CN115560141A - Inner pipe for flexible composite pipe, preparation method and flexible composite pipe - Google Patents

Inner pipe for flexible composite pipe, preparation method and flexible composite pipe Download PDF

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Publication number
CN115560141A
CN115560141A CN202210906198.4A CN202210906198A CN115560141A CN 115560141 A CN115560141 A CN 115560141A CN 202210906198 A CN202210906198 A CN 202210906198A CN 115560141 A CN115560141 A CN 115560141A
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CN
China
Prior art keywords
layer
pipe
flexible composite
pipeline
middle layer
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Pending
Application number
CN202210906198.4A
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Chinese (zh)
Inventor
夏平原
陈江华
赵绍东
朱原原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Zhengdao Combustible Ice Pipeline Co ltd
Original Assignee
Jiangsu Zhengdao Combustible Ice Pipeline Co ltd
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Priority to CN202210906198.4A priority Critical patent/CN115560141A/en
Publication of CN115560141A publication Critical patent/CN115560141A/en
Pending legal-status Critical Current

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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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/06—Hoses, i.e. flexible pipes made of rubber or flexible plastics with homogeneous wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/085—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more braided layers
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L2011/047—Hoses, i.e. flexible pipes made of rubber or flexible plastics with a diffusion barrier layer

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses an inner pipe which is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside; the middle layer comprises a plurality of holes for the penetration of the inner layer and the outer layer or meshes of a crossed mesh structure at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed mesh structure to form a riveted structure. The inner pipe for the flexible composite pipe can meet the requirement of the flexibility of the pipeline and enable the pipeline to have the coilable characteristic under the condition of ensuring temperature resistance and corrosion resistance. Considering three-layer composite structure's bonding problem, through being porous structure with the intermediate level design, the ectonexine couples together through the hole position, forms a rivet structure, can enough avoid different materials to produce obvious layering like this, can also make inlayer and skin and intermediate level better combination be in the same place, improves the bonding strength of inlayer and skin and intermediate level for the pipeline bears deformability and improves, and the butt joint is firm, improves the life of pipeline.

Description

Inner pipe for flexible composite pipe, preparation method and flexible composite pipe
Technical Field
The invention relates to the technical field of high-pressure high-temperature petroleum and natural gas conveying, in particular to an inner pipe for a flexible composite pipe, a preparation method and the flexible composite pipe.
Background
The flexible composite pipe is also called flexible pipe, composite pipe, flexible pipe, RTP, flexible pipe and the like, and at present, the pipeline is widely applied to the fields of oil and gas exploitation and oil and gas transmission on ocean land and is one of the most economic and reliable pipeline products. Generally, a traditional flexible composite pipe adopts a composite structure, and is composed of a reinforced material and an extruded material, and the main structure of the flexible composite pipe is a structure with more than three functional layers, wherein an inner pipe layer is mainly used for manufacturing a medium conveying layer (commonly called as an inner pipe layer) of the flexible composite pipe, the middle functional layer provides mechanical strength, and an outer protective layer provides a protective function of isolating the environment.
However, as oil and gas production is gradually deepened, heavy oil, high hydrogen sulfide and high corrosion oil and gas fields are gradually produced, the bottleneck of extrusion materials is gradually highlighted, firstly, the extrusion materials are generally polymer materials, and generally, the American Petroleum institute recommends common materials as follows: high density polyethylene, nylon, polyvinylidene fluoride, etc. to accommodate applications at different temperatures and different corrosion conditions, typically the cost of the polymeric material increases with increasing use temperature. And the flexible composite pipe has the advantages that the flexibility is flexible and can be coiled, and the plastic polymer can lose the flexibility characteristic along with the improvement of the temperature resistance, so that a single pipeline product with the transportation length of more than 100 meters can not be manufactured.
Disclosure of Invention
It is an object of the present invention to provide an inner tube for a flexible composite pipe, a method of manufacturing and a flexible composite pipe solving one or more of the above mentioned prior art problems.
