CN111022820A - Lining pipe for stainless steel pipeline repair and repair process - Google Patents
Lining pipe for stainless steel pipeline repair and repair process Download PDFInfo
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- CN111022820A CN111022820A CN201911318980.9A CN201911318980A CN111022820A CN 111022820 A CN111022820 A CN 111022820A CN 201911318980 A CN201911318980 A CN 201911318980A CN 111022820 A CN111022820 A CN 111022820A
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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
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
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Abstract
The invention provides a lining pipe for stainless steel pipeline repair and a repair process, the lining pipe comprises an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb type resin layer and an outer non-woven fabric layer which are sequentially arranged from inside to outside, wherein bonding layer connection is arranged among the layers, the sum of the thicknesses of the composite fiber felt layer and the honeycomb type resin layer accounts for 70-85% of the thickness of the lining pipe, and the thickness ratio of the composite fiber felt layer to the honeycomb type resin layer is 1: 0.4-0.6; the inner non-woven fabric layer adopts terylene/polypropylene filament geotextile with the weight of 600-; the outer non-woven fabric layer adopts polyester spun-bonded short-filament geotextile with the weight of 800 and 850 g; the thickness of the bonding layer is 0.1-0.3 mm; according to the invention, through reasonable interlayer design and raw material selection, the physical and chemical properties of the prepared lining pipe are obviously improved, the performance is stable, the interlayer transition connectivity is strong, the combination effect with the pipeline is good, the qualified rate of the repaired pipeline performance reaches 100%, the effective service life is improved by more than 2.6 times compared with the original pipeline, and the lining pipe is worthy of popularization and application.
Description
Technical Field
The invention relates to the technical field of stainless steel pipelines, in particular to a lining pipe for repairing a stainless steel pipeline and a repairing process.
Background
In recent years, with the development of western development work in China, domestic pipeline construction also meets the peak period, and from the beginning of the western-east gas transportation project in 2001, the installation and construction of domestic pipelines begin to be close to the international level, so that the pipeline has the directional development of large caliber, high strength and high pressure.
The stainless steel pipe is a hollow long-strip round steel material, and is mainly widely used for industrial conveying pipelines, mechanical structural parts and the like of petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and the like. In addition, since the steel sheet is light in weight when it is bent and has the same torsional strength, it is widely used for manufacturing machine parts and engineering structures.
In urban or industrial pipeline systems, ageing and leakage of some old pipelines occur due to the fact that the old pipelines are close to design age limit, geological settlement, ground buildings, surface plants and the like, if overall excavation replacement and repair are adopted, a lot of unpredictable difficulties can be met, such as the fact that the ground buildings and closed roads on the pipelines influence traffic, conflict of other crossed pipelines, long construction period, high cost and the like, the existing internationally leading method is various non-excavation repair technologies, and the method has the remarkable characteristics of short construction period, small temporary occupied area, safety, reliability, no obstruction to traffic and surrounding environment and the like.
The trenchless lining turning technology of the pipeline is characterized in that under the condition that the earth surface is not excavated, a lining material is made of textile fiber materials, the outer surface of the lining material is coated with an impermeable film, and the inner surface of the lining material is impregnated with bonding resin; then, the lining material is lined on the inner wall of the pipeline in a pipe-in-pipe mode and bonded on the inner wall of the pipeline by using air pressure or water pressure through an overturning method, and the resin is cured under a certain pressure and a normal temperature or heating condition to form a tubular textile composite material with a smooth inner wall, so that the protection and repair of the damaged pipeline are completed.
Composite repair techniques have unique, irreplaceable advantages over traditional methods: 1) the transportation of the pipeline is not influenced during the repair period, and the continuous production can be realized; 2) the cost can be saved by 40-50%; 3) the transportation capacity of the pipeline is not affected after the repair; 3) the installation is easy, the operation is simple, and special equipment is not needed; 5) the installation is quick, and generally does not exceed 2 h; 6) the environmental adaptability is strong.
At present, in order to adapt to pipeline application under the different environment, the pipeline inside lining is indispensable, and general nonrust steel pipe all can set up the inside lining, and how to guarantee the excellent combination between inside lining layer and the pipeline body and the mechanical properties requirement of restoreing back pipeline is the key problem of this technique.
Disclosure of Invention
Aiming at the existing problems, the invention provides the lining pipe for stainless steel pipeline repair and the repair process, through reasonable interlayer design and raw material selection, the physical and chemical properties of the prepared lining pipe are obviously improved, the performance is stable, the interlayer transition connectivity is strong, the combination effect with the pipeline is good, the performance qualification rate of the repaired pipeline reaches 100%, the effective service life is improved by more than 2.6 times compared with the original pipeline, and the lining pipe is worthy of popularization and application.
