CN112728283A - Method for repairing mouth of anti-corrosion pipeline - Google Patents
Method for repairing mouth of anti-corrosion pipeline Download PDFInfo
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- CN112728283A CN112728283A CN202011605696.2A CN202011605696A CN112728283A CN 112728283 A CN112728283 A CN 112728283A CN 202011605696 A CN202011605696 A CN 202011605696A CN 112728283 A CN112728283 A CN 112728283A
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- layer
- anticorrosion
- auxiliary layer
- pipeline
- corrosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/109—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being an extruded layer
Abstract
The invention discloses an anticorrosive pipeline joint coating method, which comprises the following steps: s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the steel pipeline anticorrosion layer along the axial direction; and S2, performing joint coating on the welding joint by using joint coating materials. According to the method for repairing the opening of the anti-corrosion pipeline, the anti-corrosion auxiliary layer can be integrated with PE or PP on the outermost layer of the 3LPE or 3LPP in a hot melting mode, and has good compatibility and adhesion with different opening repairing materials, the defects that different opening repairing materials are difficult to fuse with PE or PP on the outermost layer of the 3LPE or 3LPP and the opening repairing is prone to failure can be effectively overcome, long-term stable adhesion of the opening repairing materials and the 3LPE or 3LPP is achieved, and the service life of the anti-corrosion pipeline is prolonged.
Description
Technical Field
The invention relates to the technical field of outer layer corrosion prevention of oil and gas transmission pipelines, in particular to a joint coating method of a corrosion-resistant pipeline.
Background
Steel pipes used in oil and gas pipelines are usually buried underground for a long time, and the external corrosion resistance of the steel pipes must be considered to ensure long service life of the steel pipes. The outer layer of the pipeline is coated with three polyethylene anticorrosive layers (3LPE) or three polypropylene anticorrosive layers (3LPP) to form an anticorrosive pipeline, which is a common anticorrosive mode of the pipeline. The 3LPE or 3LPP is a three-layer structure, wherein the outermost layer is PE or PP respectively. At the pipeline job site of anticorrosive pipeline, need pass through welded connection between many anticorrosive pipelines, because the anticorrosive coating that part anticorrosive pipeline port position can be ground off in the welding, expose the steel pipeline top layer, through the welding completion after, still need be in the welding mouthful position, mend the mouth to the welding mouthful. The joint coating method is to cover and bond the joint coating material on the end part of the steel pipeline anticorrosive coating and the welding joint, so as to play a role in sealing and connecting, and improve the anticorrosive effect of the pipeline. The joint coating effect has great influence on the integral corrosion resistance of the pipeline, if the on-site joint coating effect is not good, the part near a welding joint can be seriously corroded, the service life of the buried pipeline is shortened, and even serious consequences such as leakage are caused.
The existing anti-corrosion pipeline is mainly repaired by using joint materials such as heat shrinkable sleeves (belts), polyolefin materials, liquid epoxy or polyurethane, polyurea and the like. Although the operation of the joint coating mode is simple, the compatibility between the matrix resin of the joint coating material and the PE or PP on the outermost layer of the 3LPE or 3LPP anticorrosive layer is poor, or the difference between the polarity, the viscosity and the melting point is too large, so that firm bonding is difficult to realize, and the joint coating failure problem frequently occurs.
For example, when a heat shrinkable sleeve (belt) is used as a joint coating material, although the joint coating is simple to operate and efficient to construct, the hot melt adhesive used by the heat shrinkable sleeve (belt) has strong polarity, low melting point and low molecular weight, is not well compatible with PE or PP, has small elastic shrinkage force when the cross-linked polyethylene substrate is heated, has limited pressure applied to the hot melt adhesive, cannot form reliable bonding between the hot melt adhesive and an anticorrosive coating, and is easy to generate a debonding phenomenon after being buried in the ground, so that the joint coating fails. When the polyolefin material is used as the joint coating material, the matrix resin is polyolefin, although the polyolefin has similar polarity with PE or PP and good compatibility, the joint coating material and the PE or PP layer cannot realize real fusion, and recrystallization and phase separation are easy to occur when the temperature is reduced, so that joint coating failure is caused.
