CN117659818A - Straight-seam pipeline steel pipe and preparation process thereof - Google Patents
Straight-seam pipeline steel pipe and preparation process thereof Download PDFInfo
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- CN117659818A CN117659818A CN202311683368.8A CN202311683368A CN117659818A CN 117659818 A CN117659818 A CN 117659818A CN 202311683368 A CN202311683368 A CN 202311683368A CN 117659818 A CN117659818 A CN 117659818A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000003973 paint Substances 0.000 claims abstract description 86
- 238000005260 corrosion Methods 0.000 claims abstract description 59
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 239000004593 Epoxy Substances 0.000 claims abstract description 28
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims abstract description 22
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 21
- 239000011701 zinc Substances 0.000 claims abstract description 21
- 229920002197 Sodium polyaspartate Polymers 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 44
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 8
- 125000001931 aliphatic group Chemical group 0.000 claims description 7
- 125000003277 amino group Chemical group 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 4
- 239000012954 diazonium Substances 0.000 claims description 4
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 4
- HVBSAKJJOYLTQU-UHFFFAOYSA-M 4-aminobenzenesulfonate Chemical compound NC1=CC=C(S([O-])(=O)=O)C=C1 HVBSAKJJOYLTQU-UHFFFAOYSA-M 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-O diazynium Chemical compound [NH+]#N IJGRMHOSHXDMSA-UHFFFAOYSA-O 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 25
- 239000000853 adhesive Substances 0.000 abstract description 12
- 230000001070 adhesive effect Effects 0.000 abstract description 12
- 230000000052 comparative effect Effects 0.000 description 20
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- 238000001514 detection method Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003518 caustics Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
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- 229910052751 metal Inorganic materials 0.000 description 3
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- 229910000077 silane Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229920000805 Polyaspartic acid Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- 229910021389 graphene Inorganic materials 0.000 description 2
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- 239000003345 natural gas Substances 0.000 description 2
- 108010064470 polyaspartate Proteins 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical group CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 241000251133 Sphyrna tiburo Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- VREFGVBLTWBCJP-UHFFFAOYSA-N alprazolam Chemical compound C12=CC(Cl)=CC=C2N2C(C)=NN=C2CN=C1C1=CC=CC=C1 VREFGVBLTWBCJP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical group 0.000 description 1
- -1 aminobenzenesulfonic acid diazonium salt Chemical class 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of steel pipe manufacturing, and particularly discloses a straight-seam pipeline steel pipe and a preparation process thereof. The straight seam pipeline steel pipe comprises a steel pipe body and an anti-corrosion paint film covered on the surface of the steel pipe body, wherein the anti-corrosion paint film comprises a primer layer, a middle paint layer and a top paint layer, the primer layer is obtained after a composite primer is cured, and the components of the composite primer comprise a water-based epoxy zinc-rich primer, silica sol, sodium polyaspartate and cerium nitrate. The anti-corrosion paint film has strong adhesive force, so that the anti-corrosion paint film has strong resistance effect on external impact, is not easy to fall off when being impacted by external force, and can realize good anti-corrosion effect.
Description
Technical Field
The application relates to the technical field of steel pipe manufacturing, in particular to a straight-seam pipeline steel pipe and a preparation process thereof.
Background
At present, in long-distance transportation of petroleum and natural gas, pipelines play an important role. Because the pipelines laid in long distances are mostly in service in outdoor environments, the pipelines have higher requirements on corrosion resistance. For pipelines, the common corrosion-resistant protection means mainly comprises the step of covering the surface with an anti-corrosion paint film so as to isolate the steel pipe body from the external corrosion environment. For the anti-corrosion paint film, no matter how good the anti-corrosion performance is, once falling off occurs, the anti-corrosion effect is lost, so that the anti-corrosion paint film needs to have good combination performance with the steel pipe body.
