CN104072793B - A kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond - Google Patents
A kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond Download PDFInfo
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- CN104072793B CN104072793B CN201310097379.8A CN201310097379A CN104072793B CN 104072793 B CN104072793 B CN 104072793B CN 201310097379 A CN201310097379 A CN 201310097379A CN 104072793 B CN104072793 B CN 104072793B
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Abstract
The invention discloses a kind of epoxy coating and the method for three-layer polyethylene coating chemical bond bonding, belong to buried long distance pipeline preventing corrosion of repaired mouth technical field.Methods described includes：Repaired mouth overlap three-layer polyethylene coating surface is cleaned after process and polarization process, liquid epoxy coating is applied, and is heated to 70～260 DEG C, keep 30s～30min.The present invention is on the basis of polarization process is carried out to three-layer polyethylene coating surface, liquid epoxy coating is heated, improve the solidification temperature of liquid epoxy coating, make the carboxylic group of polyethylene surface that chemical reaction occur at high temperature with the epoxide group of liquid epoxy coating, form chemical bond, three-layer polyethylene coating and the repaired mouth area of epoxy coating overlap joint is made to bond with chemical bond, not only increase the initial adhesion between repaired mouth overlap three-layer polyethylene coating and epoxy coating, also make it have long-term antiseptic property, meet the demand of buried long distance pipeline long service.
Description
Technical field
The present invention relates to buried long distance pipeline corrosion-resistanting interpolating port technical field, more particularly to a kind of epoxy coating and three strata second
The method of ene coatings chemical bond bonding.
Background technology
Long distance oil-gas pipeline is formed by connecting by multiple pipelines, and pipeline is externally provided with anticorrosive coat, in order in work progress
The convenience of welding, having certain length in pipeline junction does not carry out preservative treatment, needs to carry out preventing corrosion of repaired mouth process.Pipeline is mended
The quality of mouth anticorrosive quality, directly affects the overall anti-corrosion or insulation quality of pipeline, and preventing corrosion of repaired mouth technology is long distance pipeline anti-corrosion
The key of quality control.
Oil and gas pipeline Heavenly Stems and Earthly Branches line anticorrosive coat major part adopts three layers of polyethylene anticorrosive coatings at present, in existing various repaired mouths
In material, liquid epoxy coating patch technology due to the advantage such as coating process is simple, method for repairing and mending is easy, assay is reliable,
Quickly grow.
When preventing corrosion of repaired mouth process is carried out to three-layer polyethylene antiseptical pipeline using liquid epoxy coating, there is following asking
Topic：Polyethylene is typical non-polar material, and surface energy is low.And the epoxy coating after liquid epoxy repaired mouth paint solidification be containing
The highly cross-linked polar material of ehter bond, hydroxyl and amino, the cohesive energy and surface energy of epoxy coating exceed well over polyethylene, cause
The three layers of polyethylene anticorrosive coatings of repaired mouth overlap and liquid epoxy apply low, the mutual bonding of intermolecular force that interlayer formed
Power is weak.
In prior art, the method combined using polyethylene surface roughening, polarization process or two ways, in poly- second
There is provided mechanical interlock power, Van der Waals force and hydrogen bond action etc. to strengthen the poly- of repaired mouth overlap between alkene surface and epoxy coating
Cohesive force between ethylene and epoxy coating.
During the present invention is realized, inventor has found that prior art at least has problems with：The defeated steel of buried length
Pipeline can be subject to the collective effect of many factors such as moisture, temperature and soil stress during service, suffer preventing corrosion of repaired mouth coating
To destruction, Buried oil pipeline active time is longer, and the probability destroyed by preventing corrosion of repaired mouth coating is bigger, therefore, it is right
In the Buried oil pipeline that service phase is decades-long, the coating of repaired mouth overlap is needed with long-term antiseptical performance,
Antiseptical quality at repaired mouth is can ensure that.Although and prior art can increase the initial adhesion between polyethylene layer and epoxy coating
Power, there is no guarantee that its long-term antiseptic property.
