されてからはそれら防錆顔料に代わるものを開発する必要が生じてきた。 Lead-based and chromium-based anti-corrosion pigments have a high anti-corrosion effect and have been used as effective anti-corrosion agents. However, after they have been confirmed to be harmful to the human body, alternatives to these anti-corrosion pigments can be used. The need to develop has arisen.
特許文献１（特開平６−１００８０２号公報）には、エポキシなどの熱硬化性樹脂中にホウ酸亜鉛化合物を配合した防食塗料組成物が提案されている。この防食塗料は、特に鋼材に電気防食処理をする場合に起こる陰極剥離を防止する機能は高いが、高圧ガス輸送菅内面の防食性能については、余り高い性能が得られない。 Patent Document 1 (Japanese Patent Laid-Open No. 6-100802) proposes an anticorrosive coating composition in which a zinc borate compound is blended in a thermosetting resin such as epoxy. This anti-corrosion paint has a high function of preventing cathode peeling that occurs particularly when steel material is subjected to an anti-corrosion treatment, but the anti-corrosion performance of the inner surface of the high-pressure gas transport rod is not so high.
本発明は上記従来の問題を解決するものであり、その目的とするところは、ガス輸送鋼管用防食塗料組成物、特に天然ガスや都市ガスを輸送する鋼管の内面に塗装する防食塗料組成物であって、鉛およびクロムの両物質を含まない防食塗料組成物を提供することにある。 The present invention solves the above-mentioned conventional problems, and an object of the present invention is an anticorrosion paint composition for gas transport steel pipes, particularly an anticorrosion paint composition applied to the inner surface of a steel pipe transporting natural gas or city gas. An object of the present invention is to provide an anticorrosion coating composition free of both lead and chromium substances.
本発明は、エポキシ樹脂、硬化剤および防食顔料を含有する、ガス輸送鋼管用防食塗料組成物であって、この防食顔料が、(ｉ)ホウ酸亜鉛化合物および、(ii)リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウム、を含有する、ガス輸送鋼管用防食塗料組成物を提供するものであり、そのことにより上記目的が達成される。 The present invention relates to an anticorrosion coating composition for gas transport steel pipes, which contains an epoxy resin, a curing agent, and an anticorrosion pigment, the anticorrosion pigment comprising (i) a zinc borate compound, and (ii) aluminum phosphomolybdate and The object is achieved by providing an anticorrosive coating composition for gas transport steel pipes, which contains aluminum dihydrogen tripolyphosphate.
上記防食顔料を含む顔料成分が、乾燥塗膜中に含まれる顔料成分の体積百分率が１５〜２０％となる量で塗料組成物中に含有されるのが好ましい。 The pigment component containing the anticorrosive pigment is preferably contained in the coating composition in such an amount that the volume percentage of the pigment component contained in the dry coating film is 15 to 20%.
また、上記防食顔料は、全顔料成分１００重量部に対して５〜４０重量部で含有されるのが好ましい。 The anticorrosive pigment is preferably contained in an amount of 5 to 40 parts by weight with respect to 100 parts by weight of the total pigment component.
本発明のガス輸送鋼管用防食塗料組成物において、防食顔料として(ｉ)ホウ酸亜鉛化合物と(ii)リンモリブデン酸アルミニウムとを使用するのが好ましい。 In the anticorrosive coating composition for gas transport steel pipe of the present invention, it is preferable to use (i) a zinc borate compound and (ii) aluminum phosphomolybdate as anticorrosive pigments.
さらに本発明は、鋼管の内面に上記のガス輸送鋼管用防食塗料組成物からなる塗膜を有するガス輸送鋼管を提供するものである。 Furthermore, this invention provides the gas transport steel pipe which has a coating film which consists of said anticorrosion coating composition for gas transport steel pipes on the inner surface of a steel pipe.
また本発明は、上記ガス輸送鋼管の外面にさらにポリオレフィン被覆を有するガス輸送鋼管を提供するものである。 The present invention also provides a gas transport steel pipe having a polyolefin coating on the outer surface of the gas transport steel pipe.
本明細書中における「顔料成分」とは、着色顔料および体質顔料などの通常使用される顔料と、上記防食顔料とを含む成分をいう。 In the present specification, the “pigment component” refers to a component containing a commonly used pigment such as a colored pigment and an extender pigment and the anticorrosion pigment.
なお本明細書中、乾燥塗膜中に含まれる顔料成分の体積百分率（％）は、「ＰＶＣ」で表わすこともある。 In the present specification, the volume percentage (%) of the pigment component contained in the dry coating film may be represented by “PVC”.
本明細書中「鉛およびクロムの両物質を含まない」とは、防食塗料組成物中に、環境に悪影響を与えるような量で、鉛および鉛化合物が含まれず、かつクロムが含まれないことを意味する。 In this specification, “does not contain both lead and chromium” means that the anticorrosive coating composition does not contain lead and lead compounds and does not contain chromium in such an amount as to adversely affect the environment. Means.
本発明の塗料組成物は、鉛およびクロムの両物質を含まない塗料組成物であるにもかかわらず、鉛含有塗料組成物に匹敵する防食性を、ガス輸送鋼管の内面に付与することができる。従って、本発明によって、安全性の高い防食塗料組成物を提供することができる。また、本発明の塗料組成物を用いることにより、内面の防食性に優れたガス輸送鋼管を得ることができる。 Although the coating composition of the present invention is a coating composition that does not contain both lead and chromium substances, corrosion resistance comparable to that of the lead-containing coating composition can be imparted to the inner surface of the gas transport steel pipe. . Therefore, according to the present invention, a highly safe anticorrosive coating composition can be provided. Further, by using the coating composition of the present invention, it is possible to obtain a gas transport steel pipe excellent in corrosion resistance on the inner surface.
