Flexible composite pipe for conveying high-pressure hydrogen and preparation method of flexible composite pipe

Abstract

The invention provides a flexible composite pipe for conveying high-pressure hydrogen and a preparation method of the flexible composite pipe. The flexible composite pipe includes: an inner liner; the barrier structure layer is adhered to the outer surface of the lining layer; the reinforcing layer is adhered to the outer surface of the barrier structure layer; and the outer protective layer is adhered to the outer surface of the reinforcing layer. By arranging the barrier structure layer, hydrogen in the lining layer can be effectively prevented from permeating into the reinforcing layer, the anti-corrosion and anti-permeation effects are achieved, the gas barrier property is achieved, the reinforcing layer can effectively improve the strength and rigidity of the composite pipe and enhance the pressure bearing performance of the composite pipe, the outer protection layer can effectively resist abrasion of the external environment, and the service life of the composite pipe is prolonged. And the composite pipe is protected from external damage. The structural design of the flexible composite pipe can effectively bear pressure generated in the high-pressure hydrogen conveying process, and safe operation of the pipeline is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen transport pipelines, and in particular to a flexible composite pipe for high-pressure hydrogen transport and a preparation method thereof. Background Art

[0002] The hydrogen energy industry is an emerging industry. Most of the existing hydrogen transmission pipelines are low-grade steel metal pipelines with limited pressure bearing capacity. To improve the pressure bearing capacity, the wall thickness needs to be increased, resulting in increased production, transportation and construction costs, reduced economic efficiency, and the inability to achieve high-pressure transmission of pure hydrogen. High-grade steel pipelines face hydrogen embrittlement problems and are still under research. They cannot be used for high-pressure pure hydrogen transmission. In addition, the energy consumption and carbon emissions of steel pipeline production, transportation, construction and installation, and post-maintenance are high. Hydrogen is a colorless and odorless gas that is difficult to liquefy, extremely easy to diffuse and penetrate, has a low ignition energy of 0.019mJ, is extremely flammable, and has an explosion limit of 4% to 75%. As a non-metallic pipeline for high-pressure pure hydrogen transportation, it needs to have high pressure bearing, high gas barrier, high air tightness, antistatic, flame retardant and other properties. The existing non-metallic pipelines for gas transmission in oil and gas fields have gas permeation problems in terms of structure and material selection, and most of the materials are non-conductive polymer materials, which cannot meet the above requirements at the same time. Summary of the invention

[0003] The main purpose of the present invention is to provide a flexible composite pipe for high-pressure hydrogen transportation and a preparation method thereof, so as to solve the problems of poor load-bearing capacity and poor air tightness in the prior art.

[0004] In order to achieve the above object, according to one aspect of the present invention, a flexible composite pipe for high-pressure hydrogen transportation is provided. The flexible composite pipe comprises: an inner lining layer; a barrier structure layer, the barrier structure layer is bonded to the outer surface of the inner lining layer; a reinforcement layer, the reinforcement layer is bonded to the outer surface of the barrier structure layer; and an outer protective layer, the outer protective layer is bonded to the outer surface of the reinforcement layer.

[0005] Furthermore, the lining layer includes: an antistatic layer; a barrier functional layer, the barrier functional layer is located on the outer circle of the antistatic layer; a high-strength layer, the high-strength layer is located on the outer circle of the barrier functional layer, a hot melt adhesive layer is provided between the antistatic layer and the barrier functional layer, a hot melt adhesive layer is provided between the barrier functional layer and the high-strength layer, or the antistatic layer, the barrier functional layer and the high-strength layer are directly hot-melt bonded.

[0006] Furthermore, the antistatic layer is obtained by extrusion molding of thermoplastic plastics, the thermoplastic plastics include at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK, the antistatic layer is modified by chopped carbon fiber CF, carbon nanotube CNT, graphene Grophene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and conductive carbon black CB, and the surface resistance of the inner surface of the antistatic layer is less than or equal to 1×106 Ω.

[0007] Furthermore, the barrier functional layer has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, and the high barrier polymer includes at least one of ethylene-vinyl alcohol polymer EVOH, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0008] Furthermore, the barrier functional layer has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, and the first polymer material includes polyethylene PE and polypropylene PP modified based on graphene Grophene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and montmorillonite nano-sheet materials.