In order to achieve the above object, the present invention adopts the following technical solutions:
an inner lining pipe for stainless steel pipeline repair comprises an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb resin layer and an outer non-woven fabric layer which are sequentially arranged from inside to outside, wherein bonding layers are arranged among the layers for connection, wherein,
the sum of the thicknesses of the composite fiber felt layer and the honeycomb type resin layer is 40-60% of the thickness of the lining pipe, and the thickness ratio of the composite fiber felt layer to the honeycomb type resin layer is 1: 0.4-0.6;
the inner non-woven fabric layer adopts terylene/polypropylene filament geotextile with the weight of 600-; the terylene and the polypropylene fiber are mixed according to the proportion of 1:1, blending;
the outer non-woven fabric layer adopts polyester spun-bonded short-filament geotextile with the weight of 800 and 850 g;
the thickness of the single-layer bonding layer is 0.1-0.2 mm.
As a further optimization of the invention, an inner protective film layer is also arranged in the inner non-woven fabric layer, the inner protective film layer adopts epoxy resin sealant, and the thickness of the inner protective film layer is 0.2-0.3 mm. The epoxy sealant can be prepared by purchasing conventional products in the market, and the product of Shenzhen Chengyikang adhesive Limited company or Dongguan adhesive product Limited company is selected.
As a further optimization of the invention, the composite fiber felt layer adopts a glass fiber/carbon fiber composite material; the honeycomb type resin layer is made of polyurethane modified epoxy acrylate, and the bonding layer is made of epoxy acrylate resin/ABS modified composite material.
As further optimization of the invention, the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth and unidirectional carbon fiber/unidirectional glass fiber blended cloth (the mass content ratio of carbon fiber to glass fiber is 1:0.7, the mass ratio is most preferable for ensuring excellent combination between layers due to different physical properties of carbon fiber and glass fiber and larger difference of contraction and expansion, thereby effectively ensuring smooth transition connection of the combination of the two materials and effectively improving rigidity and flexibility), and the three types of cloth are overlapped and connected through impregnated glue layers;
specifically, the unidirectional carbon fiber cloth is provided with two layers which are respectively arranged on an upper outer side layer and a lower outer side layer, the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth are alternately arranged between the upper unidirectional carbon fiber cloth and the lower unidirectional carbon fiber cloth, the unidirectional carbon fiber/unidirectional glass fiber blended cloth is contacted with the unidirectional carbon fiber cloth, and the sum of the laying layers of the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth is 3 layers or 5 layers.
The preparation method of the honeycomb type resin layer is that a proper amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer are taken, filler is added into the mixture under the condition of stirring, ultrasonic treatment is carried out for 15min (25-28KHz) at the temperature of 60 ℃, then diluent, initiator, catalyst and accelerant are added into the mixture, heating reaction is carried out for 1-3h at the temperature of 70-90 ℃, the mixture is led into a corresponding honeycomb type die cavity in a thermal gelation state, curing molding is carried out, and the porosity of the molded honeycomb type resin layer is 55-62%.
The invention is further optimized, the filler in the honeycomb type resin layer is nano-scale talcum powder, the diluent is an MMA and GMA composition with the mass ratio of 1:0.5, the initiator is dibenzoyl peroxide and benzoin methyl ether with the mass ratio of 1:0-1, the catalyst is tetramethylammonium chloride, and the accelerator is cobalt naphthenate; the honeycomb type resin layer comprises, by mass, 16-22% of bisphenol F epoxy acrylate prepolymer, 15-25% of polyurethane prepolymer, 2-7% of filler, 0.5-2% of initiator, 0.5-1% of catalyst, 0.5-2% of accelerator and the balance of diluent.
The preparation method of the adhesive layer is that a proper amount of epoxy acrylate resin and ABS resin are taken, a proper amount of filler, coupling agent, active diluent, initiator and accelerator are added into the epoxy acrylate resin and the ABS resin, the epoxy acrylate resin and the ABS resin are uniformly mixed, cured and crushed into particles, and the particle size of the particles is 0.5-3 mm. When in use, the granular materials are hot-melted, sprayed and coated.
As further optimization of the invention, the filling agent is hollow glass microspheres, the coupling agent is KH-550, the active diluent is 1, 6-hexanediol diacrylate, the initiator is a dioctyl phthalate mixture containing 55 wt% of dibenzoyl peroxide, and the accelerator is cobalt naphthenate; the adhesive layer comprises, by mass, 20-27% of epoxy acrylate resin, 8-15% of ABS resin, 2.5-4% of filler, 2-5% of coupling agent, 0.5-2% of initiator, 0.5-2% of accelerator and the balance of diluent.