In a first aspect, the invention provides an inner tube for a flexible composite tube, which is provided with an inner layer, an intermediate layer and an outer layer from inside to outside in sequence;
the middle layer comprises a plurality of holes or meshes of a crossed net structure, which are used for the penetration of the inner layer and the outer layer, at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed net structure to form a riveting structure.
Wherein: the inner pipe for the flexible composite pipe is bendable with a bending radius of 0.5-3m.
In certain embodiments, the material of the inner and outer tubes is generally the same material. Typically a media-contacting material.
In certain embodiments, the inner layer is made of a resin with temperature resistance, permeation resistance and corrosion resistance, and the outer layer is made of a resin with temperature resistance, permeation resistance and corrosion resistance.
In some embodiments, the material of the inner layer is selected from one or more of polyethylene, polypropylene, polyvinylidene fluoride, polydodecalactam and polyphenylene sulfide, and the material of the outer layer is selected from one or more of polyethylene, polypropylene, polyvinylidene fluoride, polydodecalactam and polyphenylene sulfide.
In certain embodiments, the intermediate layer is a scaffold layer having a porous structure or a cross-network structure.
In certain embodiments, the material of the intermediate layer is selected from a high modulus material or a low modulus material; the high modulus material is selected from engineering plastics; the low modulus material is selected from rubber or thermoplastic elastomer, the rubber is selected from ethylene propylene diene monomer, and the thermoplastic elastomer is selected from crosslinked polyethylene.
Wherein: the intermediate layer is of a material different from the inner and outer layers and generally functions to provide skeletal support or flexible deformation.
The inner layer and the outer layer have higher modulus, so that the modulus of the inner layer and the outer layer is far higher than that of the middle layer, the relative thickness of the inner layer and the outer layer is generally designed to be lower than that of the middle layer in the preparation process, and the whole pipeline can be bent and curled freely.
In a second aspect, the present invention provides a method for preparing an inner tube for a flexible composite pipe, comprising the steps of:
s1, preparing an intermediate layer with meshes with holes or a crossed net structure;
and S2, connecting the inner layer, the outer layer and the middle layer through holes or meshes of a crossed net structure to form a riveting structure, so that the inner layer and the outer layer are respectively coated on the inner side wall and the outer side wall of the middle layer to form a complete tubular structure.
In certain embodiments, the inner and outer layer materials in step S2 are generally prepared by means of osmotic extrusion or in-mold molding.
In certain embodiments, the inner layer has a thickness of 0.5 to 10mm.
In certain embodiments, the outer layer has a thickness of 0.5 to 10mm.
In certain embodiments, step S1 comprises the steps of:
firstly, extruding the middle layer by using a No. 1 extruder, and then rolling and punching by using a roller press to form the middle layer with a porous structure; or
The intermediate layer was extruded using a No. 1 extruder, through a die design into an intermediate layer with cross-meshed structure cells.
In certain embodiments, step S1 comprises the steps of:
extruding rubber into a pipeline with the inner diameter of 50-55mm and the outer diameter of 55-60mm by a special rubber machine, and vulcanizing by a continuous microwave and hot air vulcanization production line, wherein the production advancing speed is 1-5m/min, the vulcanization production line is 50-65m, and the vulcanization time is 20-35min; after vulcanization, carrying out hole rolling through multi-roller hole rolling equipment, wherein the diameter of each hole is 2mm, the number of the holes is 220-250/10 cm, and winding after hole rolling is finished to obtain the intermediate layer; or
Extruding the thermoplastic elastomer or the high-melting-point plastic into a pipeline with an inner diameter of 130-140mm, an outer diameter of 145-155mm and a cross-mesh structure with a pipeline surface porosity of 40% by a No. 1 extruder, soaking the pipeline in hot water to crosslink the pipeline, and winding after crosslinking to obtain the intermediate layer.
In some embodiments, the inner layer has holes with a diameter of 0.1-50mm and a pitch of 0.1-50mm, and the inner layer has different design principles according to different pipe diameters, and belongs to the protection scope.