Chinese patent publication No. CN101474644A discloses a straight-seam pipeline steel pipe, through the preference of welding process and operating parameter, can make the height of inside and outside welding seam and parent metal pipe wall unanimous, be favorable to anticorrosive paint film and parent metal pipe wall fully laminating for this kind of steel pipe is better in theory than traditional straight-seam pipeline steel pipe is applicable to the transportation of industrial raw materials such as oil, natural gas, powdered ore.
With respect to the related art, the inventor believes that even though the straight-seam pipeline steel pipe in the related art is favorable for fully attaching the anti-corrosion paint film to the wall of the base metal pipe, the adhesive force of the anti-corrosion paint film on the surface of the steel pipe is still limited at present, the steel pipe is inevitably impacted by external force in the transportation and installation processes, and when the impact force on the steel pipe is concentrated, the anti-corrosion paint film on the surface of the steel pipe is easy to fall off locally, so that the service life of the steel pipe is influenced.
Disclosure of Invention
When the impact force applied to the steel pipe is concentrated, the anti-corrosion paint film coated on the surface of the steel pipe in the related technology is easy to fall off locally, and the service life of the steel pipe is influenced. To improve this defect, the present application provides a straight-seam pipeline steel pipe and a preparation process thereof.
In a first aspect, the present application provides a straight-seam pipeline steel pipe, which adopts the following technical scheme:
the straight-seam pipeline steel pipe comprises a steel pipe body and an anti-corrosion paint film covered on the surface of the steel pipe body, wherein the anti-corrosion paint film comprises a primer layer, a middle paint layer and a top paint layer, the primer layer is obtained after a composite primer is cured, and the composite primer comprises the following components in parts by weight: 100-108 parts of water-based epoxy zinc-rich primer, 24-36 parts of silica sol, 1.4-1.8 parts of sodium polyaspartate and 0.4-1.8 parts of cerium nitrate, wherein the weight average molecular weight of the sodium polyaspartate is 1800-5700.
By adopting the technical scheme, the application provides an improved composite primer formula, and the preparation of the primer layer is carried out by using the composite primer. In the composite primer, the sodium polyaspartate, the silica sol and the cerium nitrate have self-assembly function, and can be assembled on the surface of the steel pipe body to form a hybrid film. In the hybrid film, the sodium polyaspartate can form coordination bonds with metal on the surface of the steel pipe body, so that the hybrid film and the steel pipe body have good bonding effect. The sodium polyaspartate in the hybrid film contains a large amount of amino groups, and the amino groups in the amino acid units can be cured and crosslinked with the epoxy groups, so that the aqueous epoxy zinc-rich primer can be crosslinked with the hybrid film in the curing process of the composite primer, and a primer layer with good adhesion effect is formed. On the basis of the primer layer, an anticorrosive paint film with stronger adhesive force can be obtained by sequentially forming the intermediate paint layer and the top paint layer. Because the adhesive force of the anti-corrosion paint film is stronger, the anti-corrosion paint film has stronger resistance effect on external force impact, and is not easy to fall off when being impacted by external force, and the formation of the hybrid film improves the isolation effect of the anti-corrosion paint film on external corrosive substances, so that the straight-slit pipeline steel pipe has better anti-corrosion effect.
Preferably, the composite primer comprises the following components in parts by weight: 104-108 parts of water-based epoxy zinc-rich primer, 30-36 parts of silica sol, 1.6-1.8 parts of sodium polyaspartate and 1.2-1.8 parts of cerium nitrate.
Through adopting above-mentioned technical scheme, the raw materials ratio of compound primer has been optimized to this application, has strengthened the adhesive force of anticorrosive paint film, has improved the protection effect of anticorrosive paint film to straight seam pipeline steel pipe, helps prolonging straight seam pipeline steel pipe's life.
Preferably, the weight average molecular weight of the sodium polyaspartate is 3600-5700.
Through adopting above-mentioned technical scheme, the application has optimized polyaspartic acid's weight average molecular weight, has strengthened the adhesive force of anticorrosive paint film, has improved the protection effect of anticorrosive paint film to the straight seam pipeline steel pipe, helps prolonging the life of straight seam pipeline steel pipe.
Preferably, the silica mass fraction of the silica sol is 34-40%.