[0009] Furthermore, the high-strength layer is obtained by extrusion molding a second polymer material having a tensile strength greater than or equal to 20 MPa and a tensile modulus greater than or equal to 500 MPa, and the second polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0010] Furthermore, the barrier structure layer includes an aluminum-plastic tape, which is spirally wound on the outer peripheral surface of the inner lining layer. The pitch of the aluminum-plastic tape is 1 / 2 to 1 / 3 of the width of the aluminum-plastic tape. The aluminum-plastic tape includes an inner heat-sealing layer, an aluminum foil and an outer heat-sealing layer connected in sequence. The aluminum foil is spirally wound on the inner lining layer. The inner heat-sealing layer is used for hot-melt bonding of the aluminum foil to the outer surface of the inner lining layer, and the outer heat-sealing layer is used for hot-melt bonding of the aluminum foil to the inner surface of the reinforcement layer.

[0011] Furthermore, the reinforcing layer is obtained by winding fiber pre-impregnated thermoplastic tape, wherein the fiber includes at least one of carbon fiber, glass fiber, and polyimide fiber, and the thermoplastic includes a polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0012] Furthermore, the outer protective layer is obtained by extrusion molding of a polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0013] According to another aspect of the present invention, there is provided a method for preparing a flexible composite pipe for high-pressure hydrogen transportation, the preparation method being used to prepare the above-mentioned flexible composite pipe for high-pressure hydrogen transportation, the preparation method comprising: integrating the antistatic layer, the barrier functional layer and the high-strength layer from the inside to the outside by multi-layer co-extrusion to obtain an inner lining layer; then preheating the outer surface of the inner lining layer, the inner surface of the barrier structure layer, the outer surface of the barrier structure layer, the inner surface of the reinforcement layer and the outer surface of the reinforcement layer in sequence by a hot air gun or infrared rays to a heat-weldable state, the barrier structure layer is spirally wound on the outer surface of the inner lining layer to achieve hot-melt bonding, the reinforcement layer is spirally wound on the outer surface of the barrier structure layer to achieve hot-melt bonding, the outer protective layer is extruded and coated on the outer surface of the reinforcement layer to achieve hot-melt bonding, and the flexible composite pipe for high-pressure hydrogen transportation is obtained.

[0014] By applying the technical solution of the present invention, the barrier structure layer can effectively prevent the hydrogen in the lining layer from penetrating into the FRP reinforcement layer, play a role in corrosion resistance and penetration resistance, and have gas barrier properties. The reinforcement layer can effectively improve the strength and rigidity of the composite pipe and enhance its pressure bearing performance. The outer protective layer can effectively resist the wear of the external environment and protect the composite pipe from external damage. The structural design of the flexible composite pipe can effectively withstand the pressure generated during the high-pressure hydrogen transportation process and ensure the safe operation of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A cross-sectional schematic diagram of a flexible composite pipe for high-pressure hydrogen transportation according to the present invention is shown;

[0017] The above drawings include the following reference numerals:

[0018] 1. Lining layer; 11. Antistatic layer; 12. Barrier functional layer; 13. High strength layer;

[0019] 2. Barrier structure layer;

[0020] 3. Enhancement layer;

[0021] 4. Outer protective layer. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0026] Combination Figure 1 As shown, according to a specific embodiment of the present invention, a flexible composite pipe for high-pressure hydrogen transportation is provided.

[0027] Specifically, Figure 1 As shown, the flexible composite pipe for high-pressure hydrogen transportation includes: an inner lining layer 1; a barrier structure layer 2, the barrier structure layer 2 is bonded to the outer surface of the inner lining layer 1; a reinforcement layer 3, the reinforcement layer 3 is bonded to the outer surface of the barrier structure layer 2; and an outer protective layer 4, the outer protective layer 4 is bonded to the outer surface of the reinforcement layer 3.

[0028] In this embodiment, the barrier structure layer 2 can effectively prevent the hydrogen in the inner lining layer 1 from penetrating into the FRP reinforcement layer 3, play a role in corrosion resistance and penetration resistance, and have gas barrier properties. The reinforcement layer 3 can effectively improve the strength and rigidity of the composite pipe and enhance its pressure bearing performance. The outer protective layer 4 can effectively resist the wear of the external environment and protect the composite pipe from external damage. The structural design of the flexible composite pipe can effectively withstand the pressure generated during the high-pressure hydrogen transportation process and ensure the safe operation of the pipeline.

[0029] Furthermore, the lining layer 1 includes: an antistatic layer 11; a barrier functional layer 12, the barrier functional layer 12 is located on the outer circle of the antistatic layer 11; a high-strength layer 13, the high-strength layer 13 is located on the outer circle of the barrier functional layer 12, a hot melt adhesive layer is provided between the antistatic layer 11 and the barrier functional layer 12, a hot melt adhesive layer is provided between the barrier functional layer 12 and the high-strength layer 13, or the antistatic layer 11, the barrier functional layer 12 and the high-strength layer 13 are directly hot-melt bonded.