In certain embodiments, step S2 comprises the steps of:
and drawing the middle layer into a No. 2 extruder through a tractor, extruding the temperature-resistant, anti-seepage and corrosion-resistant resin through a die by a right-angle head die, and infiltrating the resin into the middle layer from the outside of the middle layer under the extrusion pressure of the die to form an inner layer and an outer layer of a riveting structure in the middle layer.
In a third aspect, the present invention provides a flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of steel bands or aramid fibers,
winding the steel belt or aramid fiber on the outer side wall of the inner pipe to form the reinforcing layer; or
Wrapping the aramid fiber on the outer side wall of the inner pipe to form the reinforcing layer;
the protective layer wraps the reinforcing layer and is made of polyethylene. The protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner pipe is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside;
the middle layer comprises a plurality of holes or meshes of a crossed net structure, which are used for the penetration of the inner layer and the outer layer, at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed net structure to form a riveting structure.
The preparation method of the inner tube comprises the following steps:
s1, preparing an intermediate layer with meshes with holes or a crossed net structure;
and S2, connecting the inner layer, the outer layer and the middle layer through holes or meshes of a crossed reticular structure to form a riveted structure, so that the inner layer and the outer layer are respectively coated on the inner side wall and the outer side wall of the middle layer to form a complete tubular structure.
Has the beneficial effects that: the inner pipe for the flexible composite pipe can meet the requirement of pipeline flexibility under the condition of ensuring temperature resistance and corrosion resistance, so that the inner pipe has the characteristic of coiling. Considering three-layer composite structure's bonding problem, through being porous structure with the intermediate level design, the ectonexine couples together through the hole position, forms a rivet structure, can enough avoid different materials to produce obvious layering like this, can also make inlayer and skin and intermediate level better combination be in the same place, improves the bonding strength of inlayer and skin and intermediate level for the pipeline bears deformability and improves, and the butt joint is firm, improves the life of pipeline. The inner pipe is simple in structure and easy to operate, meets the requirements of high temperature resistance, corrosion resistance, improvement of flexibility and coilability of the pipeline, and reduces cost. And the flexible composite pipe prepared from the inner pipe does not lose flexibility along with the improvement of temperature resistance, so that the coilable property of the flexible composite pipe is improved.
Drawings
FIG. 1 is a schematic structural view of an intermediate layer of example 1;
FIG. 2 is a schematic structural view of the inner tube of example 1;
FIG. 3 is a schematic structural view of a composite flexible pipe of example 1;
fig. 4 is a schematic view of the structure of the intermediate layer of example 2.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the examples and the accompanying drawings. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, is a flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of a steel belt, the steel belt is wound on the outer side wall of the inner pipe to form the reinforcing layer, and the winding angle of the steel belt forms an included angle of 50-60 degrees with the axial direction of the pipeline;
the protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner diameter of the pipeline of the flexible composite pipe is 50mm, the total wall thickness of the inner pipe is 5mm, the integral temperature resistance of the pipeline meets 110 ℃, the bending radius of the pipeline is 1.5m, and the coiling diameter is 3m.
As shown in fig. 2, is an inner tube, which is provided with an inner layer, an intermediate layer and an outer layer from inside to outside in sequence;
as shown in fig. 3, is an intermediate layer comprising a plurality of holes or meshes of a cross-mesh structure for infiltration of the inner and outer layers at least in the area covered by the inner and outer layers, so that the inner and outer layers and the intermediate layer are connected by the holes or meshes of the cross-mesh structure to form a riveted structure.