A stainless steel pipeline repairing process based on a flexible lining pipe, wherein the flexible lining pipe adopts the lining pipe for stainless steel pipeline repairing of any one of claims 3-7.
A stainless steel pipeline repairing process based on a flexible lining pipe comprises the following steps:
1) taking raw materials of an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb type resin layer, an outer non-woven fabric layer and a bonding layer, sequentially stacking the inner non-woven fabric layer, the composite fiber felt layer, the honeycomb type resin layer and the outer non-woven fabric layer, placing the bonding layer raw materials between the layers, and performing hot press molding to obtain a sheet;
2) coating a protective film layer on one surface of the sheet, drying, rolling the sheet into a tubular shape by sewing edges to obtain a lining tube blank tube, wherein the width of the sewing area of the lining tube blank tube is 10-20% of the inner diameter of the tube body, and the protective film layer is positioned on the inner wall side of the tube body;
3) positioning and excavating a to-be-repaired stainless pipe, cutting and removing part of the original pipe, cleaning and performing surface treatment to ensure that the cut and the inner and outer walls of the pipe are smooth and free of impurities;
4) inserting the lining pipe blank pipe into the original pipeline, sealing two ends, expanding the pipe by using water pressure or air pressure, then sealing two ends of the lining pipe blank pipe and the original pipeline, vacuumizing the interlayer, injecting a bonding layer material of thermal gel into the interlayer, curing after the interlayer is filled, and then carrying out performance detection on the formed lining-containing pipeline.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the lining pipe provided by the invention has the advantages that through reasonable interlayer design and raw material selection, the physical and chemical properties of the prepared lining pipe are obviously improved, the performance is stable, the interlayer transition connectivity is strong, the combination effect with the pipeline is good, the qualified rate of the repaired pipeline performance reaches 100%, the effective service life is prolonged by more than 2.6 times compared with that of the original pipeline, and the lining pipe is worthy of popularization and application.
The lining pipe adopts the composite fiber felt layer and the honeycomb type resin layer as the strengthening functional layers, has excellent mechanical properties, takes the honeycomb type resin layer as the conducting layer of internal pressure, has strong stress dispersion, high rebound plasticity and good energy dissipation and absorption effects, effectively lightens the impact on the outside fiber material, simultaneously has part of homologous materials with the bonding layer, has good combination effect and high infiltration combination degree except the infiltration combination of the surface layer and the filling connection among gaps in the hot melting combination process, and forms integral connection with the fiber material, and has good interlayer transition property. The composite fiber felt layer and the honeycomb type resin layer complement each other and complement each other in strength and toughness effect.
The composite fiber felt layer is reasonably woven and paved by using glass fibers and carbon fibers as raw materials, the compatibility effect between the two materials is good, the mutual influence between the materials is reduced, the multi-layer fiber materials are alternately arranged to be beneficial to stably keeping the mechanical property, the stress fracture risk of the single fiber material is reduced, and the interlayer buffering adaptability is realized.
The resin materials related by the invention have good compatibility, excellent associativity in the preparation process, and effective guarantee of stable adhesion among layers, the adhesive force grade is 1-2 grade, and most of the adhesive force can reach the 1 grade state. The fiber materials in the non-woven fabrics and the fiber felts play a good role in presenting and bridging in the whole liner tube, and are matched with the bonding sizing material with high compatibility, so that the forming process is smooth, and the internal structure of the structure is balanced. In addition, the bonding sizing material is added with the filler in an auxiliary manner, so that the bonding sizing material has good carrying performance and embedded volume besides the reinforcing effect of the bonding sizing material, is heated and compounded with the raw material containing the active group, further improves the combination effect among tissues, is beneficial to the adhesion connection and chemical bonding of the fiber material, and remarkably improves the comprehensive performance.