Therefore, it is necessary to develop a method for repairing the opening of the anti-corrosion pipeline, so that the opening repairing material can be firmly bonded with the anti-corrosion layer of the pipeline.
Disclosure of Invention
The invention provides an anticorrosive pipeline joint coating method for overcoming the defect that 3LPE or 3LPP and joint coating materials are difficult to bond firmly in the prior art, and the anticorrosive pipeline joint coating method can realize long-term stable bonding of the joint coating materials and the 3LPE or 3LPP and prolong the service life of an anticorrosive pipeline.
In order to solve the technical problems, the invention adopts the technical scheme that:
an anticorrosive pipeline joint coating method comprises the following steps:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the steel pipeline anticorrosion layer along the axial direction;
and S2, performing joint coating on the welding joint by using joint coating materials.
The inventor researches and discovers that the defects that different joint coating materials and PE or PP on the outermost layer of the 3LPE or 3LPP are difficult to fuse and the joint coating is easy to lose efficacy can be effectively overcome by arranging the anticorrosion auxiliary layer at the end part of the surface layer of the anticorrosion layer of the steel pipeline along the axial direction, then using the conventional joint coating materials for joint coating, and covering and bonding the joint coating materials on the end part and the welding joint part of the anticorrosion layer of the steel pipeline with the anticorrosion auxiliary layer.
The raw material of the anticorrosion auxiliary layer comprises a first component and a second component;
the first component is resin which is the same as the matrix resin of the surface layer of the anticorrosive layer of the steel pipeline,
the second component is a material capable of reacting with the patch material to form a chemical bond, or a resin identical to the matrix resin of the patch material.
Preferably, the first component is PE or PP.
At present, the common corrosion prevention mode of the steel pipeline is that a 3LPE or 3LPP corrosion prevention layer is arranged on the outer layer of the pipeline, the 3LPE or 3LPP is of a three-layer structure, and the surface layer matrix resin is PE or PP respectively. Therefore, the first component is PE or PP, and can be thermally fused with the surface layer of the 3LPE or 3LPP anticorrosive layer.
Preferably, the second component is one of EVA, monomer-olefin copolymer containing anhydride, epoxy, hydroxyl or carboxylic acid groups, polyolefin elastomer, thermoplastic polyurethane elastomer and/or thermoplastic polyamide elastomer.
And a proper second component is selected according to different joint coating materials, and the anticorrosion auxiliary layer and the joint coating materials can be integrally hot-melted in the pipeline construction process.
According to the technical scheme, the anti-corrosion auxiliary layer and the PE or PP on the surface layer of the 3LPE or 3LPP are integrally hot-melted and cannot be integrally separated in a stripping mode; the anticorrosion auxiliary layer has excellent compatibility with the joint coating material, or can form chemical bonds through reaction, so that the joint coating material is firmly bonded, and the problem of poor bonding of 3LPE or 3LPP and the joint coating material is fundamentally solved.
Preferably, the weight ratio of the first component to the second component is (1: 2) to (2: 1).
When the weight of the first component and the second component is within the range, the adhesion effect of the corrosion-resistant auxiliary layer on the 3LPE or 3LPP and the joint coating material is better.
When the patch material is a heat shrinkable sleeve (tape), the second component is preferably Ethylene Vinyl Acetate (EVA).
The base resin of the heat shrinkable sleeve (belt) is EVA, and when the joint coating material is the heat shrinkable sleeve (belt), the second component is EVA. The EVA in the anticorrosion auxiliary layer and the matrix resin of the thermal contraction sleeve (belt) belong to the same material, are completely compatible and can form reliable bonding.
Preferably, the VA content in the EVA is 18-28%.
When the patch material is a liquid epoxy, the matrix resin of the patch material is an epoxy resin, and the second component is preferably an anhydride, epoxy, hydroxyl or carboxylic acid group-containing monomer-olefin copolymer.
