A fiber reinforced filament wound plastic lined pipe with plastic lining in marine environment

Abstract

The present application provides a kind of fiber reinforced winding plastic lined pipe in marine environment with plastic lining, the present application includes from inside to outside inner tube, fiber winding layer, explosion-proof layer, reinforcing layer, outer sealing layer and hydrophobic layer, the inner tube material includes modified high-density polyethylene, nylon, nylon 6, inner tube outer surface has fiber winding layer, its material includes CF resin-based long fiber composite material, fiber winding layer is equipped with a layer of explosion-proof layer, the inner layer material includes modified high-density polyethylene, nylon, nylon 6, the grid slot of the explosion-proof layer is connected with fiber winding layer and plays the role of bonding, the grid slot structure of outer side is equipped with explosion-proof net of metal material, the outer layer of the explosion-proof net is a layer of CF / PPS fiber winding reinforcing layer, the outer portion of the reinforcing layer is a layer of HDPE as outer sealing layer.The present application has the characteristics of light weight, high specific modulus, good safety and the like while ensuring good sealing, ductility and crack resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine composite pipe, in particular to a fiber-reinforced plastic-lined pipe with plastic lining in marine environment. BACKGROUND

[0002] Compared with traditional metal material pipes, thermoplastic composite pipes can greatly reduce their own weight while ensuring strength, and compared with plastic pipes, they can provide stronger structural strength, and the recyclability of thermoplastic materials can achieve true energy saving and material saving, light weight and high strength, and at the same time, they have good corrosion resistance, and are more convenient for maintenance and replacement of damaged pipes.

[0003] The existing patent with the patent number CN 213089013U discloses an aluminum alloy plastic-lined pipe with a PPR inner layer, which provides an aluminum alloy plastic-lined pipe with a PPR inner layer, which includes a PPR inner pipe, and the inner pipe outer surface is sleeved with a blast-proof net, so that the strength is higher, the toughness is stronger, and the safety is more reliable. The inventor found that the following problems in the prior art have not been well solved in the process of implementing this scheme: 1. The weight of the pipe itself is large; 2. The corrosion resistance is general.

[0004] The existing patent with the patent number CN 213871473U discloses a glass fiber winding composite HDPE pipe, which usually uses an antibacterial agent to make antibacterial plastic, and through the setting of the multi-layer structure, the corrosion and bacteria resistance performance can be effectively increased, and the overall compressive strength is higher, and the service life is increased. The inventor found that the following problems in the prior art have not been well solved in the process of implementing this scheme: the antibacterial agent pollutes the environment to a certain extent. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a fiber-reinforced plastic-lined pipe with plastic lining in marine environment, which solves the problems of low strength of existing aluminum plastic pipes, easy corrosion in marine environment, broken pipe transportation after fracture, and the like, and the replacement of existing chemical corrosion-resistant materials, and the use of modified plastic for gas transmission, so that the gas permeation rate is reduced by about 20%. The technical means adopted by the present application are as follows:

[0006] A kind of fiber reinforced winding plastic-lined pipe in marine environment with plastic lining, from inside to outside including inner tube, fiber winding layer, explosion-proof layer, reinforcing layer, outer sealing layer and hydrophobic layer, the inner tube material includes modified high-density polyethylene, nylon, nylon 6, inner tube outer surface has fiber winding layer, its material includes CF resin-based long fiber composite material, fiber winding layer is equipped with a layer of explosion-proof layer, the inner layer material includes modified high-density polyethylene, nylon, nylon 6, the grid slot of the explosion-proof layer is connected with fiber winding layer and plays the role of bonding, the explosion-proof net of outer side is equipped with grid slot structure assembly metal material, the outer layer of the explosion-proof net is a layer of CF / PPS fiber winding reinforcing layer, the outer layer of the reinforcing layer is a layer of HDPE as outer sealing layer.

[0007] Further, the pipe is used for hydrogen transmission, and the inner tube is in direct contact with hydrogen.

[0008] Further, the resin-based material includes PPS and PEEK material, and the fiber content of the composite material is between 70-80%.

[0009] Further, the fiber winding angle is in a positive and negative cycle of 40-60 °.

[0010] Further, the grid slot is rhombic, the shape of the rhombic grid slot matches the shape of the explosion-proof net, and the angle in the laying process is between 40-60 °, which matches the winding angle of the fiber winding layer.

[0011] Further, the outermost hydrophobic layer is a PPS superhydrophobic coating.

[0012] The present application provides a kind of fiber reinforced winding plastic-lined pipe with plastic lining in marine environment, with the following beneficial effects:

[0013] 1, the device replaces traditional aluminum alloy layer with thermoplastic resin fiber winding layer, and modified plastic is selected for lining, so that the pipeline has the characteristics of light weight, high specific modulus, good safety, etc. while ensuring good sealing, ductility and crack resistance.

[0014] 2, the device adopts double winding layer structure, which ensures the structural strength of the inner tube and the explosion-proof layer, and at the same time ensures the strength of the pipe itself, which can effectively prevent secondary damage caused by flying debris when damaged.