The preparation method of the inner tube comprises the following steps:
a. the inner pipe layer is divided into three layers A, B and C, wherein the layer C of the layer A is polyphenylene sulfide (PPS), the layer B is Ethylene Propylene Diene Monomer (EPDM), the layer A is 1mm, the layer C is 0.5mm, and the layer B is 3.5mm;
b. extruding ethylene propylene diene monomer rubber into a pipeline with the inner diameter of 52mm and the outer diameter of 59mm by a special rubber extruder, vulcanizing by a continuous microwave and hot air vulcanization production line, wherein the production advancing speed is 2m/min, the vulcanization production line is 60m, the vulcanization time is about 30min, carrying out hole rolling by multi-roller hole rolling equipment after vulcanization, gradually increasing the diameter of a three-roller pin hole by a hole rolling machine, finally, the diameter of the final pin hole is 2mm, the number of the pin holes is 220-250/10 cm, and winding after hole rolling is finished;
c. drawing the wound semi-finished structure layer B into an extruder No. 2 through a tractor, extruding the modified polyphenylene sulfide through a die through a right-angle head die, and infiltrating the modified polyphenylene sulfide into the structure layer from the outer layer of the structure layer B under the extrusion pressure of the die to form a structure layer A and a structure layer C which are connected in a riveting manner at the position of the structure layer B;
d. the elongation at break of the modified polyphenylene sulfide is more than 50 percent, the elastic modulus is about 1200-1500MPa, the elongation at break of the ethylene propylene diene monomer after vulcanization is more than 300 percent, and the elastic modulus is about 10MPa;
e. the structural layer A + B + C can be bent to the radius of 1.2m through testing, the requirement of coiling the pipe to the diameter of 3m is met, and the subsequent procedure is carried out to produce the composite pipe.
The maximum use temperature of the polyphenylene sulfide can reach more than 200 ℃, and the long-term use temperature of the ethylene propylene diene monomer can reach 120 ℃. By adopting the process, the integral temperature resistance is not obviously reduced, and meanwhile, the structural layer ethylene propylene diene monomer rubber can be freely bent due to lower elastic modulus.
Example 2
A flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of aramid fibers, and the outer side wall of the inner pipe is wrapped with the aramid fibers to form the reinforcing layer;
the protective layer wraps the reinforcing layer, and the protective layer is made of polyethylene. The protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner diameter of the flexible composite pipe is 133mm, the total wall thickness of the inner pipe is 9.5mm, the integral temperature resistance of the pipeline meets 90 ℃, the aromatic hydrocarbon-containing oil transportation condition is used, the bending radius of the pipeline is 1.8m, and the coil diameter is 3.6m.
The inner pipe is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside;
as shown in fig. 4, is a middle layer comprising a plurality of holes or meshes of a cross-mesh structure for the penetration of the inner and outer layers at least in the area covered by the inner and outer layers, so that the inner and outer layers and the middle layer are connected by the holes or meshes of the cross-mesh structure to form a riveted structure.
The preparation method of the inner tube comprises the following steps:
a. the inner pipe layer is divided into three layers A, B and C, wherein the layer C of the layer A is polyvinylidene fluoride (PVDF), the layer B is crosslinked polyethylene (PE-X), the thickness of the layer A is 2.5mm, the thickness of the layer C is 1mm, and the thickness of the layer B is 6mm;
b. extruding a PE-X material by a plastic extruder, forming a tubular porous structure layer B by using the die in the embodiment 1, extruding and producing a mesh structure with the inner diameter of 138mm, the outer diameter of 150mm, the surface porosity of a pipeline of 40% and the balance of PE-X material, soaking the structure layer B in hot water to crosslink the structure layer B, and winding after crosslinking;
c. continuously drawing the semi-finished product in the step B to an extruder No. 2, extruding the PVDF through the extruder through a right-angle head die, and infiltrating the PVDF through a structural layer B under the extrusion pressure of the die to form a structural layer A and a structural layer C which are riveted with each other;
d. the elasticity modulus and the elongation at break of the crosslinked polyethylene are equivalent to those of the polyvinylidene fluoride, the crosslinked polyethylene can meet the requirement of bending radius, and the use of the polyvinylidene fluoride which is a high-cost material is greatly reduced
e. The test shows that the structure layer A + B + C can be bent to the radius of 1.8m, the requirement of coiling the pipe to the diameter of 3.6m is met, and the subsequent process is carried out to produce the composite pipe.
