CN1597142A - Anti corrusion pipeline spray coating opening mending method - Google Patents
Anti corrusion pipeline spray coating opening mending method Download PDFInfo
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- CN1597142A CN1597142A CN 200410043897 CN200410043897A CN1597142A CN 1597142 A CN1597142 A CN 1597142A CN 200410043897 CN200410043897 CN 200410043897 CN 200410043897 A CN200410043897 A CN 200410043897A CN 1597142 A CN1597142 A CN 1597142A
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- corrosion pipeline
- spraying
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Abstract
A method for reparing the anticorrosion layer at the connection position between two anticorrosion pipes incldues such steps as blasting sand, treating surface, brushing, primping paint and spraying polyurea paint.
Description
Technical field:
The present invention relates to the method for anti-corrosion pipeline repaired mouth in the anti-corrosion pipeline construction field, belong to a kind of anti-corrosion pipeline spraying and welding seam mending method.
Background technology:
At present, anti-corrosion pipeline adopts epoxy powder, two layers of polyethylene and three-decker etc. as anti-corrosion material usually, wherein epoxy powder, two layers of polyethylene and three-decker have good performance as the buried steel pipeline external anticorrosive material, especially polyethylene three-decker insulating properties, have good stability, anti-aging, water-fast, heatproof degree changes, enough mechanical strengths are arranged, good cementability is arranged with pipeline.The anticorrosive coat of pipe main body is by prefabricated the finishing of automated job line of special use in factory, technology controlling and process is relatively easy, the quality of its anticorrosive coat and overcoat is reliable, and every pipe ends will be reserved 100-200mm and do not do anticorrosionly, waits until and carries out repaired mouth again after the on-the-spot welding and handle.
But under pipeline anticorrosion coating repaired mouth and overhaul hole, during operation, select for use above material in construction, to have certain difficulty.At first because of epoxy powder, two layers and three layers coating material of polyethylene, it is huge at construction link complex process such as pipeline preheating, electrostatic spraying, plastic squeeze, extrusion molding or winding coating, equipment, and equipment must be along the duct segments coating of constructing continuously, so there is on-the-spot walking construction problem in equipment.So the on-the-spot thermal shrinkable sleeve repaired mouth that adopts usually, it is bigger that this jointing method is influenced by environmental factor and human factor, and heat is melted the bonding work progress makes that shrinking cover easily forms air pocket, air bubble; The contraction of body surface preheating and heating-up temperature and material is asynchronous, thereby cause that adhesive force of coatings descends, the most important thing is that thermal shrinkable sleeve polarity is low and poor with the compatibility of body coating, along with the increase of service life, summer in winter alternately, heat shrinking sleeve easily produces with the body coating and separates.This jointing method can not form closely continuous corrosion protection system with former anticorrosive coat, becomes the weak link of pipeline corrosion protection and influences the quality of whole anticorrosive coat, the life-span of reducing pipeline anticorrosion coating.
Summary of the invention:
In order to solve existing anti-corrosion pipeline jointing method, the repaired mouth coating easily produces with body separates, make the problem of the life-span reduction of pipeline anticorrosion coating, the invention provides a kind of anti-corrosion pipeline spraying and welding seam mending method, this jointing method is subjected to such environmental effects little, coating and body intermiscibility are good, and can form closely continuous corrosion protection system with former anticorrosive coat, and do not produce separation.Thereby improved the service life of anti-corrosion pipeline.
Technical scheme of the present invention is: this anti-corrosion pipeline spraying and welding seam mending method, be after the mouth of pipe of anti-corrosion pipeline has welded, to have carried out mouth of pipe derusting by sandblasting, the environmental protection sand-blasting machine is adopted in mouth of pipe derusting by sandblasting, the sand material adopts good 25-40 purpose corundum sand or the steel sand of wearability, and the anticorrosion of its repaired mouth realized by following step:
1, repaired mouth lap-joint surface treatment, the lap of splice on this repaired mouth lap-joint anticorrosive coat surface is 50-200mm, and available flame heat method is handled, and promptly heats on lap-joint anticorrosive coat surface with the remelting rifle, and temperature is controlled at 60-80 ℃; Also available corona processor is handled lap-joint anticorrosive coat surface, what this corona processor adopted is that application number is 03265518.5 hand push rolling electrode processor, make this surface produce rough matsurface, increase surface tension, produce unsaturated bond simultaneously, and increase the surface energy, like this, lap-joint anticorrosive coat surface after the processing has extremely strong adhesive force, and with opening-supplementing material good bonding plyability is arranged;
2, brushing primer, primer adopt the Polyurethane glue stick, after handling the anticorrosive coat surface, and lap-joint anticorrosive coat surface and the mouth of pipe place that the brushing of Polyurethane glue stick is being handled at once; Also can use powdery copolymer glue to do primer, powdery copolymer glue is sprayed onto on mouth of pipe surface and the overlap joint anticorrosive coat surface, and the temperature of assurance mouth of pipe surface and overlap joint anticorrosive coat surface is at 60-80 ℃ with the flame spraying plastic powder technique rifle;
3, spray polyurea coating, with the spraying of carbamide paint spraying equipment, after amine ester gum stick was reunited in brushing, the surface was dried and is carried out the carbamide paint spraying after 3 minutes, helped combining of carbamide paint and Polyurethane glue stick; Perhaps when having sprayed powdery copolymer glue, carry out the carbamide paint spraying during at 60～80 ℃ in mouth of pipe temperature and lap-joint's anticorrosive coat surface temperature.