By adopting the technical scheme, the silica mass fraction of the silica sol is optimized, the adhesive force of the anti-corrosion paint film is enhanced, the protection effect of the anti-corrosion paint film on the straight-seam pipeline steel pipe is improved, and the service life of the straight-seam pipeline steel pipe is prolonged.
Preferably, the component of the composite primer further comprises a silane coupling agent, wherein the silane coupling agent has amino groups in molecules, and the silane coupling agent is used in an amount of 0.2-1.4% of the weight of the silica sol.
By adopting the technical scheme, the silane coupling agent with amino groups in molecules is added into the composite primer, the silicon hydroxyl groups generated after the silane coupling agent is hydrolyzed can be dehydrated and condensed with the silicon hydroxyl groups in the silica sol, and the amino groups in the silane coupling agent molecules can participate in the curing reaction of the water-based epoxy zinc-rich primer, so that the crosslinking effect of the water-based epoxy zinc-rich primer and the hybrid film is improved, and the adhesive force of an anti-corrosion paint film is enhanced.
Preferably, the silane coupling agent is used in an amount of 0.6 to 1.4% by weight of the silica sol.
By adopting the technical scheme, the dosage of the silane coupling agent is optimized, the crosslinking effect of the water-based epoxy zinc-rich primer and the hybrid film is improved, and the adhesive force of the anti-corrosion paint film is enhanced.
Preferably, the composite primer comprises sulfonated graphene, wherein the dosage of the sulfonated graphene is 0.1-0.2% of the weight of the aqueous epoxy zinc-rich primer.
Through adopting above-mentioned technical scheme, this application is through preferring, has increased sulfonated graphene in the component of compound primer, and the conductivity of primer layer can be strengthened in the addition of sulfonated graphene, helps improving the cathodic protection effect of primer layer, has alleviateed the electrochemical corrosion of steel pipe body.
Preferably, the sulfonated graphene is prepared according to the following method:
oxidizing graphite to obtain oxidized graphite; reducing the graphite oxide by using a reducing agent to obtain pre-reduced graphite oxide; preparing a suspension from pre-reduced graphite oxide, adding the suspension into a diazonium p-aminobenzenesulfonate solution, stirring under ice bath conditions, performing ultrasonic dispersion, washing with deionized water to neutrality, performing secondary reduction on the washing product with hydrazine hydrate, and drying to obtain the sulfonated graphene.
Through the adoption of the technical scheme, the application adds the aminobenzenesulfonic acid diazonium salt in the process of preparing the graphene, so that the graphene with the sulfonic group loaded on the surface, namely sulfonated graphene, is obtained.
Preferably, the dosage of the sulfonated graphene is 0.15-0.2% of the weight of the aqueous epoxy zinc-rich primer.
Through adopting above-mentioned technical scheme, the application has preferred the quantity of sulfonated graphene, has improved the cathodic protection effect of priming paint layer, has alleviateed the electrochemical corrosion of steel pipe body.
In a second aspect, the present application provides a process for manufacturing a straight-seam pipeline steel pipe, which adopts the following technical scheme.
A preparation process of a straight-seam pipeline steel pipe comprises the following steps:
(1) In a straight welded pipe production line, taking a coiled plate as a raw material to carry out production processing and finishing to obtain a steel pipe body;
(2) Spraying the composite primer on the surface of the steel pipe body, and baking and curing to obtain a primer layer; spraying epoxy glass flake paint on the surface of the primer layer, and waiting for curing the epoxy glass flake paint to obtain an intermediate paint layer; and spraying the aliphatic polyurethane finish paint on the surface of the intermediate paint layer, and after the aliphatic polyurethane finish paint is cured into a finish paint layer, obtaining an anti-corrosion paint film consisting of the primer layer, the intermediate paint layer and the finish paint layer, thus finishing the preparation of the straight-seam pipeline steel pipe.
Through adopting above-mentioned technical scheme, this application has first carried out the production of steel pipe body, then has loaded primer layer, intermediate coat and finish coat in proper order on steel pipe body surface, has obtained anticorrosive paint film, has accomplished the preparation of straight seam pipeline steel pipe.