The anhydride, epoxy, hydroxyl or carboxylic acid group in the monomer-olefin copolymer containing the anhydride, epoxy, hydroxyl or carboxylic acid group can generate chemical bonds with epoxy resin, so that firm bonding is formed; the olefin component in the monomer-olefin copolymer containing anhydride, epoxy, hydroxyl or carboxylic acid groups promotes the compatibility with PE or PP, so that the anticorrosion auxiliary layer is effectively compatible with the liquid epoxy.
Alternatively, the anhydride, epoxy, hydroxyl or carboxylic acid group containing monomer-olefin copolymer may be:
polyethylene grafted glycidyl methacrylate (PE-GMA), polyolefin elastomer grafted maleic anhydride copolymer (POE-MAH), ethylene vinyl alcohol copolymer (EVOH), and ethylene acrylic acid copolymer (EAA).
When the patch material is a polyolefin, the second component is preferably a polyolefin elastomer.
The polyolefin elastomer and the polyolefin have similar compatibility and the same functional group, can be effectively compatible, and form a chemical bond to firmly bond the anticorrosion auxiliary layer and the joint coating material.
Preferably, the polyolefin elastomer is an ethylene-based elastomer or a propylene-based elastomer.
Optionally, the polyolefin elastomer is an ethylene-propylene elastomer, an ethylene-hexene elastomer, an ethylene-octene elastomer, or a propylene-ethylene elastomer.
When the patch material is polyurethane or polyurea, the second component is preferably a thermoplastic polyurethane elastomer and/or a thermoplastic polyamide elastomer.
The active H in the thermoplastic polyurethane elastomer and the thermoplastic polyamide elastomer can react with isocyanate (main component for curing to form polyurethane or polyurea) to generate chemical bonds, so that the anticorrosion auxiliary layer is firmly bonded with the polyurethane or polyurea.
Preferably, the PE is one or more of LDPE, LLDPE and MDPE; the PP is one or more of homopolymerized PP, block copolymerized PP and random copolymerized PP.
Preferably, the raw material of the corrosion prevention auxiliary layer may further include a compatibilizer.
The addition of the compatilizer can improve the compatibility of the first component and the second component, thereby obviously improving the joint coating and corrosion prevention effects of the joint coating method for the corrosion-resistant pipeline.
Preferably, the compatibilizer is one commonly used in polyolefins.
Optionally, the compatibilizer is a polyolefin elastomer or an anhydride, epoxy, hydroxyl, or carboxylic acid group-containing monomer-olefin copolymer.
Preferably, the anticorrosion auxiliary layer can also comprise an antioxidant, an ultraviolet resistant agent, a pigment and a lubricant.
Optionally, the antioxidant may be 1010, 168.
Optionally, the anti-ultraviolet agent may be 531, 944, 770.
Optionally, the pigment can be carbon black or titanium dioxide.
Alternatively, the lubricant may be calcium stearate, paraffin, white oil.
The width of the anticorrosion auxiliary layer is more than or equal to 50mm, and the thickness of the anticorrosion auxiliary layer is more than or equal to 0.1 mm.
The width and the thickness of the anticorrosion auxiliary layer are important factors influencing the adhesion anticorrosion effect of the repaired mouth. Through a large number of experiments, the inventor finds that if the width of the anticorrosion auxiliary layer is less than 50mm, the possibility that residual bubbles are connected into a channel occurs in the joint repairing process, so that the joint repairing quality is poor, and joint repairing materials are separated and fall off easily; if the thickness of the anticorrosion auxiliary layer is less than 0.1mm, the hot melting layer of the anticorrosion auxiliary layer, the PE, the PP and the joint coating material is too thin, and the sealing and bonding effect is unstable.
Preferably, the width of the anticorrosion auxiliary layer is 50-600 mm, and the thickness of the anticorrosion auxiliary layer is 0.1-2.0 mm.
To a certain extent, along with the width increase, the thickness increase of anticorrosive auxiliary layer, can be so that anticorrosive auxiliary layer and PE or PP bond more firmly to the pipeline anticorrosive effect is better. However, when the width of the anticorrosion auxiliary layer exceeds 600mm or the thickness exceeds 2.0mm, the existing production line needs to be lengthened, the economy is deteriorated, but the anticorrosion effect cannot be improved more obviously.