The content of the invention
In order to solve problem of the prior art, the embodiment of the present invention provides a kind of epoxy coating and three-layer polyethylene coating
The method for learning key bonding.The technical scheme is as follows：
Methods described includes：Three-layer polyethylene coating surface is cleaned after process and polarization process, Breakup of Liquid Ring is applied
Oxygen coating, and 70～260 DEG C are heated to, keep 30s～30min.
Specifically, the surface cleaning be processed as surface dirt remove, the one kind in flame plucking or mechanical sandblasting or
It is several.
Specifically, the Surface Polarization be processed as flame polarization process, dielectric impedance normal pressure corona unit polarization process or
One or more in atmospheric low-temperature jet plasma apparatus polarization process.
Specifically, the liquid epoxy coating is double component solvent-free liquid epoxy coating.
Specifically, the application pattern of the liquid epoxy coating is manual brushing or the one kind or two in mechanically spraying
Kind.
Specifically, the liquid epoxy coating applied thickness is 50～2000 μm.
Specifically, during the liquid epoxy coating mode of heating is flame gun heating, heating in medium frequency or infrared heating
One or more.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
The present invention on the basis of polarization process is carried out to three-layer polyethylene coating surface carries out adding to liquid epoxy coating
Heat, improves the solidification temperature of liquid epoxy coating, makes the carboxylic group of polyethylene surface and the epoxide group of liquid epoxy coating
There is chemical reaction at high temperature, form chemical bond, the repaired mouth area that three-layer polyethylene coating is overlapped with epoxy coating is made with chemistry
Key bonds, and so as to not only increase the initial adhesion between repaired mouth overlap three-layer polyethylene coating and epoxy coating, also makes which
Long-term antiseptic property is provided with, the demand of buried long distance pipeline long service is met.
Specific embodiment
For three-layer polyethylene antiseptical buried pipeline, when carrying out preservative treatment to repaired mouth overlap, first to three strata second
Ene coatings surface is cleaned process, then carries out polarization process to three-layer polyethylene coating surface, makes polyethylene obtain surface shape
Into carboxylic group, deposited liquid epoxy coating is repasted so as to evenly spread to three-layer polyethylene coating surface, 50 μm of applied thickness～
2000 μm, finally epoxy coating is heated, the temperature of epoxy coating reaches 110～260 DEG C, and keeps 30s～30min,
Make the carboxylic group of polyethylene surface that chemical reaction occur at high temperature with the epoxide group of liquid epoxy coating, form chemistry
Key, realizes boning with chemical bond between repaired mouth overlap three-layer polyethylene coating and epoxy coating.
The three-layer polyethylene coating surface cleaning is processed in including dust process, flame plucking or mechanical blasting treatment
One or more processing modes.
The three-layer polyethylene coating Surface Polarization is processed includes flame polarization process, dielectric impedance normal pressure corona unit pole
Change process or one or more modes in atmospheric low-temperature plasma jet device polarization process.
The application pattern of the liquid epoxy coating include the one kind in the mode of manual application pattern or mechanically spraying or
Two ways.
The heating of the liquid epoxy coating is using in flame gun heating, heating in medium frequency or infrared heating mode
Plant or several ways.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment to present invention enforcement
Mode is described in further detail.
Embodiment 1
A kind of method for embodiments providing epoxy coating and three-layer polyethylene coating chemical bond bonding, the side
Method is comprised the following steps：
Repaired mouth overlap three-layer polyethylene coating surface dirt is first removed, then stops corona unit to three with atmospheric dielectric
Strata vinyl coating surface carries out polarization process, makes polyethylene obtain surface and forms carboxylic group, finally using manual application pattern
Double component solvent-free liquid epoxy repaired mouth coating, 100 μm of paint thickness are applied on three-layer polyethylene coating surface, and is adopted infrared
Line is heated, and makes the temperature of epoxy coating reach 260 DEG C, is kept 30s, is made the carboxylic group and liquid epoxy coating of polyethylene surface
Epoxide group there is chemical reaction at high temperature, form chemical bond, realize repaired mouth overlap three-layer polyethylene coating and epoxy
Bondd with chemical bond between coating.