本発明のガス輸送鋼管用防食塗料組成物は、エポキシ樹脂、硬化剤および防食顔料を含有する、ガス輸送鋼管用防食塗料組成物であって、この防食顔料が、(ｉ)ホウ酸亜鉛化合物と、(ii)リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムとを含むものである。 The anticorrosion paint composition for gas transport steel pipe of the present invention is an anticorrosion paint composition for gas transport steel pipe containing an epoxy resin, a curing agent and an anticorrosion pigment, and the anticorrosion pigment comprises (i) a zinc borate compound and (Ii) aluminum phosphomolybdate and / or aluminum dihydrogen tripolyphosphate.
エポキシ樹脂
本発明に好適なエポキシ樹脂は、ビスフェノールＡ、ビスフェノールＦ、ビスフェノールＡＤといった４，４−（ビスヒドロキシフェニル）アルカン類にエピハロヒドリンを作用させて製造される４，４−（ビスヒドロキシフェニル）アルカンのジグリシジルエーテル類である。また、４，４−（ビスヒドロキシフェニル）アルカンのグリシジルエーテルを主成分としてフェノールノボラック型エポキシ樹脂やクレゾールノボラック型エポキシ樹脂を併用してもよい。これら４，４−（ビスヒドロキシフェニル）アルカンの種類に応じて無溶剤型、溶剤型、粉体型などの塗料形態とし、作業性に応じて任意に選択して使用することができる。なお、この種のエポキシ樹脂は、商品名「エピコート」（油化シェルエポキシ(株)社製）、「エポトート」（東都化成(株)社製）、「アラルダイト」（チバガイギー社製）、「エピクロン」（大日本インキ化学工業(株)社製）、「ダウエポキシ」（旭ダウ(株)社製）として市販されている。
Epoxy resin An epoxy resin suitable for the present invention is a 4,4- (bishydroxyphenyl) alkane produced by the action of epihalohydrin on 4,4- (bishydroxyphenyl) alkanes such as bisphenol A, bisphenol F, and bisphenol AD. Of diglycidyl ethers. A phenol novolac type epoxy resin or a cresol novolac type epoxy resin may be used in combination with glycidyl ether of 4,4- (bishydroxyphenyl) alkane as a main component. Depending on the type of these 4,4- (bishydroxyphenyl) alkanes, a paint form such as a solvent-free type, a solvent type, and a powder type can be used, which can be arbitrarily selected according to workability. This type of epoxy resin is available under the trade names “Epicoat” (manufactured by Yuka Shell Epoxy Co., Ltd.), “Epototo” (manufactured by Tohto Kasei Co., Ltd.), “Araldite” (manufactured by Ciba Geigy), “Epicron” "Dai Nippon Ink Chemical Co., Ltd." and "Dow Epoxy" (Asahi Dow Co., Ltd.).
硬化剤
硬化剤は、エポキシ樹脂のエポキシ基に対して付加重合性の官能基を分子内に複数個有する一般のエポキシ硬化剤を用いることができる。使用できる硬化剤として、脂肪族ジアミン、芳香族ジアミン、複素環式ジアミンなどのジアミン類、ポリアミン類およびそれらの各種変性物、これらのジアミン類およびポリアミン類等と脂肪酸およびその２量体とを反応させたポリアミドアミン樹脂、酸無水物、チオール類、フェノール類等が挙げられる。本発明では、好ましくはポリアミドアミン樹脂を使用する。使用できる硬化剤として、例えば「エポメート」（油化シェルエポキシ(株)社製、各種複素環式ジアミン変性物）、「サンマイド」（三和化学工業(株)社製、各種アミンアダクト、ポリアミドアミン樹脂など）、「トーマイド」（富士化成(株)社製、各種ポリアミドアミン）、「エピキュア」（油化シェルエポキシ(株)社製、各種アミンアダクト、チオール類、フェノール類）、「リカシッド」（新日本理科(株)社製、酸無水物）等が挙げられる。また、付加反応型ではなく、付加反応性とエポキシ基間の自己重合触媒能を有するジシアンジアミドやその誘導体、イミダール類を、硬化剤とすることもできる。これら硬化剤は、塗料の形態や硬化条件（常温硬化、加熱硬化）等に応じて適宜に選択使用される。
As the curing agent curing agent, a general epoxy curing agent having a plurality of addition polymerizable functional groups in the molecule with respect to the epoxy group of the epoxy resin can be used. Examples of curing agents that can be used include diamines such as aliphatic diamines, aromatic diamines, and heterocyclic diamines, polyamines and their various modified products, and reaction of these diamines and polyamines with fatty acids and dimers thereof. And polyamidoamine resins, acid anhydrides, thiols, phenols, and the like. In the present invention, a polyamidoamine resin is preferably used. Curing agents that can be used include, for example, “Epomate” (manufactured by Yuka Shell Epoxy Co., Ltd., various heterocyclic diamine modified products), “Sunmide” (manufactured by Sanwa Chemical Industry Co., Ltd., various amine adducts, polyamidoamines) Resin, etc.), “Tomide” (manufactured by Fuji Kasei Co., Ltd., various polyamide amines), “Epicure” (manufactured by Yuka Shell Epoxy Co., Ltd., various amine adducts, thiols, phenols), “Licacid” ( Shin Nippon Science Co., Ltd., acid anhydride). In addition, dicyandiamide, its derivatives, and imidazoles having addition reactivity and self-polymerization catalysis ability between epoxy groups can be used as the curing agent instead of the addition reaction type. These curing agents are appropriately selected and used according to the form of the coating material and the curing conditions (room temperature curing, heat curing) and the like.