Preferably, the method for arranging the anticorrosion auxiliary layer comprises the following steps:
and mixing the raw materials of the anticorrosion auxiliary layer, coating the mixture at the port of the surface layer of the anticorrosion layer of the steel pipeline, and performing heat seal melting and rubber roll fixing to obtain the anticorrosion auxiliary layer.
Preferably, the coating is performed by:
the raw materials of the anticorrosion auxiliary layer are mixed, ground into powder and evenly sprayed on the end part of the surface layer of the anticorrosion layer of the steel pipeline;
or the raw materials of the anticorrosion auxiliary layer are mixed and ground into powder, and the powder is placed in a fluidized bed at the lower part of the pipeline and then evenly coated on the end part of the surface layer of the anticorrosion layer of the steel pipeline;
or after the raw materials of the anti-corrosion auxiliary layer are mixed, the mixture is blown into a film by a plastic film blowing machine and is uniformly wound on the end part of the surface layer of the anti-corrosion layer of the steel pipeline;
or after the raw materials of the anti-corrosion auxiliary layer are mixed, the mixture is laterally extruded and wound on the end part of the surface layer of the anti-corrosion layer of the steel pipeline.
Preferably, the temperature of the heat seal melting is 200-240 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention has developed a anticorrosion pipeline repaired mouth method, through setting up the anticorrosive auxiliary coating axially in the end of the steel pipeline anticorrosive coating surface layer; and then, repairing the welding port by using a repairing material. The anticorrosion auxiliary layer can be integrated with PE or PP on the outermost layer of the 3LPE or the 3LPP in a hot melting mode, and the anticorrosion auxiliary layer and different joint coating materials have good compatibility and adhesion, so that the defects that the different joint coating materials are difficult to fuse with the PE or PP on the outermost layer of the 3LPE or the 3LPP and are easy to joint coating failure can be effectively overcome, long-term stable bonding of the joint coating materials and the 3LPE or the 3LPP is realized, and the service life of an anticorrosion pipeline is prolonged.
Drawings
Fig. 1 is a schematic cross-sectional structure view of an anticorrosion steel pipe provided with an anticorrosion auxiliary layer in example 1.
Fig. 2 is a schematic top view of the corrosion-resistant steel pipe provided with the corrosion-resistant auxiliary layer in example 1.
In the figure: 1 is a steel pipeline; 2 is 3LPE anticorrosive coating; and 3, an anticorrosion auxiliary layer.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The starting materials in the examples and comparative examples are all commercially available:
reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Examples 1 to 22
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the steel pipeline anticorrosion layer along the axial direction;
s2, performing joint coating on the welding joint by using a joint coating material;
the joint material of the embodiments 1 to 4 and 22 is a heat shrinkable sleeve, the joint material of the embodiments 5 to 10 is liquid epoxy, the joint material of the embodiments 11 to 14 is polyolefin, and the joint material of the embodiments 15 to 21 is polyurethane; wherein the raw material components of the anticorrosion auxiliary layer are shown in the table 1.
TABLE 1 raw material component contents (parts by weight) of anticorrosive auxiliary layers of examples 1 to 22
In embodiments 1 to 3, 5 to 10, 12 to 13, and 15 to 21, the steel pipeline anticorrosive coating is a 3LPE anticorrosive coating, and the method for providing the anticorrosive auxiliary coating includes the steps of:
mixing the raw materials of the anticorrosion auxiliary layer, grinding the mixture into powder by a grinding machine, uniformly spraying the powder on the end part of the surface layer of the 3LPE anticorrosion layer, and performing heat seal melting and rubber roller compaction at 200-240 ℃ to obtain the anticorrosion auxiliary layer;
the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 2 mm.
In embodiments 4, 11, 14, and 22, the steel pipe anticorrosive coating is a 3LPP anticorrosive coating, and the method for providing the anticorrosive auxiliary coating includes the steps of:
mixing the raw materials of the anticorrosion auxiliary layer, grinding the mixture into powder by a grinding machine, uniformly spraying the powder on the end part of the surface layer of the 3LPP anticorrosion layer, and performing heat seal melting and rubber roller compaction at 200-240 ℃ to obtain the anticorrosion auxiliary layer;
the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 2 mm.
