CN1736617A - Cooling method of hot polythene coating of steel pipe - Google Patents
Cooling method of hot polythene coating of steel pipe Download PDFInfo
- Publication number
- CN1736617A CN1736617A CN 200410056909 CN200410056909A CN1736617A CN 1736617 A CN1736617 A CN 1736617A CN 200410056909 CN200410056909 CN 200410056909 CN 200410056909 A CN200410056909 A CN 200410056909A CN 1736617 A CN1736617 A CN 1736617A
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- Prior art keywords
- steel pipe
- cooling
- coated
- polyethylene
- water
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Abstract
The invention discloses a method for cooling down the steel pipe thermally coated with polyethylene antiseptic cover. It cools down by dipping the steel pipe coated with polyethylene antiseptic cover directly into the cooling water added sodium alkyl benzene sulphonate surface activator. The technique is simple, rapid, and it can guarantee the quality of steel pipe thermally coated with polyethylene antiseptic cover.
Description
Technical field
The present invention is coated with cooling means behind the polyethylene anticorrosion coating to steel pipe heat.Relate to the technology that the thermoplastic moulding uses, the general corrosion protection and the pipe-line system technical field of metal material.
Background technology
Steel pipe heat is coated with in the polyethylene anticorrosion coating technology, after heat is coated with polyethylene, must cool off, make anticorrosive coat solidify, finalize the design, so that in time transmit to it, descend online detection operation together, and then make the steel pipe that has applied the polyethylene anticorrosion coating roll off the production line, dispatch from the factory.When special heat as simple, the stay-in-grade showering mode of adopting process is coated with polyethylene anticorrosion coating technology, by current the most advanced Japan's first homogeneous tube high-frequency (a steel pipe full-length is 12 meters) showering method, though be that a homogeneous tube is carried out showering simultaneously, showering speed is fast on the surface, but because the polyethylene cover in the showering just is very soft when 200 ℃ of left and right sides, do not solidify, finalize the design, can not transmit at support wheel; Can not drench cooling for water simultaneously, otherwise water droplet pressure (gravity or expulsion pressure) can cause polyethylene surface local deformation to occur, presents " hole point ", influences tectal antiseptic effect and presentation quality.For this reason, have to adopt and carry out the nature cooling after the homogeneous tube showering earlier, to be cooled to below 100 ℃ the time, carry out water again and drench cooling, be sent to next process then.So just become " seizing by the throat " section of entire job line, prolonged the production cycle greatly, the efficiency of construction of homogeneous tube showering method is reduced greatly.With present patent application simultaneously, the local exchange application can carry out the showering of steel pipe polyethylene powders, " a kind of steel pipe heat is coated with the polyethylene anticorrosive coating method and apparatus " patent of invention that efficient is high continuously.In this method, just more can not behind hot showering polyethylene anticorrosion coating, cool off in the mode of cooling naturally.A kind of rapid cooling method must be arranged,, improve the production efficiency of production line to adapt to the production cycle of the hot showering polyethylene anticorrosive coating of whole steel pipe production line.
Summary of the invention
The objective of the invention is to invent a kind of steel pipe heat and be coated with behind the polyethylene anticorrosion coating fast that a kind of steel pipe heat of cooling is coated with polyethylene anticorrosion coating cooling means.
Also to be coated with polyethylene anticorrosion coating cooling means the same with present most steel pipe heat in the present invention, adopts water-cooling method.But the steel pipe polyethylene anticorrosion coating of considering this moment can not water drenches or sprays, so the present invention adopts the direct entry of steel pipe---the method for " wearing water " that will apply behind the polyethylene, the temperature that applies steel pipe can be dropped to below 100 ℃ fast like this.But because the thermal coefficient of expansion of steel is 11 * 10
-6/ ℃, poly thermal coefficient of expansion is 10 * 10
-5/ ℃, differ an order of magnitude, when the entry of coating steel pipe, owing to amount of contraction between polyethylene layer and the steel pipe has the surface tension effects of some differences and water, can cause polyethylene cover surface foldover, and the adhesive force that may reduce polyethylene cover and steel pipe.So, be worthless with the pure water cooling.The present invention adopts the method for adding surfactant in cooling water for overcoming the problems referred to above.Comparatively it is desirable to add sodium alkyl benzene sulfonate class surfactant, its addition is to account for 0.02 ‰～0.10 ‰ of total cooling water weight, and optimum addition is 0.05 ‰ of total cooling water weight.Add surfactant in cooling water after, at first can reduce the surface tension of water, next has strengthened the heat conduction uniformity of water, the difference of having dwindled thermal shrinking quantity between polyethylene and the steel pipe on certain intensity.For calcium, magnesium ion in the anti-sealing cause the surfactant inactivation, improve the surfactant utilization rate, also can in cooling water, add water softener, i.e. metal chelating agent.Water softener has multiple, but the most suitable be STPP, its addition accounts for 0.01 ‰～0.001 ‰ of cooling water gross weight.