本発明の塗料組成物において、エポキシ樹脂および硬化剤の含有量は、好ましくは、エポキシ樹脂のエポキシ当量と硬化剤の活性水素当量との比で１：０．５〜１：２．０となる量であり、より好ましくは１：１〜１：１．５となる量である。硬化剤が、上記当量比の範囲外の量で用いられる場合、硬化性が不十分となり、硬度が弱く、防食性も不十分となる。 In the coating composition of the present invention, the content of the epoxy resin and the curing agent is preferably 1: 0.5 to 1: 2.0 in the ratio of the epoxy equivalent of the epoxy resin to the active hydrogen equivalent of the curing agent. The amount is more preferably 1: 1 to 1: 1.5. When a hardening | curing agent is used in the quantity outside the range of the said equivalent ratio, sclerosis | hardenability will become inadequate, hardness will be weak, and corrosion resistance will also become inadequate.
本発明の塗料組成物ではエポキシ樹脂および硬化剤を樹脂成分として含むが、必要に応じて、エポキシ樹脂および硬化剤以外の樹脂を樹脂成分として含んでもよい。このような樹脂として、例えばアクリル樹脂、ウレタン樹脂、オレフィン樹脂、アルキッド樹脂、フェノキシ樹脂、石油樹脂等が挙げられる。 In the coating composition of the present invention, an epoxy resin and a curing agent are included as a resin component, but a resin other than the epoxy resin and the curing agent may be included as a resin component as necessary. Examples of such resins include acrylic resins, urethane resins, olefin resins, alkyd resins, phenoxy resins, and petroleum resins.
防食顔料
本発明の塗料組成物は、防食顔料として(ｉ)ホウ酸亜鉛化合物と、(ii)リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムとを含有する。(ｉ)ホウ酸亜鉛化合物として、メタホウ酸亜鉛（Ｚｎ(ＢＯ2)2）、塩基性ホウ酸亜鉛（ＺｎＢ4Ｏ7・２ＺｎＯ）またはホウ酸亜鉛（２ＺｎＯ・３Ｂ2Ｏ3・３.５Ｈ2Ｏ）の１種もしくは２種以上の混合物を使用することができる。本発明では(ｉ)ホウ酸亜鉛化合物としてホウ酸亜鉛を使用するのが好ましい。ホウ酸亜鉛は、酸化亜鉛とホウ酸の混合原料を溶融する方法や混合原料の水溶液を複分解する方法によって得ることができる。
Anticorrosion Pigment The coating composition of the present invention contains (i) a zinc borate compound and (ii) aluminum phosphomolybdate and / or aluminum dihydrogen phosphate as anticorrosion pigments. (i) As a zinc borate compound, zinc metaborate (Zn (BO 2 ) 2 ), basic zinc borate (ZnB 4 O 7 .2ZnO) or zinc borate (2ZnO.3B 2 O 3 .3.5H 2) One or a mixture of two or more of O) can be used. In the present invention, it is preferable to use zinc borate as the (i) zinc borate compound. Zinc borate can be obtained by a method of melting a mixed raw material of zinc oxide and boric acid or a method of metathesis of an aqueous solution of the mixed raw material.
防食顔料として、(ｉ)ホウ酸亜鉛化合物に加えて、(ii)リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムが含まれる。ホウ酸亜鉛化合物と、リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムとを併用することにより、防食性に優れた、鉛およびクロムの両物質を含まない塗料組成物を得ることができる。防食顔料として(ｉ)ホウ酸亜鉛化合物と(ii)リンモリブデン酸アルミニウムとが含まれるのが好ましい。良好な防食性を有するガス輸送鋼管用の塗料組成物を得ることができるからである。上記化合物は市販されているものを使用することができる。例えば、リンモリブデン酸アルミニウムとして「ＬＦボウセイ」（キクチカラー(株)社製）が市販されており、これらを使用することができる。 Anticorrosive pigments include (ii) aluminum phosphomolybdate and / or aluminum dihydrogen triphosphate in addition to (i) a zinc borate compound. By using a zinc borate compound in combination with aluminum phosphomolybdate and / or aluminum dihydrogen tripolyphosphate, it is possible to obtain a coating composition that is excellent in corrosion resistance and does not contain both lead and chromium substances. The anticorrosive pigment preferably contains (i) a zinc borate compound and (ii) aluminum phosphomolybdate. This is because it is possible to obtain a coating composition for gas transport steel pipes having good corrosion resistance. The said compound can use what is marketed. For example, “LF Bowsey” (manufactured by Kikuchi Color Co., Ltd.) is commercially available as aluminum phosphomolybdate, and these can be used.
防食顔料は、本発明の塗料組成物中、全顔料成分１００重量部に対して５〜４０固形分重量部、好ましくは１０〜２０固形分重量部で含有される。防食顔料が５固形分重量部未満では防食効果が有効に発現せず、４０固形分重量部を超えると溶出成分が多すぎて耐水性が低下することとなり実用に好ましくない。 The anticorrosive pigment is contained in the coating composition of the present invention in an amount of 5 to 40 solid parts by weight, preferably 10 to 20 solid parts by weight, based on 100 parts by weight of all pigment components. When the anticorrosive pigment is less than 5 solid parts by weight, the anticorrosive effect is not effectively exhibited. When the anticorrosive pigment exceeds 40 solids by weight, the amount of eluted components is too much and the water resistance is lowered, which is not preferable for practical use.