[0030] This arrangement helps to provide better protection performance and increase the wear resistance and durability of the inner lining layer. The hot melt adhesive layer can effectively bond the various layers of materials, and delamination is not likely to occur. At the same time, the hot melt adhesive layer can also fill the tiny gaps between the various layers of materials, improve the sealing performance of the inner lining layer 1, and prevent external harmful substances from penetrating into the inner lining layer 1. In this way, the inner lining layer 1 has high gas barrier properties, antistatic properties, high pressure bearing capacity and high strength, etc., meeting the requirements of high-pressure pure hydrogen transportation.

[0031] Furthermore, the antistatic layer 11 is obtained by extrusion molding of thermoplastic plastics, and the thermoplastic plastics include at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK. The antistatic layer 11 is modified by chopped carbon fiber CF, carbon nanotube CNT, graphene Grophene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and conductive carbon black CB, and the surface resistance of the inner surface of the antistatic layer 11 is less than or equal to 1×10 6 Ω.

[0032] Such arrangement strengthens the conductive property of antistatic layer 11, improves the antistatic ability of antistatic layer 11.Such arrangement can effectively prevent the accumulation of static electricity, reduce the impact of static electricity on equipment and products, and improve the safety and stability of equipment and products.Simultaneously, the addition of materials such as chopped carbon fiber, carbon nanotube, graphene and derivative can also improve the mechanical properties of antistatic layer, increase its strength and wear resistance, and prolong service life.Therefore, by thermoplastic extrusion molding and through the modification of chopped carbon fiber, carbon nanotube, graphene and derivative, the antistatic layer can be made to have better performance and reliability.

[0033] Furthermore, the barrier functional layer 12 has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, and the high barrier polymer includes at least one of ethylene-vinyl alcohol polymer EVOH, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0034] This can effectively block the penetration of hydrogen. These high-barrier polymers have excellent gas barrier properties, can prevent the penetration of harmful substances such as oxygen, water vapor, odor, etc., maintain the stability of the internal environment of the liner 1, and effectively protect the quality of the composite pipe. At the same time, these high-barrier polymers also have good heat resistance, chemical resistance and mechanical properties.

[0035] Furthermore, the barrier functional layer 12 has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, and the first polymer material includes polyethylene PE and polypropylene PP modified based on graphene Grophene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and montmorillonite nano-sheet materials.

[0036] The addition of graphene and its derivatives to the polymer can improve the mechanical properties and gas barrier properties of the material, and the addition of montmorillonite nano-sheet material can increase the barrier effect of the material. This arrangement improves the gas barrier properties of the liner layer 1.

[0037] Furthermore, the high-strength layer 13 is obtained by extrusion molding a second polymer material having a tensile strength greater than or equal to 20 MPa and a tensile modulus greater than or equal to 500 MPa, and the second polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0038] This can ensure that the high-strength layer 13 has sufficient tensile strength and modulus. In addition, since these materials have good wear resistance and chemical corrosion resistance, the service life and stability of the high-strength layer 13 can be improved.

[0039] Furthermore, the barrier structure layer 2 includes an aluminum-plastic tape, which is spirally wound on the outer peripheral surface of the inner lining layer 1. The pitch of the aluminum-plastic tape is 1 / 2 to 1 / 3 of the width of the aluminum-plastic tape. The aluminum-plastic tape includes an inner heat-sealing layer, an aluminum foil and an outer heat-sealing layer connected in sequence. The aluminum foil is spirally wound on the inner lining layer 1. The inner heat-sealing layer is used for hot-melt bonding of the aluminum foil and the outer surface of the inner lining layer 1, and the outer heat-sealing layer is used for hot-melt bonding of the aluminum foil and the inner surface of the reinforcement layer.

[0040] This arrangement can improve the sealing performance and corrosion resistance of the barrier structure layer 2 and protect the inner lining layer 1 from erosion by the external environment. The spiral winding design of the aluminum-plastic tape can increase the stability and strength of the barrier structure layer 2, making it more suitable for long-term use. In addition, the hot-melt bonding of the inner heat-sealing layer and the outer heat-sealing layer can ensure the close combination of the aluminum foil with the inner lining layer 1 and the reinforcement layer 3, effectively preventing the penetration of gas, liquid or other substances and improving the barrier effect.