Drawings
FIG. 1 is a schematic view of the structure of a liner tube according to the present invention;
in the figure: 1 inner protective film layer, 2 inner non-woven fabric layer, 3 bonding layer, 4 composite fiber felt layer, 5 honeycomb type resin layer, 6 outer non-woven fabric layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
an inner lining pipe for stainless steel pipeline repair comprises an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb resin layer and an outer non-woven fabric layer which are sequentially arranged from inside to outside, wherein bonding layers are arranged among the layers for connection, wherein,
the sum of the thicknesses of the composite fiber felt layer and the honeycomb type resin layer is 40-60% of the thickness of the lining pipe, and the thickness ratio of the composite fiber felt layer to the honeycomb type resin layer is 1: 0.4-0.6; the composite fiber felt layer is made of glass fiber/carbon fiber composite materials, and the honeycomb resin layer is made of polyurethane modified epoxy acrylate;
the inner non-woven fabric layer adopts terylene/polypropylene filament geotextile with the weight of 600-; the terylene and the polypropylene fiber are mixed according to the proportion of 1:1, blending;
the outer non-woven fabric layer adopts polyester spun-bonded short-filament geotextile with the weight of 800 and 850 g;
the thickness of the single-layer bonding layer is 0.1-0.2mm, and the bonding layer is made of epoxy acrylate resin/ABS modified composite material;
an inner protective film layer (shown in figure) is also arranged in the inner non-woven fabric layer, the inner protective film layer adopts epoxy resin sealant, and the thickness of the inner protective film layer is 0.2-0.3 mm.
Example 2:
based on the liner structure of example 1, the raw material selection was prepared as follows:
① the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth, unidirectional carbon fiber/unidirectional glass fiber blended cloth (mass ratio of carbon fiber to glass fiber is 1:0.7), and the three types of cloth are connected by dipping glue and laminating;
specifically, the unidirectional carbon fiber cloth is provided with two layers which are respectively arranged on an upper outer side layer and a lower outer side layer, the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth are alternately arranged between the upper unidirectional carbon fiber cloth and the lower unidirectional carbon fiber cloth, the unidirectional carbon fiber/unidirectional glass fiber blended cloth is contacted with the unidirectional carbon fiber cloth, and the sum of the laying layers of the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth is 3 layers or 5 layers.
The unidirectional carbon fiber cloth, the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth are respectively represented by A, B, C, and the layering state between the layers of the composite fiber felt is ACBCA or ACBCBCA.
② the preparation method of the honeycomb type resin layer comprises mixing bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding filler, ultrasonic treating at 60 deg.C for 15min (25-28KHz), adding diluent, initiator, catalyst and promoter, heating at 70-90 deg.C for 1-3h, introducing into corresponding honeycomb type mold cavity in thermal gelation state, and curing to obtain the honeycomb type resin layer with porosity of 55-62%.
In the honeycomb type resin layer, a filler is nano-scale talcum powder, a diluent is an MMA and GMA composition in a mass ratio of 1:0.5, an initiator is dibenzoyl peroxide and benzoin methyl ether in a mass ratio of 1:0-1, a catalyst is tetramethylammonium chloride, and an accelerator is cobalt naphthenate; the honeycomb type resin layer comprises, by mass, 16-22% of bisphenol F epoxy acrylate prepolymer, 15-25% of polyurethane prepolymer, 2-7% of filler, 0.5-2% of initiator, 0.5-1% of catalyst, 0.5-2% of accelerator and the balance of diluent.
③ the preparation method of the bonding layer comprises mixing appropriate amount of epoxy acrylate resin and ABS resin, adding appropriate amount of filler, coupling agent, reactive diluent, initiator and accelerator, mixing, curing, crushing into granules with particle diameter of 0.5-3mm, and hot melting and spray coating.
The filling agent in the bonding layer is hollow glass microspheres, the coupling agent is KH-550, the active diluent is 1, 6-hexanediol diacrylate, the initiator is a dioctyl phthalate mixture containing 55 wt% of dibenzoyl peroxide, and the accelerator is cobalt naphthenate; the adhesive layer comprises, by mass, 20-27% of epoxy acrylate resin, 8-15% of ABS resin, 2.5-4% of filler, 2-5% of coupling agent, 0.5-2% of initiator, 0.5-2% of accelerator and the balance of diluent.
Example 3:
based on the lining tube structure of example 1, a stainless steel repair process is proposed, which is operated using the lining tube described above.
A stainless steel pipeline repairing process based on a flexible lining pipe comprises the following steps:
1) taking raw materials of an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb type resin layer, an outer non-woven fabric layer and a bonding layer, sequentially stacking the inner non-woven fabric layer, the composite fiber felt layer, the honeycomb type resin layer and the outer non-woven fabric layer, placing the bonding layer raw materials between the layers, and performing hot press molding to obtain a sheet;
2) coating a protective film layer on one surface of the sheet, drying, rolling the sheet into a tubular shape by sewing edges to obtain a lining tube blank tube, wherein the width of the sewing area of the lining tube blank tube is 10-20% of the inner diameter of the tube body (the sewing width of the following examples is 15%), and the protective film layer is positioned on the inner wall side of the tube body;
3) positioning and excavating a to-be-repaired stainless pipe, cutting and removing part of the original pipe, cleaning and performing surface treatment to ensure that the cut and the inner and outer walls of the pipe are smooth and free of impurities;
4) inserting the lining pipe blank pipe into the original pipeline, sealing two ends, expanding the pipe by using water pressure or air pressure, then sealing two ends of the lining pipe blank pipe and the original pipeline, vacuumizing the interlayer, injecting a bonding layer material of thermal gel into the interlayer, curing after the interlayer is filled, and then carrying out performance detection on the formed lining-containing pipeline.