The cross-sectional structural schematic view of the corrosion-resistant steel pipe provided with the corrosion-resistant auxiliary layer in example 1 is shown in fig. 1, and the top view structural schematic view is shown in fig. 2; in the figure, 1 is a steel pipeline, 2 is a 3LPE anticorrosive coating, and 3 is an anticorrosive auxiliary coating.
The 3LPE anticorrosive coating coats in the steel pipeline outer, and anticorrosive auxiliary layer sets up in the tip on 3LPE anticorrosive coating top layer, and the width is 600mm, and thickness is 2 mm.
Example 23
Embodiment 23 provides a method for repairing a corrosion-resistant pipeline, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the setting method of the anticorrosion auxiliary layer comprises the following steps:
mixing the raw materials of the anticorrosion auxiliary layer, grinding the mixture into powder by a grinding mill, placing the powder in a fluidized bed at the lower part of a pipeline, and uniformly coating the powder on the end part of the surface layer of the anticorrosion layer of the steel pipeline; obtaining an anticorrosion auxiliary layer by heat-seal melting at 200-240 ℃ and compaction of a rubber roller;
the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 2 mm.
Example 24
Embodiment 24 provides a method for repairing a corrosion resistant pipe, including the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the setting method of the anticorrosion auxiliary layer comprises the following steps:
mixing the raw materials of the anticorrosion auxiliary layer, blowing the mixture into a film by a plastic film blowing machine, uniformly winding the film on the end part of the surface layer of the anticorrosion layer of the steel pipeline, and performing heat seal melting and rubber roller compaction at 200-240 ℃ to obtain the anticorrosion auxiliary layer;
the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 2 mm.
Example 25
Embodiment 25 provides a method for repairing a corrosion resistant pipe, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the setting method of the anticorrosion auxiliary layer comprises the following steps:
mixing the raw materials of the anticorrosion auxiliary layer, laterally extruding and winding the mixture on the end part of the surface layer of the 3LPE anticorrosion layer, and performing heat seal melting at 200-240 ℃ and compaction by using a rubber roller to obtain the anticorrosion auxiliary layer;
the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 2 mm.
Example 26
Embodiment 26 provides a method for repairing a corrosion resistant pipe, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the method for arranging the anticorrosion auxiliary layer is different from that of the embodiment 1 in that: the width of the anticorrosion auxiliary layer is 400mm, and the thickness is 1.3 mm.
Example 27
Embodiment 27 provides a method for repairing a corrosion resistant pipe, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the method for arranging the anticorrosion auxiliary layer is different from that of the embodiment 1 in that: the width of the anticorrosion auxiliary layer is 180mm, and the thickness is 0.6 mm.
Example 28
Embodiment 28 provides a method of repairing a port of an anti-corrosion pipeline, comprising:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the method for arranging the anticorrosion auxiliary layer is different from that of the embodiment 1 in that: the width of the anticorrosion auxiliary layer is 50mm, and the thickness is 0.1 mm.
Example 29
Embodiment 29 provides a method for repairing a corrosion resistant pipe, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
the anticorrosive auxiliary layer comprises the following raw materials in parts by weight: 30 parts of PP, 60 parts of EVA, 30 parts of propylene-ethylene elastomer, 10100.5 parts of antioxidant, 3 parts of carbon black and 0.3 part of calcium stearate.
Example 29 the method of disposing the corrosion prevention auxiliary layer was the same as in example 1.
Comparative example 1
Comparative example 1 provides a method for repairing a port of an anticorrosive pipeline, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the method for arranging the anticorrosion auxiliary layer is different from that of the embodiment 1 in that: the width of the anticorrosion auxiliary layer is 30mm, and the thickness is 2 mm.
Comparative example 2
Comparative example 2 provides an anticorrosive pipeline joint coating method, including the following steps:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
wherein, the content of each component of the raw material of the anticorrosion auxiliary layer is the same as that of the raw material of the embodiment 1;
the method for arranging the anticorrosion auxiliary layer is different from that of the embodiment 1 in that: the width of the anticorrosion auxiliary layer is 600mm, and the thickness is 0.05 mm.