[0041] Furthermore, the reinforcing layer 3 is obtained by winding fiber pre-impregnated thermoplastic tape, wherein the fiber includes at least one of carbon fiber, glass fiber, and polyimide fiber, and the thermoplastic includes a polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0042] Fiber pre-impregnated thermoplastic tape is a composite tape with a thermoplastic matrix and pre-impregnated fiber reinforcement. This material is usually used to manufacture high-performance composite products, such as automotive parts, aerospace components, etc. Fiber pre-impregnated thermoplastic tape has excellent strength, stiffness and heat resistance, and also has good formability and processability, so it is widely used in the engineering field. The reinforcement layer 3 has very high strength and stiffness, which can effectively improve the bearing capacity and impact resistance of the overall structure. The fiber pre-impregnated thermoplastic tape can provide excellent heat resistance and corrosion resistance, so that the reinforcement layer 3 can still maintain stable performance in harsh environments. The fiber pre-impregnated thermoplastic tape winding manufacturing process is simple, low cost, high production efficiency, and can reduce the manufacturing cost of the overall structure.

[0043] Furthermore, the outer protective layer 4 is obtained by extrusion molding of a polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

[0044] In this way, the outer protective layer 4 can have high wear resistance and corrosion resistance, and also has good high temperature resistance and low temperature resistance. Different polymer materials can be selected according to specific use requirements, thereby improving the adaptability of the outer protective layer 4 to the environment and the external physical environment and extending the service life. In addition, these polymer materials have good processing properties, and a uniform and dense outer protective layer can be obtained through processes such as extrusion molding, thereby improving the quality and stability of the product.

[0045] According to another aspect of the present invention, a method for preparing a flexible composite pipe for high-pressure hydrogen transportation is provided. The preparation method is used to prepare the above-mentioned flexible composite pipe for high-pressure hydrogen transportation, and the preparation method comprises: integrating the antistatic layer, the barrier functional layer and the high-strength layer from the inside to the outside by multi-layer co-extrusion to obtain the inner lining layer 1; then the outer surface of the inner lining layer 1, the inner surface of the barrier structure layer 2, the outer surface of the barrier structure layer 2, the inner surface of the reinforcement layer 3, and the outer surface of the reinforcement layer 3 are preheated in sequence by a hot air gun or infrared rays to a heat-weldable state, the barrier structure layer 2 is spirally wound on the outer surface of the inner lining layer 1 to achieve hot-melt bonding, the reinforcement layer 3 is spirally wound on the outer surface of the barrier structure layer 2 to achieve hot-melt bonding, and the outer protective layer 4 is extruded and coated on the outer surface of the reinforcement layer 3 to achieve hot-melt bonding, so as to obtain a flexible composite pipe for high-pressure hydrogen transportation.

[0046] Compared with steel hydrogen pipes, non-metallic pipes are not only highly designable, lightweight, and free of hydrogen embrittlement risk, but also require no welding and are quick and easy to connect. They can also reduce carbon emissions by more than 30% and energy consumption by more than 50% throughout their entire life cycle from production to application, making them a highly promising development direction for hydrogen pipelines.

[0047] The present invention provides a flexible composite pipe for high-pressure hydrogen transportation and a preparation method thereof. Innovations are made in structural design, material selection and manufacturing technology so that the flexible composite pipe has high gas barrier properties, antistatic properties, high pressure bearing capacity and high strength, etc., to meet the requirements of high-pressure pure hydrogen transportation.

[0048] Antistatic modification is a treatment method for materials to enhance their antistatic properties. Static electricity is the accumulation of electric charges caused by friction or contact on the surface of materials, which can easily cause problems such as dust adsorption, electric shock and equipment failure. Therefore, for materials that need antistatic properties, some modification measures can be taken, such as adding antistatic agents, surface coatings or changing the material structure to improve the antistatic properties of the material. These modification methods can make the material have good antistatic properties, so that it can be used in the fields of electronics, chemical industry, textiles, etc.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible composite pipe for high-pressure hydrogen transportation, It is characterized in that include: Lining layer (1); A barrier structure layer (2), wherein the barrier structure layer (2) is bonded to the outer surface of the lining layer (1); A reinforcing layer (3), the reinforcing layer (3) being bonded to the outer surface of the barrier structure layer (2); An outer protective layer (4), the outer protective layer (4) being bonded to the outer surface of the reinforcing layer (3).