Example 4:
based on the repair construction process of the embodiment 3, the selection and design of each parameter of the lining tube are further refined:
① the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth, unidirectional carbon fiber/unidirectional glass fiber blended cloth (mass ratio of carbon fiber to glass fiber is 1:0.7), the three types of cloth are connected by dipping glue and laminating, the laminating state between the composite fiber felt layers is ACBCA;
② the preparation method of the honeycomb type resin layer comprises the steps of taking a proper amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding a filler into the bisphenol F epoxy acrylate prepolymer and the polyurethane prepolymer under the condition of stirring, carrying out ultrasonic treatment for 15min (25.5KHz) at 60 ℃, then adding a diluent (MMA and GMA composition in a mass ratio of 1: 0.5), an initiator (dibenzoyl peroxide and benzoin methyl ether in a mass ratio of 1: 1), a catalyst (tetramethylammonium chloride) and an accelerator (cobalt naphthenate), heating and reacting for 2h at 90 ℃, introducing into a corresponding honeycomb type die cavity in a thermal gelation state, and carrying out curing molding, wherein the porosity of the molded honeycomb type resin layer is 58.4%.
The honeycomb type resin layer comprises, by mass, 20% of bisphenol F epoxy acrylate prepolymer, 20% of polyurethane prepolymer, 5% of filler, 1% of initiator, 0.5% of catalyst, 1.5% of accelerator and the balance of diluent.
③ the preparation method of the bonding layer comprises mixing appropriate amount of epoxy acrylate resin and ABS resin, adding appropriate amount of filler (hollow glass microsphere), coupling agent (KH-550), active diluent (1, 6-hexanediol diacrylate), initiator (dioctyl phthalate mixture containing 55 wt% dibenzoyl peroxide), and promoter (cobalt naphthenate), mixing, curing, crushing into granules with particle diameter of 0.5-3mm, and hot melting and spray coating.
The adhesive layer comprises, by mass, 25% of epoxy acrylate resin, 10% of ABS resin, 3% of a filler, 4% of a coupling agent, 1% of an initiator, 2% of an accelerator and the balance of a diluent.
The lining pipe prepared by the embodiment has excellent tensile strength, bending strength and impact strength which are respectively 1.33 times, 2.14 times and 1.22 times of those of stainless steel linings with the same specification, the elongation is improved by more than 5 times, meanwhile, the specific gravity of the same specification is reduced by more than 50%, and the lining pipe is light and high in strength; in addition, the paint has excellent tolerance to water, acid (10% H2SO4), alkali (20% NaOH) and crude oil, and the physicochemical properties of the lining pipe are basically kept unchanged after the lining pipe is filled with the liquid for 1500 hours. Compared with the plastic lining pipe with the same specification, the tensile strength, the bending strength and the impact strength are all improved by more than 7 times.
Example 5:
based on the repair construction process of the embodiment 3, the selection and design of each parameter of the lining tube are further refined:
① the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth, unidirectional carbon fiber/unidirectional glass fiber blended cloth (mass ratio of carbon fiber to glass fiber is 1:0.7), the three types of cloth are connected by dipping glue and laminating, the laminating state between the composite fiber felt layers is ACBCA;
② the preparation method of the honeycomb type resin layer comprises the steps of taking a proper amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding a filler into the bisphenol F epoxy acrylate prepolymer and the polyurethane prepolymer under the condition of stirring, carrying out ultrasonic treatment for 15min (27KHz) at 60 ℃, then adding a diluent (MMA and GMA composition in a mass ratio of 1: 0.5), an initiator (dibenzoyl peroxide and benzoin methyl ether in a mass ratio of 1: 1), a catalyst (tetramethylammonium chloride) and an accelerator (cobalt naphthenate), heating and reacting for 2h at 90 ℃, introducing into a corresponding honeycomb type die cavity in a thermal gelation state, and carrying out curing molding, wherein the porosity of the molded honeycomb type resin layer is 59.2%.