本発明の塗料組成物において、防食顔料に含まれる(ｉ)ホウ酸亜鉛化合物と、(ii)リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウム、との重量比は、好ましくは、(ｉ)１重量部に対して(ii)１．５〜２．０重量部である。(ii)が上記重量比１：１．５より少ない量で含まれると、防食効果が有効に発揮されず、(ii)が上記重量比１：２．０を超える量で含まれると、耐水性が低下することとなる。 In the coating composition of the present invention, the weight ratio of (i) zinc borate compound and (ii) aluminum phosphomolybdate and / or aluminum dihydrogen tripolyphosphate contained in the anticorrosive pigment is preferably (i) (Ii) 1.5 to 2.0 parts by weight with respect to 1 part by weight. When (ii) is contained in an amount less than the above weight ratio 1: 1.5, the anticorrosive effect is not effectively exhibited, and when (ii) is contained in an amount exceeding the above weight ratio 1: 2.0, water resistance The performance will be reduced.
顔料
本発明の塗料組成物には通常用いられる顔料を含有させてもよい。但し、本明細書でいう「顔料」には、前述の防食顔料は含まれない。使用し得る顔料の例としては、チタンホワイト、カーボンブラック及びベンガラのような着色顔料；カオリン、タルク、ケイ酸アルミニウム、炭酸カルシウム、シリカ、マイカおよびクレーのような体質顔料等が挙げられる。
Pigment The paint composition of the present invention may contain a commonly used pigment. However, the above-mentioned anticorrosion pigment is not included in the “pigment” in the present specification. Examples of pigments that can be used include colored pigments such as titanium white, carbon black and bengara; extender pigments such as kaolin, talc, aluminum silicate, calcium carbonate, silica, mica and clay.
本発明の塗料組成物において、上記樹脂成分に対して、(ｉ)および(ii)を含む防食顔料、ならびに上記顔料（着色顔料および体質顔料等）を含む成分を、顔料成分という。そして、本発明の塗料組成物では、この顔料成分が、本発明の塗料組成物より得られる乾燥塗膜中に含まれる顔料成分の体積百分率（ＰＶＣ）で、好ましくは１５〜２０％となる量で塗料組成物中に含まれる。上記顔料成分がＰＶＣで１５％より少なくなる量で塗料組成物中に含まれると、得られる塗膜が脆弱となるため実用に好ましくなく、ＰＶＣで２０％を超える量で塗料組成物中に含まれると、耐アルカリ性が低下する。 In the coating composition of the present invention, an anticorrosive pigment containing (i) and (ii) and a component containing the above pigment (colored pigment, extender pigment, etc.) are referred to as a pigment component. And in the coating composition of this invention, this pigment component is the volume percentage (PVC) of the pigment component contained in the dry coating film obtained from the coating composition of this invention, Preferably the quantity used as 15-20% In the coating composition. If the above pigment component is contained in the coating composition in an amount of less than 15% by PVC, the resulting coating film becomes brittle, which is not preferred for practical use, and contained in the coating composition in an amount exceeding 20% by PVC. If this is done, the alkali resistance decreases.
本発明の塗料組成物は、上記した樹脂成分、防食顔料、顔料のほか、必要に応じて有機溶剤、表面調整剤等の当分野において公知の他の成分を添加することができる。本発明の塗料組成物の固形分濃度は１０〜１００％で使用する。 In addition to the resin component, anticorrosive pigment, and pigment described above, the coating composition of the present invention may contain other components known in the art such as an organic solvent and a surface conditioner, if necessary. The solid content concentration of the coating composition of the present invention is 10 to 100%.
本発明の塗料組成物は、通常の塗料組成物の製造で用いられる一般的な製造方法を用いて製造することができる。すなわち、本発明の塗料組成物を液状無溶剤型塗料とする場合には、エポキシ樹脂に所定量の硬化剤、防食顔料および顔料等を加え、ロールミル、ディゾルバー等で分散処理することにより製造することができる。本発明の塗料組成物を有機溶剤型塗料とする場合にはロールミル、ディゾルバー、ＳＧミル、ポットミル等で分散処理することにより製造することができる。本発明の塗料組成物を粉体塗料とする場合には、エポキシ樹脂に所定量の硬化剤、防食顔料および顔料等を加え、予備混合したのち加熱混練し、冷却後に粉砕、分級することにより製造することができる。 The coating composition of this invention can be manufactured using the general manufacturing method used by manufacture of a normal coating composition. That is, when the coating composition of the present invention is a liquid solvent-free coating, it is manufactured by adding a predetermined amount of a curing agent, anticorrosive pigment, pigment, etc. to an epoxy resin and dispersing the mixture with a roll mill, dissolver, or the like. Can do. When the coating composition of the present invention is an organic solvent-type coating, it can be produced by a dispersion treatment using a roll mill, dissolver, SG mill, pot mill or the like. When the coating composition of the present invention is a powder coating, it is manufactured by adding a predetermined amount of curing agent, anticorrosive pigment, pigment, etc. to an epoxy resin, premixing, heating and kneading, pulverizing and classifying after cooling. can do.
本発明による防食塗料組成物を塗布するには、刷毛、ローラー、エアレススプレー、エアスプレー、粉体塗装機などを塗料の形態に合わせて選定し、常法に従って塗装される。塗装後の塗膜面には、ポリエチレンライニング、重防食ウレタン被覆、エポキシ樹脂塗料などの重防食塗膜や着色、美装のための上塗り層を形成してもよい。 In order to apply the anticorrosion coating composition according to the present invention, a brush, a roller, an airless spray, an air spray, a powder coating machine, or the like is selected according to the form of the coating and is applied according to a conventional method. On the coated film surface after coating, a heavy anticorrosive film such as polyethylene lining, heavy anticorrosive urethane coating, epoxy resin paint, and a top coat layer for coloring and beautifying may be formed.