By adopting the working procedures, the integral temperature resistance is not obviously reduced, and meanwhile, the cross-linked polyethylene of the structural layer has lower elastic modulus and can be freely bent.
Example 3
A flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of a steel strip, the steel strip is wound on the outer side wall of the inner pipe to form the reinforcing layer, and the winding angle of the steel strip forms an included angle of 50-60 degrees with the axial direction of the pipeline;
the protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner diameter of the pipeline of the flexible composite pipe is 50mm, the total wall thickness of the inner pipe is 5mm, the integral temperature resistance of the pipeline meets 110 ℃, the bending radius of the pipeline is 1.5m, and the coiling diameter is 3m.
The inner pipe is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside;
the middle layer comprises a plurality of holes for the penetration of the inner layer and the outer layer or meshes of a crossed mesh structure at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed mesh structure to form a riveted structure.
The preparation method of the inner tube comprises the following steps:
a. the inner pipe layer is divided into three layers A, B and C, wherein the layer C of the layer A is polyphenylene sulfide (PPS), the layer B is Ethylene Propylene Diene Monomer (EPDM), the thickness of the layer A is 1mm, the thickness of the layer C is 0.5mm, and the thickness of the layer B is 3.5mm;
b. extruding ethylene propylene diene monomer rubber into a pipeline with an inner diameter of 53mm and an outer diameter of 60mm through a special rubber extruder, vulcanizing through a continuous microwave and hot air vulcanization production line, wherein the production advancing speed is 5m/min, the vulcanization production line is 65m, the vulcanization time is about 35min, carrying out hole rolling through multi-roller hole rolling equipment after vulcanization, gradually increasing the diameters of three roller pin holes through a hole rolling machine, finally, the diameter of each pin hole is 2mm, the number of the pin holes is 230/10 cm, and winding after hole rolling is finished;
c. drawing the wound semi-finished structure layer B into an extruder No. 2 through a tractor, extruding the modified polyphenylene sulfide through a die through a right-angle head die, and infiltrating the modified polyphenylene sulfide into the structure layer from the outer layer of the structure layer B under the extrusion pressure of the die to form a structure layer A and a structure layer C which are connected in a riveting manner at the position of the structure layer B;
d. the elongation at break of the modified polyphenylene sulfide is more than 50 percent, the elastic modulus is about 1200-1500MPa, the elongation at break of the ethylene propylene diene monomer after vulcanization is more than 300 percent, and the elastic modulus is about 10MPa;
e. the structural layer A + B + C can be bent to the radius of 1.2m through testing, the requirement of coiling the pipe to the diameter of 3m is met, and the subsequent procedure is carried out to produce the composite pipe.
The maximum use temperature of the polyphenylene sulfide can reach more than 200 ℃, and the long-term use temperature of the ethylene propylene diene monomer can reach 120 ℃. By adopting the process, the integral temperature resistance is not obviously reduced, and meanwhile, the structural layer ethylene propylene diene monomer rubber can be freely bent due to low elastic modulus.
Example 4
A flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of aramid fibers, and the outer side wall of the inner pipe is coated with the aramid fibers to form the reinforcing layer;
the protective layer wraps the reinforcing layer, and the protective layer is made of polyethylene. The protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner diameter of the flexible composite pipe is 133mm, the total wall thickness of the inner pipe is 9.5mm, the integral temperature resistance of the pipeline meets 90 ℃, the aromatic hydrocarbon-containing oil transportation condition is used, the bending radius of the pipeline is 1.8m, and the coil diameter is 3.6m.
The inner pipe is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside;
the middle layer comprises a plurality of holes for the penetration of the inner layer and the outer layer or meshes of a crossed mesh structure at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed mesh structure to form a riveted structure.