Comparative example 3
Comparative example 3 provides a method for repairing a corrosion-resistant pipeline, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
the anticorrosive auxiliary layer comprises the following raw materials in parts by weight: 60 parts of EVA and 30 parts of ethylene-octene elastomer.
Comparative example 3 the method of disposing the corrosion prevention auxiliary layer was the same as in example 1.
Comparative example 4
Comparative example 4 provides a method for repairing a corrosion-resistant pipeline, comprising the steps of:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the 3LPE anticorrosion layer of the steel pipeline along the axial direction;
s2, mending a welded joint by using a heat shrinkable sleeve mending material;
the anticorrosive auxiliary layer comprises the following raw materials in parts by weight: 60 parts of PE and 30 parts of ethylene-octene elastomer.
The method of disposing the corrosion prevention auxiliary layer of comparative example 4 is the same as that of example 1.
Comparative example 5
Comparative example 5 provides a method for repairing a corrosion-resistant pipeline, comprising the steps of:
s1, a welded joint of the surface layer of the 3LPE anticorrosive layer of the steel pipeline is repaired by using a heat shrinkable sleeve joint repairing material.
Performance testing
The joint repairing effects of the above examples and comparative examples were subjected to performance tests.
When the joint coating material is a heat shrinkable sleeve or polyolefin, detecting the peeling strength between the anticorrosive layer and the anticorrosive auxiliary layer of the steel pipeline and the peeling strength between the anticorrosive auxiliary layer and the joint coating material, wherein the unit is N/cm; the peel strength test method is based on GB/T23257-2017 standard, and the detection temperature is normal temperature.
When the joint coating material is liquid epoxy or polyurethane or polyurea, detecting the peeling strength between the anticorrosive coating and the anticorrosive auxiliary layer of the steel pipeline, wherein the unit is N/cm; the peel strength test method is based on GB/T23257-2017, and the detection temperature is normal temperature; and testing the adhesion strength between the anticorrosion auxiliary layer and the joint coating material in MPa according to an ASTM D4541 method and an Elcometer106 drawing tester at normal temperature.
The test results of examples 1 to 29 are shown in Table 2, and the test results of comparative examples 1 to 5 are shown in Table 3.
TABLE 2 test results of examples 1 to 29
According to the test results of the embodiments 1 to 29, no matter the steel pipeline is a 3LPE anticorrosive coating or a 3LPP anticorrosive coating, for different joint coating materials such as a heat shrinkable sleeve, liquid epoxy, polyolefin or polyurethane, by using the joint coating method of the present invention, the steel pipeline anticorrosive coating and the anticorrosive auxiliary layer, and the anticorrosive auxiliary layer and the joint coating material are firmly bonded, the anticorrosive auxiliary layer can be integrated with PE or PP of the outermost layer of the 3LPE or 3LPP by hot melting, and the anticorrosive auxiliary layer and the different joint coating materials have good compatibility and adhesiveness.
According to the embodiment 1 and the embodiments 23 to 25, different coating modes are adopted, the anticorrosion auxiliary layer can be firmly bonded with the steel pipeline anticorrosion layer and the joint coating material, and the joint coating effect and the anticorrosion effect can be effectively improved.
It can be seen from examples 26 to 29 that the width and thickness of the auxiliary anticorrosion layer greatly affect the adhesion of the auxiliary anticorrosion layer. The larger the width and the larger the thickness of the corrosion-prevention auxiliary layer, the stronger the adhesion, and the higher the peel strength or adhesion strength. The width of the anticorrosion auxiliary layer is 50mm, when the thickness of the anticorrosion auxiliary layer is 0.1mm, the peel strength between the anticorrosion layer of the steel pipeline and the anticorrosion auxiliary layer is more than 200N/cm, the peel strength between the anticorrosion auxiliary layer and the joint coating material is more than 200, and the peel strength between the anticorrosion auxiliary layer and the joint coating material is 100-150N/cm, so that the effect of firm bonding is achieved. The width of the anticorrosion auxiliary layer is preferably 50-600 mm, and the thickness is preferably 0.1-2 mm.