The present invention has following beneficial effect: because this jointing method has used the carbamide paint opening-supplementing material, and adopt flame heat or corona processor to handle the anticorrosive coat of anti-corrosion pipeline mouth of pipe overlap joint, especially adopt corona processor to handle the anticorrosive coat of mouth of pipe overlap joint, this processing method can make anticorrosive coat produce rough matsurface and unsaturated bond, increase anticorrosive coat surface tension and surface energy, make the anticorrosive coat surface have extremely strong adhesive force, thereby good bonding plyability is arranged with the carbamide paint opening-supplementing material.Coating has excellent physical property, weatherability, resistance to ag(e)ing, heatproof good stability; Be subjected to construction environment temperature, humidity effect little, the reaction curing rate is fast, can spray not sagging continuously.
The specific embodiment:
This anti-corrosion pipeline spraying and welding seam mending method, be after the mouth of pipe of anti-corrosion pipeline has welded, to have carried out mouth of pipe derusting by sandblasting, the environmental protection sand-blasting machine is adopted in mouth of pipe derusting by sandblasting, but reclaim on sandblast limit, limit, the dust, oxide skin etc. that utilize vavuum pump will be sprayed onto the sand grains of metal surface reflection and generation are drawn onto the recovery chamber of sand-blasting machine, after filtration, sand grains is reused.Use this sand-blasting machine, do not have dust in the air, the body surface does not have floating dust, saves further cleaning process, and more than the rust cleaning quality Sa2.5 level, the sand material adopts good 25-40 purpose corundum sand or the steel sand of wearability, and the anticorrosion of its repaired mouth realized by following step:
1, repaired mouth lap-joint surface treatment, the lap of splice on this repaired mouth lap-joint anticorrosive coat surface is 50-200mm, and available flame heat method is handled, and promptly with the flame heat lap-joint anticorrosive coat surface of remelting rifle generation, temperature is controlled at 60-80 ℃; Also available corona processor is handled lap-joint anticorrosive coat surface, this processing method is that the lap-joint surface is placed between the two poles of the earth of corona discharge, an electrode grounding, and another electrode connects high voltage source, make two interpolars in environment such as air, oxygen, nitrogen, discharge bombarded surface.Its surface produces two kinds of variations in the bombardment process, and the one, physical change, i.e. corona bombardment frosting produces rough matsurface, increases its surface tension; The 2nd, chemical change, promptly by electrion, ionization airborne oxygen, produce ozone, chemical reaction takes place with the anticorrosive coat surface, make its surface produce unsaturated bond, increase surperficial energy.Two kinds of variations make the anticorrosive coat surface have extremely strong adhesive force, thereby with opening-supplementing material good bonding plyability are arranged;
2, brushing primer, primer adopt the Polyurethane glue stick, after handling the anticorrosive coat surface, and lap-joint anticorrosive coat surface and the mouth of pipe place that the brushing of Polyurethane glue stick is being handled at once; Also can use powdery copolymer glue to do primer, powdery copolymer glue is sprayed onto on mouth of pipe surface and the overlap joint anticorrosive coat surface, and the temperature of assurance mouth of pipe surface and overlap joint anticorrosive coat surface is at 60-80 ℃ with the flame spraying plastic powder technique rifle;
3, spray polyurea coating is used the carbamide paint spraying equipment, and after having brushed Polyurethane class air curing type adhesive, the surface is dried after 3 minutes and carried out, and helps combining of carbamide paint and Polyurethane glue stick; Perhaps when having sprayed powdery copolymer glue, carry out during at 60-80 ℃ in mouth of pipe temperature and lap-joint's anticorrosive coat surface temperature.Carbamide paint is a kind of novel solvent-free, bi-component environmental-protecting coating, and the spraying back can form one deck polyurea elastomer coating by gel in several seconds, just can reach the intensity of walking thereon in a few minutes, the construction efficiency height, and workpiece need not heat.This coating application is not subjected to the influence of environment temperature and humidity, and good weatherability is used not efflorescence out of doors for a long time, do not ftractureed, do not come off, and this elastomer has excellent Corrosion Protection and mechanical performance simultaneously.