The preparation method of the inner tube comprises the following steps:
a. the inner pipe layer is divided into three layers A, B and C, wherein the layer C of the layer A is polyvinylidene fluoride (PVDF), the layer B is a thermoplastic elastomer, the thickness of the layer A is 2.5mm, the thickness of the layer C is 1mm, and the thickness of the layer B is 6mm;
b. extruding a thermoplastic elastomer through a plastic extruder, forming a tubular porous structure layer B by using the die in the embodiment 1, and extruding to produce a reticular structure with the inner diameter of 138mm, the outer diameter of 150mm, the surface porosity of the pipeline of 40 percent and the interlaced thermoplastic elastomer in the rest, wherein the structure layer B is crosslinked by soaking in hot water, and winding after crosslinking is completed;
c. continuously drawing the semi-finished product in the step B to an extruder No. 2, extruding the PVDF through the extruder through a right-angle head die, and infiltrating the PVDF through a structural layer B under the extrusion pressure of the die to form a structural layer A and a structural layer C which are riveted with each other;
d. the thermoplastic elastomer has good elastic modulus and elongation at break performance, can meet the requirement of bending radius, and greatly reduces the use of polyvinylidene fluoride which is a high-cost material
e. The structural layer A + B + C can be bent to the radius of 1.8m through testing, the requirement of coiling the pipe to the diameter of 3.6m is met, and the subsequent procedure is carried out to produce the composite pipe.
By adopting the working procedures, the integral temperature resistance is not obviously reduced, and meanwhile, the structural layer thermoplastic elastomer can be freely bent due to lower elastic modulus.
Comparative example 1
A flexible composite pipe comprising:
an inner tube;
the reinforcing layer is made of a steel strip, the steel strip is wound on the outer side wall of the inner pipe to form the reinforcing layer, and the winding angle of the steel strip forms an included angle of 50-60 degrees with the axial direction of the pipeline;
the protective layer wraps the reinforcing layer and is made of polyethylene.
Wherein: the inner diameter of the pipeline of the flexible composite pipe is 50mm, the total wall thickness of the inner pipe is 5mm, the integral temperature resistance of the pipeline meets 90 ℃, the bending radius of the pipeline is 0.8m, and the coiling diameter is 3m.
Wherein: the inner tube has only one layer, and the material of the inner tube is polyphenylene sulfide (PPS).
In summary, the following steps: the inner pipe for the flexible composite pipe can meet the requirement of the flexibility of the pipeline and enable the pipeline to have the coilable characteristic under the condition of ensuring temperature resistance and corrosion resistance. Considering three-layer composite structure's bonding problem, through being porous structure with the intermediate level design, the ectonexine couples together through the hole position, forms a rivet structure, can enough avoid different materials to produce obvious layering like this, can also make inlayer and skin and intermediate level better combination be in the same place, improves the bonding strength of inlayer and skin and intermediate level for the pipeline bears deformability and improves, and the butt joint is firm, improves the life of pipeline. The inner pipe is simple in structure and easy to operate, meets the requirements of high temperature resistance, corrosion resistance, improvement of flexibility and coilability of the pipeline, and reduces cost. And the flexible composite pipe prepared from the inner pipe does not lose flexibility along with the improvement of temperature resistance, so that the coilable property of the flexible composite pipe is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these should be considered as within the scope of the present invention.

Claims (10)

1. An inner pipe for a flexible composite pipe is characterized in that the inner pipe is sequentially provided with an inner layer, a middle layer and an outer layer from inside to outside;
the middle layer comprises a plurality of holes or meshes of a crossed net structure, which are used for the penetration of the inner layer and the outer layer, at least in the area covered by the inner layer and the outer layer, so that the inner layer, the outer layer and the middle layer are connected through the holes or the meshes of the crossed net structure to form a riveting structure.
2. The inner pipe for the flexible composite pipe as claimed in claim 1, wherein the inner layer is made of the resin with temperature resistance, permeation prevention and corrosion resistance, and the outer layer is made of the resin with temperature resistance, permeation prevention and corrosion resistance.