TABLE 3 test results for comparative examples 1 to 5
In comparative example 1, the width of the corrosion prevention auxiliary layer was too narrow, and was only 30 mm; in comparative example 2, the thickness of the anticorrosion auxiliary layer is too small, and is 0.05 mm; the steel pipeline anticorrosive coatings and the anticorrosive auxiliary layers of the comparative examples 1-2 have lower peel strength and cannot meet the requirement of firm bonding.
Comparative example 3 the raw materials of anticorrosive auxiliary layer do not contain first component, and comparative example 4 the raw materials of anticorrosive auxiliary layer do not contain the second component, and anticorrosive auxiliary layer can't reach higher peel strength simultaneously with steel pipeline anticorrosive coating and joint coating material, has the risk of joint coating inefficacy promptly.
Comparative example 5 a conventional joint coating method was used, and a joint coating material was directly used to joint the 3LPE anticorrosive coating of the steel pipe without an anticorrosive auxiliary layer. The peeling strength between the steel pipeline anticorrosive coating and the joint coating material is too low, and is only 70-100N/cm, and the joint coating material is easy to fall off, so that the joint coating fails to work, and the pipeline anticorrosive effect is influenced.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An anticorrosive pipeline joint coating method is characterized by comprising the following steps:
s1, arranging an anticorrosion auxiliary layer at the end part of the surface layer of the steel pipeline anticorrosion layer along the axial direction;
and S2, performing joint coating on the welding joint by using joint coating materials.
2. A patching method as claimed in claim 1, wherein the raw material of the corrosion protection auxiliary layer comprises a first component and a second component;
the first component is resin which is the same as the matrix resin of the surface layer of the anticorrosive layer of the steel pipeline,
the second component is a material capable of reacting with the patch material to form a chemical bond, or a resin identical to the matrix resin of the patch material.
3. A patch method according to claim 2, wherein said first component is PE or PP.
4. The patching method of claim 2, wherein the second component is one of EVA, monomer-olefin copolymers containing anhydrides, epoxies, hydroxyl or carboxylic acid groups, polyolefin elastomers, thermoplastic polyurethane elastomers and/or thermoplastic polyamide elastomers.
5. The patching method of claim 2, wherein the weight ratio of the first component to the second component is (1: 2) - (2: 1).
6. A patch method according to claim 2, wherein the raw material of the corrosion protection auxiliary layer further comprises a compatibilizer.
7. The patching method of claim 1, wherein the anti-corrosion auxiliary layer has a width of more than or equal to 50mm and a thickness of more than or equal to 0.1 mm.
8. The opening repairing method according to claim 7, wherein the corrosion prevention auxiliary layer has a width of 50 to 600mm and a thickness of 0.1 to 2.0 mm.
9. A joint coating method according to claim 1, wherein the method for providing the corrosion prevention auxiliary layer comprises the steps of: and mixing the raw materials of the anticorrosion auxiliary layer, coating the mixture at the port of the surface layer of the anticorrosion layer of the steel pipeline, and performing heat seal melting and rubber roll fixing to obtain the anticorrosion auxiliary layer.
10. A patch method according to claim 9, wherein said coating is applied by:
the raw materials of the anticorrosion auxiliary layer are mixed and ground into powder, and the powder is uniformly sprayed on the end part of the surface layer of the anticorrosion layer of the steel pipeline;
or the raw materials of the anticorrosion auxiliary layer are mixed and ground into powder, and the powder is placed in a pipeline fluidized bed and then evenly coated on the end part of the surface layer of the anticorrosion layer of the steel pipeline;
or the raw materials of the anticorrosion auxiliary layer are mixed and blown into a film which is uniformly wound on the end part of the surface layer of the anticorrosion layer of the steel pipeline;
or after the raw materials of the anti-corrosion auxiliary layer are mixed, the mixture is laterally extruded and wound on the end part of the surface layer of the anti-corrosion layer of the steel pipeline.
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| WO2023017267A1 (en) | 2021-08-10 | 2023-02-16 | The University Court Of The University Of Edinburgh | Method for joining thermoplastic articles |
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