Claims (9)
1, a kind of anti-corrosion pipeline spraying and welding seam mending method is carried out derusting by sandblasting and is handled after the mouth of pipe of anti-corrosion pipeline has welded, it is characterized in that: the anti-corrosion pipeline repaired mouth is realized by following step:
A, the surface treatment of repaired mouth lap-joint;
B, brushing primer;
C, spray polyurea coating;
2, a kind of anti-corrosion pipeline spraying and welding seam mending method according to claim 1 is characterized in that: repaired mouth lap-joint anticorrosive coat surface is heated to 60 ℃-80 ℃ with the remelting rifle;
3, a kind of anti-corrosion pipeline spraying and welding seam mending method according to claim 1 is characterized in that: the also available corona processor in repaired mouth lap-joint anticorrosive coat surface is handled, and makes this overlap joint surface produce rough matsurface;
4, according to claim 1,2 or 3 described a kind of anti-corrosion pipeline spraying and welding seam mending methods, it is characterized in that: the lap of splice of repaired mouth lap-joint surface anticorrosion layer is 50-200mm;
5, a kind of anti-corrosion pipeline spraying and welding seam mending method according to claim 1 is characterized in that: primer adopts the Polyurethane glue stick;
6, a kind of anti-corrosion pipeline spraying and welding seam mending method according to claim 1, it is characterized in that: primer also can adopt powdery copolymer glue;
7, a kind of anti-corrosion pipeline spraying and welding seam mending method according to claim 1 is characterized in that: adopt carbamide paint spraying equipment spray polyurea coating;
8, according to claim 1,5 or 7 described a kind of anti-corrosion pipeline spraying and welding seam mending methods, it is characterized in that: after amine ester gum stick was reunited in brushing, the surface was dried and is carried out the carbamide paint spraying after 3 minutes;
9, it is characterized in that according to claim 1,6 or 7 described a kind of anti-corrosion pipeline spraying and welding seam mending methods: after having sprayed powdery copolymer glue, carry out the spraying of carbamide paint during at 60 ℃-80 ℃ in mouth of pipe temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410043897 CN1289211C (en) | 2004-09-27 | 2004-09-27 | Anti corrusion pipeline spray coating opening mending method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410043897 CN1289211C (en) | 2004-09-27 | 2004-09-27 | Anti corrusion pipeline spray coating opening mending method |
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| Publication Number | Publication Date |
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| CN1597142A true CN1597142A (en) | 2005-03-23 |
| CN1289211C CN1289211C (en) | 2006-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410043897 Active CN1289211C (en) | 2004-09-27 | 2004-09-27 | Anti corrusion pipeline spray coating opening mending method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100540975C (en) * | 2007-12-25 | 2009-09-16 | 北京北科双元涂料科技有限公司 | A kind of method for joint coating on pipeline |
| CN102518909A (en) * | 2011-12-28 | 2012-06-27 | 中国石油天然气股份有限公司 | Method for mending large-caliber long-distance pipeline in permafrost zone |
| CN103586781A (en) * | 2012-08-13 | 2014-02-19 | 中国石油集团工程技术研究院 | Automatic sand blasting and rust removal device |
| CN114192294A (en) * | 2021-12-08 | 2022-03-18 | 江苏安卡新材料科技有限公司 | Adhesive application for improving polyurea spraying quality |
-
2004
- 2004-09-27 CN CN 200410043897 patent/CN1289211C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100540975C (en) * | 2007-12-25 | 2009-09-16 | 北京北科双元涂料科技有限公司 | A kind of method for joint coating on pipeline |
| CN102518909A (en) * | 2011-12-28 | 2012-06-27 | 中国石油天然气股份有限公司 | Method for mending large-caliber long-distance pipeline in permafrost zone |
| CN103586781A (en) * | 2012-08-13 | 2014-02-19 | 中国石油集团工程技术研究院 | Automatic sand blasting and rust removal device |
| CN103586781B (en) * | 2012-08-13 | 2016-10-05 | 中国石油集团工程技术研究院 | A kind of automatic sand blasting device |
| CN114192294A (en) * | 2021-12-08 | 2022-03-18 | 江苏安卡新材料科技有限公司 | Adhesive application for improving polyurea spraying quality |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1289211C (en) | 2006-12-13 |
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