ガス輸送鋼管
上記した本発明の塗料組成物をガス輸送鋼管の内面に塗装することにより、鋼管の内面に防食性が付与されたガス輸送鋼管を提供することができる。防食性が付与される鋼管を構成する鋼材として、例えば炭素鋼、またはステンレス鋼等の合金鋼など、ラインパイプ等での使用に有用な鋼材が挙げられる。ガス輸送鋼管は、本発明の塗料組成物を塗装する前に、必要に応じて、公知の表面処理方法（例えば、ショットブラスト処理、グリッドブラスト処理、サンドブラスト処理等の物理的手段、または酸洗、アルカリ脱脂等の化学的手段、あるいはそれらの組み合わせ）を用いて表面を清浄化されていることが好ましい。ガス輸送鋼管の表面に、防食性の観点から、一般に密着性や防食性を高めるための下地処理として公知の化成処理（例えば、リン酸塩処理、クロメート処理、クロム酸処理など）が施されていているものも好ましい。化成処理とは、化学的または電気化学的処理により、金属である鋼材表面に非金属の皮膜を沈積させる処理法をいう。このような皮膜を沈積させる化合物としては、例えばリン酸塩、クロム酸塩、塩基性塩、酸化物、硫化物などが挙げられる。
Gas transport steel pipe By coating the above-described coating composition of the present invention on the inner surface of a gas transport steel pipe, a gas transport steel pipe having corrosion resistance imparted to the inner surface of the steel pipe can be provided. Examples of the steel material constituting the steel pipe to which corrosion resistance is imparted include steel materials useful for use in line pipes, such as carbon steel or alloy steel such as stainless steel. Before applying the coating composition of the present invention, the gas transport steel pipe may be a known surface treatment method (for example, physical means such as shot blast treatment, grid blast treatment, sand blast treatment, or pickling, The surface is preferably cleaned using chemical means such as alkaline degreasing or a combination thereof. From the viewpoint of corrosion resistance, the surface of the gas transport steel pipe is generally subjected to a known chemical conversion treatment (for example, phosphate treatment, chromate treatment, chromic acid treatment, etc.) as a base treatment for improving adhesion and corrosion resistance. Those that are also preferred. The chemical conversion treatment refers to a treatment method in which a non-metallic film is deposited on the surface of steel, which is a metal, by chemical or electrochemical treatment. Examples of the compound for depositing such a film include phosphate, chromate, basic salt, oxide, sulfide and the like.
上記した本発明の塗料組成物をガス輸送鋼管の内面に塗装する方法として、鋼管の表面に、スプレー塗装またはしごき塗り等の通常使用される塗装方法を用いることができる。塗装後、加熱して乾燥および硬化させることにより防食塗膜を形成する。本発明の塗料組成物から得られる乾燥させた塗膜の膜厚は、好ましくは１０μｍ〜１００μｍ、より好ましくは３０〜１００μｍである。膜厚が１０μｍ未満では、剥離が生じやすく、防食機能が十分に発現できない。また、膜厚が１００μｍを超えると衝撃耐性が低下することがある。 As a method of coating the above-described coating composition of the present invention on the inner surface of a gas transport steel pipe, a commonly used coating method such as spray coating or ironing can be used on the surface of the steel pipe. After coating, the coating is heated and dried and cured to form an anticorrosion coating. The film thickness of the dried coating film obtained from the coating composition of the present invention is preferably 10 μm to 100 μm, more preferably 30 to 100 μm. When the film thickness is less than 10 μm, peeling is likely to occur, and the anticorrosion function cannot be sufficiently exhibited. Further, when the film thickness exceeds 100 μm, the impact resistance may be lowered.
埋設などのパイプラインの敷設環境に応じて、鋼管の外面に防食性を付与することができる。鋼管の外面に防食性を付与する方法として、例えば鋼管の外面にポリオレフィン被覆を設ける方法、またはエポキシ樹脂塗装を行なう方法などが挙げられる。上記のポリオレフィン被覆は、鋼管の外面にポリオレフィンライニングを施すことにより設けることができる。このポリオレフィン被覆を形成するのに使用するポリオレフィン樹脂は、鋼材の被覆に一般に用いられている任意のポリオレフィンを使用することができる。例えば、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン等、およびエチレンと少量の他のオレフィンもしくはビニルモノマー（例えば、プロピレン、酢酸ビニル、アクリル酸エステル等）との共重合体が挙げられる。これらは単独でまたは混合して用いてよい。前記被覆用ポリオレフィン樹脂には、防食塗膜に通常使用される酸化防止剤、紫外線吸収剤、顔料、充填剤等を添加してもよい。特に、酸化防止剤や紫外線吸収剤をポリオレフィン樹脂に添加することにより、得られるポリオレフィン被覆の耐久性を向上させることができる。また、ポリオレフィン被覆に、当該分野において公知の着色顔料を好ましくは５重量部以下の量で添加することもできる。これらのポリオレフィン樹脂を用いて、公知の方法（例えば、溶融丸ダイ共押出法または溶融Ｔダイ押出法）により、厚さ１〜６ｍｍのポリオレフィン被覆を、防食塗膜が形成されたガス輸送鋼管の外面上に形成することができる。 Corrosion protection can be imparted to the outer surface of the steel pipe according to the laying environment of the pipeline such as burial. Examples of a method for imparting corrosion resistance to the outer surface of the steel pipe include a method of providing a polyolefin coating on the outer surface of the steel pipe or a method of performing epoxy resin coating. The polyolefin coating can be provided by applying a polyolefin lining to the outer surface of the steel pipe. As the polyolefin resin used to form the polyolefin coating, any polyolefin generally used for coating a steel material can be used. For example, low density polyethylene, medium density polyethylene, high density polyethylene, and the like, and copolymers of ethylene and a small amount of other olefins or vinyl monomers (for example, propylene, vinyl acetate, acrylate esters, etc.) can be mentioned. These may be used alone or in combination. To the polyolefin resin for coating, an antioxidant, an ultraviolet absorber, a pigment, a filler and the like that are usually used for anticorrosion coatings may be added. In particular, the durability of the resulting polyolefin coating can be improved by adding an antioxidant or an ultraviolet absorber to the polyolefin resin. Also, a color pigment known in the art can be added to the polyolefin coating, preferably in an amount of 5 parts by weight or less. Using these polyolefin resins, a polyolefin coating having a thickness of 1 to 6 mm is formed by a known method (for example, a melt round die co-extrusion method or a melt T die extrusion method). It can be formed on the outer surface.