In summary, the present application has the following beneficial effects:
1. the adhesive force of the anti-corrosion paint film is stronger, so that the anti-corrosion paint film has stronger resistance effect on external impact, is not easy to fall off when external impact occurs, and the isolation effect of the anti-corrosion paint film on external corrosive substances is improved due to the formation of the hybrid film, so that the straight-seam pipeline steel pipe has better anti-corrosion effect.
2. According to the application, the sulfonated graphene is added into the components of the composite primer, so that the conductivity of the primer layer can be enhanced, the cathode protection effect of the primer layer can be improved, and the electrochemical corrosion of the steel pipe body can be relieved.
Detailed Description
The present application will be described in further detail with reference to examples, preparations and comparative examples, and the raw materials referred to in the present application are all commercially available.
Preparation example of sulfonated graphene
The following is an example of preparation 1.
Preparation example 1
In this preparation example, sulfonated graphene is prepared according to the following method:
(1) Dissolving potassium persulfate and phosphorus pentoxide in concentrated sulfuric acid, adding graphite, heating in a water bath at 80 ℃, mechanically stirring for 4.5 hours, cooling to room temperature (20 ℃) and then diluting and filtering, uniformly mixing the residual solid with the concentrated sulfuric acid after washing and drying, ice-bathing to 0 ℃, adding potassium permanganate powder (the reaction temperature is controlled to be not more than 5 ℃), oxidizing for 2 hours under the conditions of heating in the water bath at 35 ℃ and mechanically stirring, diluting with deionized water which is 5 times the volume of the mixture, adding hydrogen peroxide until yellow precipitate is generated, filtering while the product is hot, washing the product with 3.4% (mass fraction) hydrochloric acid solution, washing with deionized water, and drying to obtain graphite oxide;
(2) Reducing graphite oxide with a reducing agent sodium borohydride under the water bath condition of 70 ℃ to obtain pre-reduced graphite oxide; preparing a 1mg/mL pre-reduced graphite oxide suspension, adding a diazonium p-aminobenzenesulfonate solution (1.35 g,10 mL) into the suspension, stirring for 6h under an ice bath, performing ultrasonic treatment for 30min, washing with deionized water to reach pH=7, performing secondary reduction with hydrazine hydrate (the weight ratio of the hydrazine hydrate to the pre-reduced graphite oxide is 1:1), and drying to obtain sulfonated graphene.
Examples
Examples 1 to 5
The following description will take example 1 as an example.
Example 1
In the embodiment, the type of the water-based epoxy zinc-rich primer used is Barrier 80WF 6DY, the type of the epoxy glass flake paint is Penguard Pro GF, and the type of the aliphatic polyurethane finishing paint is Hardtop AX.
The composite primer used in this example comprises the following components: 100kg of water-based epoxy zinc-rich primer, 24kg of silica sol, 1.4kg of sodium polyaspartate and 0.4kg of cerium nitrate; the weight average molecular weight of the sodium polyaspartate is 1800, and the mass fraction of silicon dioxide of the silica sol is 28%.