2. The flexible composite pipe for high-pressure hydrogen transportation according to claim 1, It is characterized in that The inner lining layer (1) comprises: Antistatic layer (11); A barrier function layer (12), wherein the barrier function layer (12) is located on the outer circle of the antistatic layer (11); A high-strength layer (13), the high-strength layer (13) is located on the outer circle of the barrier function layer (12), a hot melt adhesive layer is provided between the antistatic layer (11) and the barrier function layer (12), a hot melt adhesive layer is provided between the barrier function layer (12) and the high-strength layer (13), or the antistatic layer (11), the barrier function layer (12) and the high-strength layer (13) are directly hot-melt bonded.

3. The flexible composite pipe for high-pressure hydrogen transportation according to claim 2, It is characterized in that The antistatic layer (11) is obtained by extrusion molding of thermoplastic plastics, wherein the thermoplastic plastics include at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK. The antistatic layer (11) is modified by chopped carbon fiber CF, carbon nanotube CNT, graphene Grephene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and conductive carbon black CB. The surface resistance of the inner surface of the antistatic layer (11) is less than or equal to 1×10 6 Ω.

4. The flexible composite pipe for high-pressure hydrogen transportation according to claim 2, It is characterized in that The barrier functional layer (12) has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, wherein the high barrier polymer includes at least one of ethylene vinyl alcohol polymer EVOH, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

5. The flexible composite pipe for high-pressure hydrogen transportation according to claim 2, It is characterized in that The barrier functional layer (12) has a hydrogen permeability coefficient less than or equal to 1×10 -14 cm 3 cm / (cm 2 ·s·Pa) is obtained by extrusion molding, wherein the first polymer material includes polyethylene PE and polypropylene PP modified based on graphene Grophene and its derivatives, graphene oxide GO, reduced graphene oxide rGO, and montmorillonite nano-sheet materials.

6. The flexible composite pipe for high-pressure hydrogen transportation according to claim 2, It is characterized in that The high-strength layer (13) is obtained by extrusion molding a second polymer material having a tensile strength greater than or equal to 20 MPa and a tensile modulus greater than or equal to 500 MPa, wherein the second polymer material comprises at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

7. The flexible composite pipe for high-pressure hydrogen transportation according to claim 1, It is characterized in that The barrier structure layer (2) comprises an aluminum-plastic tape, which is spirally wound on the outer peripheral surface of the inner lining layer (1), and the pitch of the aluminum-plastic tape is 1 / 2 to 1 / 3 of the width of the aluminum-plastic tape. The aluminum-plastic tape comprises an inner heat-sealing layer, an aluminum foil and an outer heat-sealing layer connected in sequence. The aluminum foil is spirally wound on the inner lining layer (1), and the inner heat-sealing layer is used for hot-melt bonding of the aluminum foil and the outer surface of the inner lining layer (1), and the outer heat-sealing layer is used for hot-melt bonding of the aluminum foil and the inner surface of the reinforcing layer.

8. The flexible composite pipe for high-pressure hydrogen transportation according to claim 1, It is characterized in that The reinforcing layer (3) is obtained by winding fiber pre-impregnated thermoplastic tape, wherein the fiber includes at least one of carbon fiber, glass fiber, and polyimide fiber, and the thermoplastic includes a polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

9. The flexible composite pipe for high-pressure hydrogen transportation according to claim 8, It is characterized in that The outer protective layer (4) is obtained by extrusion molding of the polymer material, and the polymer material includes at least one of polyethylene PE, polypropylene PP, polyphenylene sulfide PPS, polyamide PA, and polyaryletherketone PAEK.

10. A method for preparing a flexible composite pipe for high-pressure hydrogen transportation, It is characterized in that The preparation method is used to prepare the flexible composite pipe for high-pressure hydrogen transportation according to any one of claims 1 to 9, and the preparation method comprises: The antistatic layer, the barrier function layer and the high-strength layer are integrally formed from the inside to the outside by multi-layer co-extrusion to obtain an inner lining layer (1); The outer surface of the inner lining layer (1), the inner surface of the barrier structure layer (2), the outer surface of the barrier structure layer (2), the inner surface of the reinforcement layer (3), and the outer surface of the reinforcement layer (3) are preheated in sequence by a hot air gun or infrared rays to a heat-weldable state; the barrier structure layer (2) is spirally wound on the outer surface of the inner lining layer (1) to achieve hot-melt bonding; the reinforcement layer (3) is spirally wound on the outer surface of the barrier structure layer (2) to achieve hot-melt bonding; the outer protective layer (4) is extruded and coated on the outer surface of the reinforcement layer (3) to achieve hot-melt bonding to obtain the flexible composite pipe for high-pressure hydrogen transportation.

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