Adhesive force of the epoxy coating to polyethylene base material is tested using hubbing, due to there is epoxy cohesional failure, initially
Adhesive force is more than 12Mpa, and after 90 DEG C of high-temperature-hot-waters soak 45 days, adhesive force is more than 6Mpa, and data above explanation is by this
The buried long distance pipeline repaired mouth that the method that embodiment is provided is obtained can undergo the long period of soaking of high-temperature-hot-water, with long-term anti-corrosion
Performance.
Embodiment 2
A kind of method for embodiments providing epoxy coating and three-layer polyethylene coating chemical bond bonding, the method
Including：
Repaired mouth overlap three-layer polyethylene coating surface dirt is removed first, then with atmospheric low-temperature plasma jet device pair
Three-layer polyethylene coating surface carries out polarization process, makes polyethylene obtain surface and forms carboxylic group, finally using manual coating side
Formula applies double component solvent-free liquid epoxy repaired mouth coating, 50 μm of paint thickness on three-layer polyethylene coating surface, and adopts red
Outside line is heated, and makes the temperature of epoxy coating reach 200 DEG C, is kept 5min, is made the carboxylic group and liquid epoxy of polyethylene surface
There is chemical reaction in the epoxide group of coating, form chemical bond at high temperature, realize repaired mouth overlap three-layer polyethylene coating with
Bondd with chemical bond between epoxy coating.
Adhesive force of the epoxy coating to polyethylene base material is tested using hubbing, due to there is epoxy cohesional failure, initially
Adhesive force is more than 15Mpa, and after 90 DEG C of high-temperature-hot-waters soak 45 days, adhesive force is more than 6Mpa, and data above explanation is by this
The buried long distance pipeline repaired mouth that the method that embodiment is provided is obtained can undergo the long period of soaking of high-temperature-hot-water, with long-term anti-corrosion
Performance.
Embodiment 3
A kind of method for embodiments providing epoxy coating and three-layer polyethylene coating chemical bond bonding, the method
Including：
Blasting treatment is carried out to repaired mouth overlap three-layer polyethylene coating surface first, then three-layer polyethylene is applied with flame
Layer surface carries out polarization process, makes polyethylene obtain surface and forms carboxylic group, finally in three strata second in the way of mechanically spraying
Ene coatings surface applies double component solvent-free liquid epoxy repaired mouth coating, 650 μm of paint thickness, and is heated using flame gun,
Make the temperature of epoxy coating reach 140 DEG C, keep 7min, make the carboxylic group of polyethylene surface and the epoxy of liquid epoxy coating
There is chemical reaction in group, form chemical bond at high temperature, realize repaired mouth overlap three-layer polyethylene coating and epoxy coating it
Between with chemical bond bond.
Adhesive force of the epoxy coating to polyethylene base material is tested using hubbing, due to there is epoxy cohesional failure, initially
Adhesive force is more than 12Mpa, and after 90 DEG C of high-temperature-hot-waters soak 30 days, adhesive force is more than 7Mpa, illustrates what the present embodiment was provided
Method enables buried long distance pipeline repaired mouth to undergo the long period of soaking of high-temperature-hot-water, it is ensured that long-term antiseptic property.
Embodiment 4
A kind of method for embodiments providing epoxy coating and three-layer polyethylene coating chemical bond bonding, the method
Including：
Repaired mouth overlap three-layer polyethylene coating surface dirt is first removed, is then filled with atmospheric low-temperature plasma jet device
Putting carries out polarization process to three-layer polyethylene coating surface, makes polyethylene obtain surface and forms carboxylic group, finally using manual painting
Application mode three-layer polyethylene coating surface apply double component solvent-free liquid epoxy repaired mouth coating, 2000 μm of paint thickness, and
Using heating in medium frequency, make the temperature of epoxy coating reach 70 DEG C, keep 30min, make the carboxylic group and liquid of polyethylene surface
There is chemical reaction in the epoxide group of epoxy coating, form chemical bond at high temperature, realize that repaired mouth overlap three-layer polyethylene is applied
Bondd with chemical bond between layer and epoxy coating.