In this example, a straight-seam pipeline steel pipe was prepared according to the following steps:
(1) Sequentially performing plate coil preparation, feeding, uncoiling a shovel head, leveling, crop head, shearing butt welding, looper storage, edge milling, crushed aggregates collection, steel plate flaw detection, forming, steel tube welding, crushed aggregates collection, inner and outer burr scraping, no. 1 drawing out of a frame, steel tube online ultrasonic detection, weld annealing treatment, no. 2 drawing out of the frame, air cooling, water cooling, sizing straightening, marking, sizing cutting, steel tube output, cutting a way after the steel tube output to a sampling/cutting machine through a blanking frame to intercept a sample or cut a defective pipe section, and conveying to an appearance size detection through another routing chain conveyor, then flushing inner burrs in the pipe, flat head chamfering, hydrostatic testing, ultrasonic detection of pipe bodies and pipe ends, appearance detection, weighing length measurement, final detection, warehousing, appearance detection, rechecking of defective steel pipes, and returning to flat head chamfering after grinding/cutting to obtain a steel pipe body; the specification of the steel pipe body in the step is X65, and the chemical components are as follows: 0.03% of carbon, 0.17% of silicon, 1.51% of manganese, 0.024% of phosphorus, 0.005% of sulfur, 0.17% of nickel, 0.04% of copper, 0.16% of molybdenum, 0.006% of nitrogen, 0.06% of niobium, 0.02% of aluminum, 0.01% of titanium and the balance of iron;
(2) Spraying the composite primer on the surface of the steel pipe body, and baking and curing to obtain a primer layer; spraying epoxy glass flake paint on the surface of the primer layer, and waiting for curing the epoxy glass flake paint to obtain an intermediate paint layer; spraying the aliphatic polyurethane finish paint on the surface of the intermediate paint layer, and after the aliphatic polyurethane finish paint is cured into a finish paint layer, obtaining an anti-corrosion paint film consisting of a primer layer, the intermediate paint layer and the finish paint layer, thus finishing the preparation of the straight-seam pipeline steel pipe; in this step, the spray gun pressure was 0.45MPa, the spray distance was 250mm, and the thickness of each spray was controlled at 200. Mu.m.
As shown in Table 1, examples 1 to 5 are different in mainly the raw material ratios of the composite primer
Table 1 raw material ratio of composite primer
| Sample of | Water-based epoxy zinc-rich primer/kg | Silica sol/kg | Polyaspartic acid sodium salt/kg | Cerium nitrate/kg |
| Example 1 | 100 | 24 | 1.4 | 0.4 |
| Example 2 | 102 | 26 | 1.5 | 0.7 |
| Example 3 | 104 | 28 | 1.6 | 1.0 |
| Example 4 | 106 | 30 | 1.7 | 1.4 |
| Example 5 | 108 | 32 | 1.8 | 1.8 |
Examples 6 to 9
Examples 6-9 differ from example 5 in the weight average molecular weight of sodium polyaspartate as in Table 2.
TABLE 2 weight average molecular weight of sodium polyaspartate
| Sample of | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 |
| Weight average molecular weight | 1800 | 2700 | 3600 | 4400 | 5700 |
Examples 10 to 13
As shown in Table 3, examples 10-13 differ from example 9 in the silica mass fraction of the silica sol.
TABLE 3 silica mass fraction of silica sols
| Sample of | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 |
| Silica mass fraction/% | 28 | 31 | 34 | 37 | 40 |
Example 14
The difference between this example and example 13 is that the composite primer further comprises a silane coupling agent, wherein methyltriethoxysilane is used as the silane coupling agent, and the amount of the silane coupling agent is 0.2% of the weight of the silica sol.
Example 15
This example differs from example 14 in that the silane coupling agent is gamma-aminopropyl triethoxysilane.
As shown in Table 4, examples 15 to 19 were different in that the amount of the silane coupling agent used was different in terms of the percentage by weight of the silica sol (hereinafter referred to as the silane ratio).
TABLE 4 silane duty cycle
| Sample of | Example 15 | Example 16 | Example 17 | Example 18 | Example 19 |
| Silane duty cycle/% | 0.2 | 0.4 | 0.6 | 1.1 | 1.4 |
Example 20
This example differs from example 19 in that the composition of the composite primer includes sulfonated graphene, which is prepared according to the method of preparation example 1, in an amount of 0.1% by weight of the aqueous epoxy zinc-rich primer.
As shown in Table 5, examples 20 to 24 were different in that the amount of the sulfonated graphene was different in percentage by weight of the aqueous epoxy zinc-rich primer (hereinafter referred to as the sulfonated graphene ratio).
Table 5 sulfonated graphene occupancy ratio
| Sample of | Example 20 | Example 21 | Example 22 | Example 23 | Example 24 |
| Sulfonated graphene duty cycle/% | 0.1 | 0.12 | 0.15 | 0.18 | 0.2 |
Comparative example
Comparative example 1
This comparative example differs from example 1 in that the preparation of the primer layer was carried out using only an aqueous epoxy zinc-rich primer, without the addition of silica sol, sodium polyaspartate and cerium nitrate.