The honeycomb type resin layer comprises 18% of bisphenol F epoxy acrylate prepolymer, 25% of polyurethane prepolymer, 3% of filler, 0.5% of initiator, 0.4% of catalyst, 2% of accelerator and the balance of diluent by mass.
③ the preparation method of the bonding layer comprises mixing appropriate amount of epoxy acrylate resin and ABS resin, adding appropriate amount of filler (hollow glass microsphere), coupling agent (KH-550), active diluent (1, 6-hexanediol diacrylate), initiator (dioctyl phthalate mixture containing 55 wt% dibenzoyl peroxide), and promoter (cobalt naphthenate), mixing, curing, crushing into granules with particle diameter of 0.5-3mm, and hot melting and spray coating.
The adhesive layer comprises, by mass, 27% of epoxy acrylate resin, 13% of ABS resin, 4% of filler, 4% of coupling agent, 2% of initiator, 2% of accelerator and the balance of diluent.
The lining pipe prepared by the embodiment has excellent tensile strength, bending strength and impact strength which are respectively 1.26 times, 2.42 times and 1.28 times of those of stainless steel linings with the same specification, the elongation is improved by more than 5 times, meanwhile, the specific gravity of the same specification is reduced by more than 50%, and the lining pipe is light and high in strength; in addition, the paint has excellent tolerance to water, acid (10% H2SO4), alkali (20% NaOH) and crude oil, and the physicochemical properties of the lining pipe are basically kept unchanged after the lining pipe is filled with the liquid for 1500 hours. Compared with the plastic lining pipe with the same specification, the tensile strength, the bending strength and the impact strength are all improved by more than 7 times.
Example 6:
based on the repair construction process of the embodiment 3, the selection and design of each parameter of the lining tube are further refined:
① the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth, unidirectional carbon fiber/unidirectional glass fiber blended cloth (mass ratio of carbon fiber to glass fiber is 1:0.7), the three types of cloth are connected by dipping glue and laminating;
② the preparation method of the honeycomb type resin layer comprises the steps of taking a proper amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding a filler into the bisphenol F epoxy acrylate prepolymer and the polyurethane prepolymer under the condition of stirring, carrying out ultrasonic treatment for 15min (27KHz) at 60 ℃, then adding a diluent (MMA and GMA composition in a mass ratio of 1: 0.5), an initiator (dibenzoyl peroxide and benzoin methyl ether in a mass ratio of 1: 1), a catalyst (tetramethylammonium chloride) and an accelerator (cobalt naphthenate), heating to react for 2.5h at 90 ℃, introducing into a corresponding honeycomb type die cavity in a thermal gelation state, and carrying out curing molding, wherein the porosity of the molded honeycomb type resin layer is 60.3%.
The mass percentage of each raw material in the honeycomb type resin layer is 20% of bisphenol F epoxy acrylate prepolymer, 25% of polyurethane prepolymer, 7% of filling agent, 1.5% of initiator, 1% of catalyst, 2% of accelerant and the balance of diluent.
③ the preparation method of the bonding layer comprises mixing appropriate amount of epoxy acrylate resin and ABS resin, adding appropriate amount of filler (hollow glass microsphere), coupling agent (KH-550), active diluent (1, 6-hexanediol diacrylate), initiator (dioctyl phthalate mixture containing 55 wt% dibenzoyl peroxide), and promoter (cobalt naphthenate), mixing, curing, crushing into granules with particle diameter of 0.5-3mm, and hot melting and spray coating.
The adhesive layer comprises, by mass, 20% of epoxy acrylate resin, 8% of ABS resin, 3% of filler, 3% of coupling agent, 1.5% of initiator, 1.5% of accelerator and the balance of diluent.
The lining pipe prepared by the embodiment has excellent tensile strength, bending strength and impact strength which are respectively 1.55 times, 2.68 times and 1.36 times of those of stainless steel linings with the same specification, the elongation is improved by more than 5 times, meanwhile, the specific gravity of the same specification is reduced by more than 50%, and the lining pipe is light and high in strength; in addition, the paint has excellent tolerance to water, acid (10% H2SO4), alkali (20% NaOH) and crude oil, and the physicochemical properties of the lining pipe are basically kept unchanged after the lining pipe is filled with the liquid for 1200 hours. Compared with the plastic lining pipe with the same specification, the tensile strength, the bending strength and the impact strength are all improved by at least 10 times.