3. The inner tube for a flexible composite tube as claimed in claim 2, wherein the material of the inner layer is selected from one or more of polyethylene, polypropylene, polyvinylidene fluoride, polydodecalactam and polyphenylene sulfide, and the material of the outer layer is selected from one or more of polyethylene, polypropylene, polyvinylidene fluoride, polydodecalactam and polyphenylene sulfide.
4. An inner pipe for a flexible composite pipe according to claim 1, wherein said intermediate layer is a carcass layer having a porous structure or a cross-web structure.
5. The innerduct of claim 1, wherein the material of the intermediate layer is selected from the group consisting of a high modulus material or a low modulus material; the high modulus material is selected from engineering plastics; the low modulus material is selected from rubber or thermoplastic elastomer, the rubber is selected from ethylene propylene diene monomer, and the thermoplastic elastomer is selected from cross-linked polyethylene.
6. A method of preparing the inner tube for a flexible composite tube according to any one of claims 1 to 5, comprising the steps of:
s1, preparing an intermediate layer with meshes with holes or a crossed net structure;
and S2, connecting the inner layer, the outer layer and the middle layer through holes or meshes of a crossed net structure to form a riveting structure, so that the inner layer and the outer layer are respectively coated on the inner side wall and the outer side wall of the middle layer to form a complete tubular structure.
7. The method for preparing an inner tube for a flexible composite tube according to claim 6, wherein the step S1 comprises the steps of:
firstly, extruding the middle layer by using a No. 1 extruder, and then rolling and punching by using a roller press to form the middle layer with a porous structure; or
The intermediate layer was extruded using a No. 1 extruder, through a die design into an intermediate layer with cross-meshed structure cells.
8. The method for preparing an inner tube for a flexible composite tube according to claim 7, wherein the step S1 comprises the steps of:
extruding rubber into a pipeline with the inner diameter of 50-55mm and the outer diameter of 55-60mm by a special rubber machine, and vulcanizing by a continuous microwave and hot air vulcanization production line, wherein the production advancing speed is 1-5m/min, the vulcanization production line is 50-65m, and the vulcanization time is 20-35min; after vulcanization, carrying out hole rolling by multi-roller hole rolling equipment, wherein the diameter of each hole is 2mm, the number of the holes is 220-250/10 cm, and winding after hole rolling is finished to obtain the intermediate layer; or
Extruding a thermoplastic elastomer or a high-melting-point plastic into a pipeline with an inner diameter of 130-140mm, an outer diameter of 145-155mm and a surface porosity of 40% and with a mesh of a cross-mesh structure by a No. 1 extruder, soaking the pipeline in hot water to crosslink the pipeline, and winding after crosslinking to obtain the intermediate layer.
9. The method for manufacturing an inner tube for a flexible composite tube according to claim 7 or 8, wherein step S2 comprises the steps of:
and drawing the middle layer into a No. 2 extruder through a tractor, extruding the temperature-resistant, anti-seepage and corrosion-resistant resin through a die by a right-angle head die, and infiltrating the resin into the middle layer from the outside of the middle layer under the extrusion pressure of the die to form an inner layer and an outer layer of a riveting structure in the middle layer.
10. Flexible composite pipe, its characterized in that includes:
an inner pipe for a flexible composite pipe according to any one of claims 1 to 5 or produced by the production method according to any one of claims 6 to 9;
the reinforcing layer is made of steel belts or aramid fibers,
winding the steel belt or aramid fiber on the outer side wall of the inner pipe to form the reinforcing layer; or
Wrapping the aramid fiber on the outer side wall of the inner pipe to form the reinforcing layer;
the protective layer wraps the reinforcing layer, and the protective layer is made of polyethylene.
CN202210906198.4A 2022-07-29 2022-07-29 Inner pipe for flexible composite pipe, preparation method and flexible composite pipe Pending CN115560141A (en)

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CN202210906198.4A CN115560141A (en) 2022-07-29 2022-07-29 Inner pipe for flexible composite pipe, preparation method and flexible composite pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210906198.4A CN115560141A (en) 2022-07-29 2022-07-29 Inner pipe for flexible composite pipe, preparation method and flexible composite pipe

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