鋼管の外面にエポキシ樹脂塗装を行なう場合は、通常用いられる液状エポキシ樹脂塗料または粉体エポキシ樹脂塗料などを用いることができる。前記ポリオレフィン被膜を鋼管の外面に設ける前に、鋼管の外面にエポキシ樹脂塗装を行なうことができる。また、鋼管の外面にこのようなエポキシ樹脂塗装のみを行なうこともできる。 When epoxy resin coating is performed on the outer surface of the steel pipe, a commonly used liquid epoxy resin paint or powder epoxy resin paint can be used. Before the polyolefin coating is provided on the outer surface of the steel pipe, the outer surface of the steel pipe can be coated with an epoxy resin. Moreover, only such epoxy resin coating can be performed on the outer surface of the steel pipe.
また、前記ポリオレフィン被覆を設ける前に、必要に応じて変性ポリオレフィン接着樹脂層を設けることができる。この変性ポリオレフィン接着樹脂層を設けることにより、鋼管とポリオレフィン被覆との、または樹脂塗装の塗膜とポリオレフィン被膜との間の密着性を高めることができる。このような変性ポリオレフィン接着樹脂として、例えば、ポリオレフィン樹脂を、マレイン酸もしくはアクリル酸等の不飽和カルボン酸またはこれらの無水物で変性して接着性を付与した無水マレイン酸もしくはカルボン酸変性ポリオレフィン樹脂、またはエチレン／メタクリル酸共重合体が挙げられる。特に、無水マレイン酸変性ポリオレフィン樹脂は、高い接着性を示すことから、この目的を達成する観点から好ましい。このような無水マレイン酸変性ポリオレフィン樹脂として、例えば、三井化学製接着性ポリオレフィン、製品名「アドマー(ADMER)」などが使用できる。必要に応じて設けられる変性ポリオレフィン接着樹脂層の厚さは、一般に０．１〜０．５ｍｍであるが、この範囲に特に限定されるものではない。 Further, a modified polyolefin adhesive resin layer can be provided as necessary before providing the polyolefin coating. By providing this modified polyolefin adhesive resin layer, the adhesion between the steel pipe and the polyolefin coating or between the resin-coated coating film and the polyolefin coating can be enhanced. As such a modified polyolefin adhesive resin, for example, a maleic anhydride or carboxylic acid modified polyolefin resin obtained by modifying a polyolefin resin with an unsaturated carboxylic acid such as maleic acid or acrylic acid or an anhydride thereof to give adhesion, Or an ethylene / methacrylic acid copolymer is mentioned. In particular, maleic anhydride-modified polyolefin resin is preferable from the viewpoint of achieving this object because it exhibits high adhesiveness. As such maleic anhydride-modified polyolefin resin, for example, Mitsui Chemicals adhesive polyolefin, product name “ADMER”, etc. can be used. The thickness of the modified polyolefin adhesive resin layer provided as necessary is generally 0.1 to 0.5 mm, but is not particularly limited to this range.
本発明の防食性鋼管には、必要に応じて、上記の外面のポリオレフィン被覆上に、更に上塗り層を、当該分野において通常使用される方法により形成してもよい。このような上塗り層として、例えば粉体エポキシ塗装による塗膜が挙げられる。 In the anticorrosion steel pipe of the present invention, if necessary, an overcoat layer may be further formed on the polyolefin coating on the outer surface by a method usually used in the art. As such an overcoat layer, for example, a coating film by powder epoxy coating can be mentioned.
以下に実施例を用いて本発明を説明するが、本発明は以下の実施例に限定されるものではない。ことわりのない限り各例中の「部」は「重量部」を表し、「％」は「重量％」を表す。 The present invention will be described below with reference to examples, but the present invention is not limited to the following examples. Unless otherwise specified, “part” in each example represents “part by weight” and “%” represents “% by weight”.
実施例１〜６、比較例１〜７
硬化剤（ポリアミドアミン樹脂、活性水素当量１６８：商品名サンマイド、三和化学工業(株)社製）、防食顔料および顔料それぞれを、表１、表２に記載の重量部で加えた。次いで、サンドグランドミルで１５００ｒｐｍ、２０分間分散処理し、次いで４００メッシュの金網で濾過した。得られた分散物に、エポキシ樹脂（ビスフェノールＡ型エポキシ樹脂、エポキシ当量４７５：商品名エポトートＹＤ−０１１、東都化成(株)社製）を表１、表２に記載の重量部で加えて混合し、防食塗料組成物を調製した。
Examples 1-6, Comparative Examples 1-7
A curing agent (polyamideamine resin, active hydrogen equivalent 168: trade name Sanmide, manufactured by Sanwa Chemical Industry Co., Ltd.), an anticorrosive pigment, and a pigment were added in parts by weight shown in Tables 1 and 2, respectively. Subsequently, it was dispersed at 1500 rpm for 20 minutes with a sand ground mill, and then filtered through a 400 mesh wire mesh. An epoxy resin (bisphenol A type epoxy resin, epoxy equivalent 475: trade name Epototo YD-011, manufactured by Tohto Kasei Co., Ltd.) is added to the obtained dispersion in parts by weight shown in Tables 1 and 2, and mixed. Thus, an anticorrosion coating composition was prepared.