Example 7:
based on the repair construction process of the embodiment 3, the selection and design of each parameter of the lining tube are further refined:
① the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth, unidirectional carbon fiber/unidirectional glass fiber blended cloth (mass ratio of carbon fiber to glass fiber is 1:0.7), the three types of cloth are connected by dipping glue and laminating;
② the preparation method of the honeycomb type resin layer comprises taking appropriate amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding filler under stirring, performing ultrasonic treatment at 60 deg.C for 15min (25.5KHz), adding diluent (MMA, GMA composition with mass ratio of 1: 0.5), initiator (dibenzoyl peroxide), catalyst (tetramethylammonium chloride) and accelerator (cobalt naphthenate), heating at 90 deg.C for 2h, introducing into corresponding honeycomb type mold cavity in thermal gel state, and curing to form the honeycomb type resin layer with porosity of 60.3%.
The honeycomb type resin layer comprises, by mass, 21% of bisphenol F epoxy acrylate prepolymer, 20% of polyurethane prepolymer, 4% of filler, 1% of initiator, 0.5% of catalyst, 1% of accelerator and the balance of diluent.
③ the preparation method of the bonding layer comprises mixing appropriate amount of epoxy acrylate resin and ABS resin, adding appropriate amount of filler (hollow glass microsphere), coupling agent (KH-550), active diluent (1, 6-hexanediol diacrylate), initiator (dioctyl phthalate mixture containing 55 wt% dibenzoyl peroxide), and promoter (cobalt naphthenate), mixing, curing, crushing into granules with particle diameter of 0.5-3mm, and hot melting and spray coating.
The adhesive layer comprises, by mass, 25% of epoxy acrylate resin, 10% of ABS resin, 3% of filler, 3% of coupling agent, 1% of initiator, 2% of accelerator and the balance of diluent.
The lining pipe prepared by the embodiment has excellent tensile strength, bending strength and impact strength which are respectively 1.71 times, 2.66 times and 1.29 times of those of stainless steel linings with the same specification, the elongation is improved by more than 5 times, meanwhile, the specific gravity of the same specification is reduced by more than 50%, and the lining pipe is light and high in strength; in addition, the paint has excellent tolerance to water, acid (10% H2SO4), alkali (20% NaOH) and crude oil, and the physicochemical properties of the lining pipe are basically kept unchanged after the lining pipe is filled with the liquid for 1200 hours. Compared with the plastic lining pipe with the same specification, the tensile strength, the bending strength and the impact strength are all improved by at least 10 times.
Control group 1:
with reference to example 4, the structure of the lining pipe is adjusted to an inner protective film layer, an inner non-woven fabric layer, a composite fiber felt layer and an outer non-woven fabric layer (without a honeycomb resin layer), and the lining pipe is connected by bonding layer materials, so that compared with the lining pipe product in example 4, the performance of the lining pipe is reduced by 46% in tensile strength, 57% in bending strength and 44% in impact strength.
Control group 2:
with reference to example 4, the structure of the lining pipe is adjusted to an inner protective film layer, an inner non-woven fabric layer, a honeycomb resin layer, an outer non-woven fabric layer (without a composite fiber felt layer), and the lining pipe is also connected by a bonding layer material, so that compared with the lining pipe product in example 4, the performance of the lining pipe is reduced by 263% in tensile strength, 168% in bending strength and 203% in impact strength.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a bushing pipe for stainless steel pipeline is restoreed which characterized in that: the lining pipe comprises an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb type resin layer and an outer non-woven fabric layer which are sequentially arranged from inside to outside, bonding layers are arranged among the layers to be connected, wherein,
the sum of the thicknesses of the composite fiber felt layer and the honeycomb type resin layer is 40-60% of the thickness of the lining pipe, and the thickness ratio of the composite fiber felt layer to the honeycomb type resin layer is 1: 0.4-0.6;
the inner non-woven fabric layer adopts terylene/polypropylene filament geotextile with the weight of 600-;
the outer non-woven fabric layer adopts polyester spun-bonded short-filament geotextile with the weight of 800 and 850 g;
the thickness of the single-layer bonding layer is 0.1-0.2 mm.
2. The lined pipe for stainless steel pipeline rehabilitation as claimed in claim 1, wherein: an inner protective film layer is further arranged in the inner non-woven fabric layer and adopts epoxy resin sealant, and the thickness of the inner protective film layer is 0.2-0.3 mm.
3. The liner tube for stainless steel pipeline rehabilitation as claimed in claim 2, wherein: the composite fiber felt layer is made of glass fiber/carbon fiber composite material; the honeycomb type resin layer is made of polyurethane modified epoxy acrylate, and the bonding layer is made of epoxy acrylate resin/ABS modified composite material.