The specific embodiment
Embodiment: followingly the specific embodiment of the present invention is described with embodiment.In the cooling pond of the 14m * 6m * 1m in steel pipe showering polyethylene device downstream, inject 80m
3, 18 ℃ water.Add neopelex activating agent 3kg in water, STPP water softener 1kg stirs well even.The good poly Φ 273mm steel pipe of showering (12m is long) is directly sent into the cooling pond from an end by the outlet of woods coating device, treated that the other end from the cooling pond takes out after 8 minutes, can be sent to down online detection operation together by the upper support wheel.Bright and clean, level and smooth through its cover surface of the cooled showering polyethylene of the method anticorrosion coating steel pipe, adhesive force is good between cover layer and steel pipe.Can touch the mark: surface smoothness＞50%, peel strength 〉=60N/cm between cover layer and steel pipe.
As seen this method not only simply, but also quick, and can also guarantee that steel pipe heat is coated with the quality of polyethylene anticorrosion coating, be a kind of practical method.
Claims (5)
1. a steel pipe heat is coated with polyethylene anticorrosion coating cooling means, comprises and uses water cooling, it is characterized in that the hot steel pipe of coating polyethylene anticorrosion coating directly sent in the cooling water that adds surfactant cooling off.
2. according to the patent requirement, 1 describedly is coated with polyethylene anticorrosion coating cooling means with a kind of steel pipe heat, it is characterized in that added surfactant is a sodium alkyl benzene sulfonate class activating agent in cooling water, its addition accounts for 0.02 ‰～0.10 ‰ in total cooling water inflow.
3. require 1,2 described a kind of steel pipe heat to be coated with polyethylene anticorrosion coating cooling means according to patent, it is characterized in that sodium alkyl benzene sulfonate class surfactant optimum addition in cooling water is 0.05 ‰ of a gross weight.
4. be coated with polyethylene anticorrosion coating cooling means according to claim 1,2 described a kind of steel pipe heat, it is characterized in that in cooling water, also being added with water softener.
5. a kind of steel pipe heat according to claim 4 is coated with polyethylene anticorrosion coating cooling means, it is characterized in that described water softener is a sodium phosphate trimer, and its addition is 0.01 ‰～0.001 ‰ of a cooling water total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056909 CN100512982C (en) | 2004-08-20 | 2004-08-20 | Cooling method of hot polythene coating of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056909 CN100512982C (en) | 2004-08-20 | 2004-08-20 | Cooling method of hot polythene coating of steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1736617A true CN1736617A (en) | 2006-02-22 |
| CN100512982C CN100512982C (en) | 2009-07-15 |
Family
ID=36079683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410056909 Expired - Fee Related CN100512982C (en) | 2004-08-20 | 2004-08-20 | Cooling method of hot polythene coating of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100512982C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985996A (en) * | 2010-10-29 | 2011-03-16 | 浙江菲达通球环保管业有限公司 | Process for manufacturing internal and external anti-corrosion polytetrafluoroethylene pipe fitting |
| CN104136822A (en) * | 2012-02-05 | 2014-11-05 | 德国美力有限两合公司 | Method for coating pipes |
-
2004
- 2004-08-20 CN CN 200410056909 patent/CN100512982C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985996A (en) * | 2010-10-29 | 2011-03-16 | 浙江菲达通球环保管业有限公司 | Process for manufacturing internal and external anti-corrosion polytetrafluoroethylene pipe fitting |
| CN101985996B (en) * | 2010-10-29 | 2012-06-13 | 浙江菲达通球环保管业有限公司 | Process for manufacturing internal and external anti-corrosion polytetrafluoroethylene pipe fitting |
| CN104136822A (en) * | 2012-02-05 | 2014-11-05 | 德国美力有限两合公司 | Method for coating pipes |
| US9211427B2 (en) | 2012-02-05 | 2015-12-15 | Minimax Gmbh & Co. Kg | Method for coating pipes |
| CN104136822B (en) * | 2012-02-05 | 2016-12-14 | 德国美力有限两合公司 | For the method that pipe is carried out coating |
| US9962569B2 (en) | 2012-02-05 | 2018-05-08 | Mv Pipe Technologies Gmbh | Fire extinguishing system |
| US10413765B2 (en) | 2012-02-05 | 2019-09-17 | Mv Pipe Technologies Gmbh | Fire extinguishing system |
| USRE48284E1 (en) | 2012-02-05 | 2020-10-27 | Mv Pipe Technologies Gmbh | Method for coating pipes |
| US11278753B2 (en) | 2012-02-05 | 2022-03-22 | Mv Pipe Technologies Gmbh | Fire extinguishing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100512982C (en) | 2009-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090715 Termination date: 20200820 |