上記表１および表２中の各符号は、以下の意味を表わす。
ａ：ホウ酸亜鉛
ｂ：リンモリブデン酸アルミニウム、ＬＦボウセイ
（キクチカラー(株)社製）
ｃ：トリポリリン酸アルミニウム、Ｋホワイト
（テイカ(株)社製）
ｄ：リン酸亜鉛、ＬＦボウセイ
（キクチカラー(株)社製）
ｅ：亜リン酸亜鉛カルシウム、Ｅｘｐｅｒｔ
（東邦顔料(株)社製）
ｆ：亜リン酸亜鉛アルミニウム、Ｅｘｐｅｒｔ
（東邦顔料(株)社製）
ｇ：塩基性硫酸鉛、エンリュウＮ（キクチカラー(株)社製）
ｈ：沈降性硫酸バリウム
ｉ：三菱カーボンブラック、ＭＡ１００（三菱化学(株)社製）
ｊ：乾燥塗膜中に含まれる防食顔料および顔料の体積百分率
ｋ：硬化剤の活性水素当量／エポキシ樹脂のエポキシ当量、を示す当量比
Each code | symbol in the said Table 1 and Table 2 represents the following meaning.
a: zinc borate b: aluminum phosphomolybdate, LF bowsey (manufactured by Kikuchi Color Co., Ltd.)
c: Aluminum tripolyphosphate, K white (manufactured by Teika)
d: Zinc phosphate, LF bowsey (manufactured by Kikuchi Color Co., Ltd.)
e: Zinc calcium phosphite, Expert
(Toho Pigment Co., Ltd.)
f: Zinc aluminum phosphite, Expert
(Toho Pigment Co., Ltd.)
g: Basic lead sulfate, Enryu N (manufactured by Kikuchi Color Co., Ltd.)
h: precipitated barium sulfate i: Mitsubishi carbon black, MA100 (manufactured by Mitsubishi Chemical Corporation)
j: anticorrosion pigment contained in the dried coating film and volume percentage of pigment k: equivalent ratio indicating active hydrogen equivalent of curing agent / epoxy equivalent of epoxy resin
評価方法
試験材Ａの作成
幅７０ｍｍ、長さ１５０ｍｍ、厚さ１．６ｍｍの鋼板（ＳＳ−４００）をサンドブラストし、その後キシレンを用いて脱脂した。この鋼板に、実施例１〜６、比較例１〜７で得られた塗料組成物を、エアスプレーを用いて、乾燥膜厚が４０〜６０μｍとなるように塗布した。５０℃で１時間乾燥させた後、室温で７日間放置し、試験材Ａとした。
Evaluation methods
A steel sheet (SS-400) having a width of 70 mm, a length of 150 mm, and a thickness of 1.6 mm was prepared by sandblasting and then degreased using xylene. The coating compositions obtained in Examples 1 to 6 and Comparative Examples 1 to 7 were applied to this steel sheet using air spray so that the dry film thickness was 40 to 60 μm. After drying at 50 ° C. for 1 hour, the sample was left at room temperature for 7 days to obtain Test Material A.
試験材Ｂの作成
幅７０ｍｍ、長さ１５０ｍｍ、厚さ０．８ｍｍの鋼板（ＪＩＳ Ｇ３１４１）を＃１８０の研磨紙で研磨し、その後キシレンを用いて脱脂した。この鋼板に、実施例１〜６、比較例１〜７で得られた塗料組成物を、エアスプレーを用いて、乾燥膜厚が４０〜６０μｍとなるように塗布した。５０℃で１時間乾燥させた後、室温で７日間放置し、試験材Ｂとした。
A steel sheet (JIS G3141) having a width of 70 mm, a length of 150 mm, and a thickness of 0.8 mm was prepared by polishing a # 180 abrasive paper, and then degreased using xylene. The coating compositions obtained in Examples 1 to 6 and Comparative Examples 1 to 7 were applied to this steel sheet using air spray so that the dry film thickness was 40 to 60 μm. After drying at 50 ° C. for 1 hour, it was left at room temperature for 7 days to obtain Test Material B.
耐塩水噴霧性試験
ＪＩＳ Ｋ ５６００ ７−１に準拠して、耐塩水噴霧性試験を行なった。試験材Ａ全体にクロスカットを入れて行なった。判定は以下の基準で行なった。
クロスカット部分から生じた錆または膨れの幅が３ｍｍ以内：○
クロスカット部分から生じた錆または膨れの幅が３ｍｍ以上：×
Salt spray resistance test A salt spray resistance test was performed according to JIS K 56007-1. The entire test material A was subjected to a cross cut. The determination was made according to the following criteria.