Comparative example 2
This comparative example differs from example 1 in that the components of the composite primer do not include cerium nitrate.
Comparative example 3
This comparative example differs from example 1 in that the components of the composite primer do not include silica sol.
Comparative example 4
This comparative example differs from example 1 in that the components of the composite primer do not include sodium polyaspartate.
Performance detection test method
1. Adhesion force
The coating adhesion was tested by pull-off method using a PATM01 hydraulic instrument according to ISO 4624-2002 "paint and varnish pull-off method adhesion test", and then the ratio of the coating adhesion of each example, comparative example, to the coating adhesion of comparative example 1 was calculated based on comparative example 1 and the ratio was recorded as relative adhesion, and the results are shown in Table 6.
2. Corrosion resistance
Selecting a steel sheet made of X65 steel with the size of 10mm multiplied by 2mm, polishing to a number 1200 to form a bright mirror surface by using sand paper, cleaning by using acetone and deionized water, drying, and loading an anti-corrosion paint film on the surface of the steel sheet according to the mode described in the embodiment to obtain a sample. The method comprises the steps of using a CH1600E electrochemical workstation, adopting a three-electrode system, and determining the corrosion current density of a sample by combining a Tafil tangent epitaxy method, wherein a corrosion medium is sodium chloride solution with the mass fraction of 3.5%, a reference electrode is a silver/silver chloride electrode, and a comparison electrode is a graphite electrode. The ratio between the corrosion current densities of each example and comparative example 1 was calculated based on comparative example 1, and the ratio was recorded as the relative corrosion current density, and the calculation results of the relative corrosion current density are shown in table 6.
TABLE 6 relative adhesion and relative corrosion current density
As can be seen by combining examples 1-5 and comparative example 1 with Table 6, the relative adhesion forces measured in examples 1-5 are all greater than that in comparative example 1, and the relative corrosion current densities are all less than that in comparative example 1, which indicates that the corrosion-resistant paint film of the present application has strong adhesion force and strong resistance effect to external force impact, and is not easy to fall off when external force is impacted. Meanwhile, the formation of the hybrid film improves the isolation effect of the anti-corrosion paint film on external corrosive substances, so that the straight-seam pipeline steel pipe has good anti-corrosion performance. In examples 1-5, examples 3-5 showed lower relative adhesion and higher relative corrosion current density, indicating that the composite primer formulated according to the formulation of examples 3-5 helps to improve the adhesion of the corrosion protection paint film and the corrosion resistance of the straight line steel pipe.
As can be seen from the combination of example 1 and comparative examples 2 to 4 and table 6, the comparative examples 2 to 4 each have a smaller relative adhesion than example 1, indicating that the corrosion protection paint film has a poor adhesion to the surface of the steel pipe body when the silica sol, the sodium polyaspartate and the cerium nitrate are not used in combination.
As can be seen by combining examples 5-9 and Table 6, when the weight average molecular weight of the sodium polyaspartate is 3600-5700, the adhesive force of the anti-corrosion paint film is stronger, the protection effect of the anti-corrosion paint film on the straight-seam pipeline steel pipe is improved, and the service life of the straight-seam pipeline steel pipe is prolonged.
As can be seen by combining examples 9-13 and combining Table 6, when the mass fraction of the silica in the silica sol is 34-40%, the adhesive force of the anti-corrosion paint film is stronger, the protection effect of the anti-corrosion paint film on the straight-seam pipeline steel pipe is improved, and the service life of the straight-seam pipeline steel pipe is prolonged.
It can be seen from the combination of example 13, example 14 and Table 6 that the amino-free silane coupling agent has a limited effect of improving the adhesion to the anticorrosive paint film.