Adhesive force of the epoxy coating to polyethylene base material is tested using hubbing, due to there is epoxy cohesional failure, initially
Adhesive force is more than 14Mpa, and after 90 DEG C of high-temperature-hot-waters soak 45 days, adhesive force is more than 5Mpa, illustrates what the present embodiment was provided
Method enables buried long distance pipeline repaired mouth to undergo the long period of soaking of high-temperature-hot-water, it is ensured that long-term antiseptic property.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (7)
1. a kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond, it is characterised in that methods described includes：Will
After three-layer polyethylene coating surface is cleaned process and polarization process, liquid epoxy coating is applied, and is heated to 140～260
DEG C, keep 30s～30min.
2. the method for claim 1, it is characterised in that the surface cleaning is processed as that surface dirt is removed, flame draws
One or more in hair or mechanical sandblasting.
3. the method for claim 1, it is characterised in that the Surface Polarization is processed as flame polarization process, medium resistance
One or more in gear normal pressure corona unit polarization process or atmospheric low-temperature jet plasma apparatus polarization process.
4. the method for claim 1, it is characterised in that the liquid epoxy coating is double component solvent-free liquid epoxy
Coating.
5. the method for claim 1, it is characterised in that the application pattern of the liquid epoxy coating be manual brushing or
One or two in person's mechanically spraying.
6. the method for claim 1, it is characterised in that the liquid epoxy coating applied thickness is 50～2000 μm.
7. the method for claim 1, it is characterised in that the liquid epoxy coating mode of heating adds for flame gun
One or more in heat, heating in medium frequency or infrared heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310097379.8A CN104072793B (en) | 2013-03-25 | 2013-03-25 | A kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310097379.8A CN104072793B (en) | 2013-03-25 | 2013-03-25 | A kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond |
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| Publication Number | Publication Date |
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| CN104072793A CN104072793A (en) | 2014-10-01 |
| CN104072793B true CN104072793B (en) | 2017-04-05 |
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| CN201310097379.8A Active CN104072793B (en) | 2013-03-25 | 2013-03-25 | A kind of method that epoxy coating is bondd with three-layer polyethylene coating chemical bond |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112013206A (en) * | 2020-09-05 | 2020-12-01 | 青岛罗宝节能科技有限公司 | Anticorrosion method for pipeline joint and anticorrosion pipeline |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997517A (en) * | 1997-01-27 | 1999-12-07 | Sts Biopolymers, Inc. | Bonding layers for medical device surface coatings |
| CN101163821A (en) * | 2005-04-21 | 2008-04-16 | 超科有限公司 | Bondably coated metallic member |
| CN102705633A (en) * | 2012-05-31 | 2012-10-03 | 山东胜利钢管有限公司 | High shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and manufacturing process thereof |
-
2013
- 2013-03-25 CN CN201310097379.8A patent/CN104072793B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997517A (en) * | 1997-01-27 | 1999-12-07 | Sts Biopolymers, Inc. | Bonding layers for medical device surface coatings |
| CN101163821A (en) * | 2005-04-21 | 2008-04-16 | 超科有限公司 | Bondably coated metallic member |
| CN102705633A (en) * | 2012-05-31 | 2012-10-03 | 山东胜利钢管有限公司 | High shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and manufacturing process thereof |
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| CN104072793A (en) | 2014-10-01 |
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Effective date of registration: 20170503 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Patentee after: China National Petroleum Corporation Co-patentee after: China Petroleum & natural gas pipeline Science Research Institute Co Ltd Address before: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee before: China Petroleum and Natural Gas Pipeline Bureau Patentee before: China National Petroleum Corporation |
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