4. The liner tube for stainless steel pipeline rehabilitation as claimed in claim 3, wherein: the composite fiber felt layer comprises unidirectional carbon fiber cloth, unidirectional glass fiber cloth and unidirectional carbon fiber/unidirectional glass fiber blended cloth, and the three types of cloth are connected in a stacking mode through dipping glue layers; specifically, the unidirectional carbon fiber cloth is provided with two layers which are respectively arranged on an upper outer side layer and a lower outer side layer, the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth are alternately arranged between the upper unidirectional carbon fiber cloth and the lower unidirectional carbon fiber cloth, the unidirectional carbon fiber/unidirectional glass fiber blended cloth is contacted with the unidirectional carbon fiber cloth, and the sum of the laying layers of the unidirectional glass fiber cloth and the unidirectional carbon fiber/unidirectional glass fiber blended cloth is 3 layers or 5 layers.
5. The liner tube for stainless steel pipeline rehabilitation as claimed in claim 3, wherein: the preparation method of the honeycomb type resin layer comprises the steps of taking a proper amount of bisphenol F epoxy acrylate prepolymer and polyurethane prepolymer, adding a filler into the bisphenol F epoxy acrylate prepolymer and the polyurethane prepolymer under the stirring condition, carrying out ultrasonic treatment for 15min at the temperature of 60 ℃, then adding a diluent, an initiator, a catalyst and an accelerator into the mixture, carrying out heating reaction for 1-3h at the temperature of 70-90 ℃, introducing the mixture into a corresponding honeycomb type die cavity in a thermal gelation state, and carrying out curing molding, wherein the porosity of the molded honeycomb type resin layer is 55-62%.
6. The lined pipe for stainless steel pipeline rehabilitation as claimed in claim 5, wherein: the filler is nano-scale talcum powder, the diluent is an MMA and GMA composition with the mass ratio of 1:0.5, the initiator is dibenzoyl peroxide and benzoin methyl ether with the mass ratio of 1:0-1, the catalyst is tetramethylammonium chloride, and the accelerator is cobalt naphthenate.
7. The liner tube for stainless steel pipeline rehabilitation as claimed in claim 3, wherein: the preparation method of the adhesive layer comprises the steps of taking a proper amount of epoxy acrylate resin and ABS resin, adding a proper amount of filler, coupling agent, reactive diluent, initiator and accelerator, uniformly mixing, curing, and crushing into particles with the particle size of 0.5-3 mm.
8. The lined pipe for stainless steel pipeline rehabilitation as claimed in claim 7, wherein: the filler is hollow glass microspheres, the coupling agent is KH-550, the active diluent is 1, 6-hexanediol diacrylate, the initiator is a dioctyl phthalate mixture containing 55 wt% of dibenzoyl peroxide, and the accelerator is cobalt naphthenate.
9. A stainless steel pipeline repairing process based on a flexible lining pipe is characterized in that: the flexible lining pipe adopts the lining pipe for stainless steel pipeline repair of any one of claims 3-8.
10. The stainless steel pipeline repairing process according to claim 9, wherein the repairing process comprises the following steps:
1) taking raw materials of an inner non-woven fabric layer, a composite fiber felt layer, a honeycomb type resin layer, an outer non-woven fabric layer and a bonding layer, sequentially stacking the inner non-woven fabric layer, the composite fiber felt layer, the honeycomb type resin layer and the outer non-woven fabric layer, placing the bonding layer raw materials between the layers, and performing hot press molding to obtain a sheet;
2) coating a protective film layer on one surface of the sheet, drying, rolling the sheet into a tubular shape by sewing edges to obtain a lining tube blank tube, wherein the width of the sewing area of the lining tube blank tube is 10-20% of the inner diameter of the tube body, and the protective film layer is positioned on the inner wall side of the tube body;
3) positioning and excavating a to-be-repaired stainless pipe, cutting and removing part of the original pipe, cleaning and performing surface treatment to ensure that the cut and the inner and outer walls of the pipe are smooth and free of impurities;
4) inserting the lining pipe blank pipe into the original pipeline, sealing two ends, expanding the pipe by using water pressure or air pressure, then sealing two ends of the lining pipe blank pipe and the original pipeline, vacuumizing the interlayer, injecting a bonding layer material of thermal gel into the interlayer, curing after the interlayer is filled, and then carrying out performance detection on the formed lining-containing pipeline.
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| CN201911318980.9A CN111022820A (en) | 2019-12-19 | 2019-12-19 | Lining pipe for stainless steel pipeline repair and repair process |
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Application publication date: 20200417 |