As can be seen from the combination of examples 14 and examples 15 to 19 and Table 6, the relative adhesion force measured in examples 15 to 19 is greater than that in example 14, which indicates that the amino groups in the silane coupling agent molecules improve the crosslinking effect of the aqueous epoxy zinc-rich primer and the hybrid film by participating in the curing reaction of the aqueous epoxy zinc-rich primer, and enhance the adhesion force of the anticorrosive paint film.
As can be seen from the combination of examples 19, examples 20-24 and table 6, the relative adhesion force measured in examples 20-24 is greater than that in example 19 and the relative corrosion current density is much less than that in example 19, indicating that the addition of sulfonated graphene helps to improve the adhesion of the corrosion resistant paint film and enhance the corrosion resistance of the straight-seam pipeline steel pipe.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (10)
1. The straight-seam pipeline steel pipe is characterized by comprising a steel pipe body and an anti-corrosion paint film covered on the surface of the steel pipe body, wherein the anti-corrosion paint film comprises a primer layer, a middle paint layer and a top paint layer, the primer layer is obtained after a composite primer is cured, and the composite primer comprises the following components in parts by weight: 100-108 parts of water-based epoxy zinc-rich primer, 24-36 parts of silica sol, 1.4-1.8 parts of sodium polyaspartate and 0.4-1.8 parts of cerium nitrate, wherein the weight average molecular weight of the sodium polyaspartate is 1800-5700.
2. The straight seam line steel pipe of claim 1, wherein the composite primer comprises the following components in parts by weight: 104-108 parts of water-based epoxy zinc-rich primer, 30-36 parts of silica sol, 1.6-1.8 parts of sodium polyaspartate and 1.2-1.8 parts of cerium nitrate.
3. The straight welded pipeline steel pipe according to claim 1, wherein the weight average molecular weight of the sodium polyaspartate is 3600-5700.
4. The straight line steel pipe according to claim 1, wherein the silica sol has a silica mass fraction of 34-40%.
5. The straight line steel pipe according to claim 4, wherein the component of the composite primer further comprises a silane coupling agent having an amino group in a molecule, and the silane coupling agent is used in an amount of 0.2 to 1.4% by weight of the silica sol.
6. The straight line steel pipe according to claim 5, wherein the silane coupling agent is used in an amount of 0.6 to 1.4% by weight of the silica sol.
7. The straight joint pipeline steel pipe of claim 1, wherein the components of the composite primer include sulfonated graphene, and the amount of the sulfonated graphene is 0.1-0.2% of the weight of the aqueous epoxy zinc-rich primer.
8. The straight joint line steel pipe according to claim 7, wherein the sulfonated graphene is prepared according to the following method:
oxidizing graphite to obtain oxidized graphite; reducing the graphite oxide by using a reducing agent to obtain pre-reduced graphite oxide; preparing a suspension from pre-reduced graphite oxide, adding the suspension into a diazonium p-aminobenzenesulfonate solution, stirring under ice bath conditions, performing ultrasonic dispersion, washing with deionized water to neutrality, performing secondary reduction on the washing product with hydrazine hydrate, and drying to obtain the sulfonated graphene.
9. The straight joint line steel pipe of claim 7, wherein the amount of the sulfonated graphene is 0.15-0.2% by weight of the aqueous epoxy zinc-rich primer.
10. The preparation process of the straight-seam pipeline steel pipe is characterized by comprising the following steps of:
(1) In a straight welded pipe production line, taking a coiled plate as a raw material to carry out production processing and finishing to obtain a steel pipe body;
(2) Spraying the composite primer according to any one of claims 1-9 on the surface of the steel pipe body, and baking and curing to obtain a primer layer; spraying epoxy glass flake paint on the surface of the primer layer, and waiting for curing the epoxy glass flake paint to obtain an intermediate paint layer; and spraying the aliphatic polyurethane finish paint on the surface of the intermediate paint layer, and after the aliphatic polyurethane finish paint is cured into a finish paint layer, obtaining an anti-corrosion paint film consisting of the primer layer, the intermediate paint layer and the finish paint layer, thus finishing the preparation of the straight-seam pipeline steel pipe.
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