The width of the rust or blister generated from the cross cut portion is within 3 mm: ○
The width of the rust or blister generated from the cross cut portion is 3 mm or more: ×
耐酸性試験
ＪＩＳ Ｋ ５６００ ６−１に準拠して、耐酸性試験を行なった。試験材Ｂを、５％塩酸水溶液中に２３℃で３０日間浸漬した。塗膜状態を目視評価した。判定は以下の基準で行なった。
錆、膨れ、剥がれ等が生じていない：○
錆、膨れ、剥がれ等が生じている ：×
Acid resistance test An acid resistance test was conducted according to JIS K 5600 6-1. Test material B was immersed in a 5% aqueous hydrochloric acid solution at 23 ° C. for 30 days. The coating state was visually evaluated. The determination was made according to the following criteria.
No rust, swelling, peeling, etc .: ○
Rust, swelling, peeling, etc. have occurred: ×
耐アルカリ性試験
ＪＩＳ Ｋ ５６００ ６−１に準拠して、耐酸性試験を行なった。試験材Ｂを、５％水酸化ナトリウム水溶液中に２３℃で３０日間浸漬した。塗膜状態を目視評価した。判定は以下の基準で行なった。
錆、膨れ、剥がれ等が生じていない：○
錆、膨れ、剥がれ等が生じている ：×
Alkali resistance test An acid resistance test was conducted according to JIS K 5600 6-1. Test material B was immersed in a 5% aqueous sodium hydroxide solution at 23 ° C. for 30 days. The coating state was visually evaluated. The determination was made according to the following criteria.
No rust, swelling, peeling, etc .: ○
Rust, swelling, peeling, etc. have occurred: ×
上記試験の結果を表１、表２に示す。これらの結果より、本発明の塗料組成物は、鉛およびクロムの両物質を含まない塗料組成物であるにもかかわらず、鉛含有塗料組成物に匹敵する防食性を付与できることがわかる。
The results of the above test are shown in Tables 1 and 2. From these results, it can be seen that the coating composition of the present invention can provide corrosion resistance comparable to that of the lead-containing coating composition, despite being a coating composition that does not contain both lead and chromium substances.
Claims (5)
該防食顔料が、（ｉ）ホウ酸亜鉛化合物と、（ｉｉ）リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムとを含有し、
（ｉ）ホウ酸亜鉛化合物と、（ｉｉ）リンモリブデン酸アルミニウムおよび／またはトリポリリン酸二水素アルミニウムとの重量比が、（ｉ）１重量部に対して、（ｉｉ）１．５〜２．０重量部であり、
該防食顔料は、塗料組成物中の全顔料成分１００重量部に対して５〜４０重量部で含有され、および
該防食顔料を含む顔料成分が、乾燥塗膜中に含まれる顔料成分の体積百分率が１５〜２０％となる量で、塗料組成物中に含有される、ガス輸送鋼管用防食塗料組成物。 An anticorrosive coating composition for a gas transport steel pipe, comprising an epoxy resin, a curing agent and an anticorrosive pigment,
The anticorrosive pigment contains (i) a zinc borate compound and (ii) aluminum phosphomolybdate and / or aluminum dihydrogen tripolyphosphate,
The weight ratio of (i) zinc borate compound to (ii) aluminum phosphomolybdate and / or aluminum dihydrogen tripolyphosphate is (ii) from 1.5 parts by weight to 1 part by weight. Parts by weight,
The anticorrosive pigment is contained in an amount of 5 to 40 parts by weight based on 100 parts by weight of the total pigment component in the coating composition, and the pigment component containing the anticorrosive pigment is a volume percentage of the pigment component contained in the dry coating film. Is an anticorrosive coating composition for gas transport steel pipe, which is contained in the coating composition in an amount of 15 to 20%.
前記硬化剤が、脂肪族ジアミン、芳香族ジアミンおよび複素環式ジアミンからなる群から選択されるジアミン類；ポリアミン類；およびそれらの変性物；ならびに該ジアミン類またはポリアミン類と、脂肪酸もしくはその２量体とを反応させたポリアミドアミン樹脂；酸無水物；チオール類；およびフェノール類からなる群から少なくとも１つ選択され、
ガス輸送鋼管の内面に塗装されることを特徴とする、請求項１記載のガス輸送鋼管用防食塗料組成物。 Diglycidyl ethers of 4,4- (bishydroxyphenyl) alkanes, wherein the epoxy resin is prepared by reacting epihalohydrin with 4,4- (bishydroxyphenyl) alkanes; and 4,4- (bishydroxyphenyl) ) At least one selected from the group consisting of phenol novolac epoxy resins and cresol novolac epoxy resins based on glycidyl ethers of alkanes;
The curing agent is selected from the group consisting of aliphatic diamines, aromatic diamines and heterocyclic diamines; polyamines; and their modified products; and the diamines or polyamines and fatty acids or their two amounts. At least one selected from the group consisting of a polyamidoamine resin reacted with a body; an acid anhydride; a thiol; and a phenol;
2. The anticorrosion coating composition for gas transport steel pipes according to claim 1, which is coated on the inner surface of the gas transport steel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003328353A JP4560284B2 (en) | 2003-04-15 | 2003-09-19 | Anticorrosion coating composition for gas transport steel pipe and gas transport steel pipe |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003110549 | 2003-04-15 | ||
| JP2003328353A JP4560284B2 (en) | 2003-04-15 | 2003-09-19 | Anticorrosion coating composition for gas transport steel pipe and gas transport steel pipe |
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| JP4560284B2 true JP4560284B2 (en) | 2010-10-13 |
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| CN106800861B (en) * | 2016-12-27 | 2019-04-19 | 天津灯塔涂料工业发展有限公司 | A kind of Chrome-free high solid bi-component epoxy priming paint and preparation method thereof |
| WO2023013482A1 (en) * | 2021-08-04 | 2023-02-09 | 日本ペイント・サーフケミカルズ株式会社 | Steel pipe and method for coating steel pipe |
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