[0015] 3, the device sets a superhydrophobic coating on the outermost layer of the pipeline to avoid the attachment of seawater and marine organisms, delay corrosion and aging, prolong the service life, improve economic benefits, and is more conducive to environmental protection than chemical corrosion inhibitors. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the layer structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the explosion-proof mesh structure of the present invention;

[0019] In the diagram: 1-Inner tube; 2-Fiber winding layer; 3-Mesh groove; 4-Explosion-proof mesh; 5-Reinforcing layer; 6-Sealing layer; 7-Superhydrophobic coating. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 , Figure 2As shown, the embodiment of the present application discloses a kind of plastic lining of fiber reinforced winding plastic lining pipe under marine environment, including inner tube 1, the material of the inner tube 1 is modified high-density polyethylene, nylon, nylon 6 etc., under the premise of guaranteeing sealing effect, improve impact resistance, can long-term effective transport hydrogen and not react with it, reduce the permeability of material, permeability is reduced by about 20%, its thickness is 14-18mm, inner diameter is 150-200mm;Inner tube 1 outer surface has fiber winding layer 2, its material can use CF resin-based long fiber composite material, resin-based material includes but is not limited to PPS, PEEK material etc., it has the characteristics of high strength, corrosion resistance, the layer is wound by machine, at 40-60 ° angle, positive and negative cycle lay-up to ensure structural strength, wrapped in inner tube 1 outside, while having the characteristics of high strength, corrosion resistance, can reduce the weight of pipeline itself, winding layer can select T700 / PPS etc. thermoplastic resin-based material, its body ratio is 0.7-0.8, single layer thickness is 0.1mm, 80 layers are laid;Fiber winding layer 2 is equipped with a layer of explosion-proof layer, the inner side of its explosion-proof layer is connected with fiber winding layer 2 using the grid slot 3 of inner tube material and plays the role of bonding, the outer side is provided with grid slot structure assembled with explosion-proof net 4 of metal material, to prevent the splashing caused by explosion due to internal pressure uneven;Its outer layer is a layer of fiber winding reinforcing layer 5 of same material to increase structural strength, ensure the stability of pipeline work, avoid pipeline rupture, structure uses the same material parameters as above lay-up to lay 20 layers;It is wrapped with a layer of inner material as external sealing layer 6, further ensure the sealing effect of structure, avoid gas overflow inside, avoid corrosion caused by direct contact of reinforcing layer 5 with seawater to cause strength to decrease;The outermost layer is PPS superhydrophobic coating 7, uniformly coated on the outside of sealing layer 6, isolate seawater and air to slow down the corrosion and aging of pipeline outer wall, prolong service life.

[0022] In the embodiment, the fiber uses long fiber carbon fiber material, the resin-based material includes but is not limited to PPS, PEEK and other materials, the fiber content of composite material is between 70-80%, and the fiber winding angle is between 40-60 ° for positive and negative cycle lay-up to ensure structural strength.

[0023] The grid slot is a diamond-shaped slot, the shape of the grid slot and the shape of the explosion-proof net match each other, and a reinforcing layer is additionally provided outside to ensure strength, and the acute angle number in the structure is between 40-60 ° to match the fiber winding layer.

[0024] The embodiment can effectively ensure the transmission of hydrogen gas, replace the aluminum alloy material with the CF long fiber thermoplastic resin-based composite material winding layer while ensuring the structural strength, reduce the weight of the pipeline as a whole, further ensure the pipeline strength by adding the fiber winding reinforcing layer, avoid the splashing of fragments by adding the explosion-proof layer inside, improve the safety factor, finally increase the sealing layer and the corrosion-resistant coating to ensure the integrity of the pipeline, protect the internal structure of the pipeline, slow down the corrosion and aging, reduce the impact on the environment, and improve the service life of the pipeline; the bearing pressure of the embodiment is above 5MPa, which can meet the daily transportation of the hydrogen pipeline, and the burst pressure is above 54MPa, which can cope with the sudden situation of uneven gas pressure.

[0025] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fiber reinforced filament wound plastic lined pipe for use in a marine environment having a plastic lining, characterized in that, From inside to outside, it includes inner tube, fiber winding layer, explosion-proof layer, reinforcing layer, outer sealing layer and hydrophobic layer, the material of the inner tube includes modified high-density polyethylene, nylon, nylon 6, the outer surface of the inner tube has a fiber winding layer, the material of which includes CF resin-based long fiber composite material, the fiber winding layer is covered with an explosion-proof layer, the inner layer material of which includes modified high-density polyethylene, nylon, nylon 6, the grid slot of the explosion-proof layer is connected with the fiber winding layer to play a bonding role, the outer side is provided with a grid slot structure assembled with metal material explosion-proof net, the outer layer of the explosion-proof net is a reinforcing layer of CF / PPS fiber winding, the outer layer of the reinforcing layer is a layer of HDPE as an outer sealing layer; The pipe is used for hydrogen transmission, the inner tube is in direct contact with hydrogen; the thickness of the inner tube is 14-18mm, the inner diameter is 150-200mm, and the hydrogen can be effectively transported for a long time without reaction; The fiber winding layer is wound by machine at an angle of 40-60° in positive and negative cycles, the winding layer is made of T700 / PPS thermoplastic resin-based material, the volume fraction is 0.7-0.8, the single-layer thickness is 0.1mm, and 80 layers are laid; the resin-based material of the fiber winding layer includes PPS and PEEK materials, and the fiber content of the composite material is between 70-80%; The grid slot is rhombic, the shape of the rhombic grid slot matches the shape of the explosion-proof net, the angle during laying is between 40-60°, which matches the winding angle of the fiber winding layer; The reinforcing layer is laid with the same material parameters as the fiber winding layer for 20 layers, the bearing pressure of the plastic-lined pipe is above 5MPa, which meets the daily transportation of hydrogen pipeline, the burst pressure is above 54MPa, which can deal with the sudden situation of uneven gas pressure.

2. The fiber reinforced, spool laminated plastic pipe with internal plastic lining for use in marine environments according to claim 1, characterized in that, The fiber winding angle is between 40-60° for positive and negative cycle laying.

3. The fiber reinforced, spool laminated plastic pipe with internal plastic lining for use in marine environments as claimed in claim 1, wherein, The outermost hydrophobic layer is a PPS super-hydrophobic coating.

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