High-performance composite pipeline for hydrogen transmission and method for manufacturing the same

Abstract

This invention provides a high-performance composite pipe for hydrogen transportation and its preparation method, relating to the field of composite pipe technology. The high-performance composite pipe for hydrogen transportation comprises, from the inside out, a polymer inner layer, an adhesive resin layer, a barrier layer, another adhesive resin layer, a reinforcing layer, another adhesive resin layer, and a polymer outer layer. The adhesive resin layer comprises, by weight, the following raw materials: 5-15 parts urea-formaldehyde resin, 1-5 parts acrylate resin, 1-5 parts maleic anhydride graft copolymer, 1-2 parts polycarboxylic acid, 1-2 parts ethylene glycol, 0.1-0.5 parts filler, and 0.3-1.2 parts antioxidant. It can significantly improve the pressure-bearing capacity of the pipe, reduce its weight, and facilitate installation while ensuring strong resistance to hydrogen permeation during hydrogen transportation.

Description

Technical Field

[0001] This invention relates to the field of composite pipeline technology, and more specifically, to a high-performance composite pipeline and its preparation method. Background Technology

[0002] In recent years, hydrogen has become widely known as a clean energy source. Major energy-producing countries worldwide have formulated hydrogen energy development goals and strategies, investing heavily in research and development. With the development of hydrogen energy and the maturation and improvement of related technologies, large-scale centralized hydrogen production and long-distance hydrogen transportation are future trends. Establishing a high-pressure pure hydrogen transportation pipeline network is the ultimate goal of building a hydrogen society. However, hydrogen has characteristics such as high chemical reactivity, low density, and high diffusion coefficient. Prolonged contact between pipeline materials and hydrogen can cause hydrogen to penetrate the material's interior, leading to metal material damage, accelerated crack propagation, and decreased fracture toughness, resulting in risks such as hydrogen embrittlement, permeation, and leakage. Therefore, how to reduce the cost and safety risks of pipeline hydrogen transportation has always been a hot topic of global discussion in the industry. Summary of the Invention

[0003] The purpose of this invention is to provide a high-performance composite pipe for hydrogen transportation, which, while ensuring strong resistance to hydrogen permeation during hydrogen transportation, greatly improves the pressure-bearing capacity of the pipe, reduces the weight of the pipe itself, and makes it easier to install.

[0004] Another object of the present invention is to provide a method for preparing a high-performance composite pipeline for hydrogen transportation, which is used to prepare the above-mentioned high-performance composite pipeline for hydrogen transportation.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] This invention proposes a high-performance composite pipe for hydrogen transportation, which, from the inside out, comprises a polymer inner layer, an adhesive resin layer, a barrier layer, an adhesive resin layer, a reinforcing layer, an adhesive resin layer, and a polymer outer layer.

[0007] The adhesive resin layer comprises the following raw materials by weight: 5-15 parts urea-formaldehyde resin, 1-5 parts acrylate resin, 1-5 parts maleic anhydride graft copolymer, 1-2 parts polycarboxylic acid, 0.1-0.5 parts filler and 0.3-1.2 parts antioxidant.

[0008] This invention proposes a method for preparing a high-performance composite pipeline for hydrogen transportation, comprising the following steps:

[0009] S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer.

[0010] S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 40-60°. The adhesive resin layer is extruded and coated on the second high-barrier co-extruded film layer.

[0011] S3. The fibers are woven to obtain a woven fiber layer. An adhesion promoter is sprayed on the surface of the woven fiber layer. The woven fiber layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. A curing agent is sprayed on the surface of the woven fiber layer and heated.

[0012] Alternatively, metal wires can be braided to obtain a metal wire layer, and the metal wire layer can be cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2.

[0013] S4. The adhesive resin layer is extruded and coated onto the braided fiber layer or braided metal wire layer treated in step S3. Finally, the polymer outer layer is extruded and coated onto the braided fiber layer or braided metal wire layer to obtain the high-performance composite pipe.

[0014] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0015] In this invention, a barrier layer reduces the permeability of hydrogen to the pipeline, preventing risks such as hydrogen embrittlement and leakage. A reinforcing layer enhances the pipeline's pressure resistance, preventing cracks caused by compression deformation. Adhesive resin layers are placed between the inner polymer layer and the barrier layer, the barrier layer and the reinforcing layer, and the reinforcing layer and the outer polymer layer. The adhesive properties of the resin tightly connect the layers, improving the bonding strength and preventing delamination of the composite pipe. Simultaneously, the reinforcing layer is positioned outside the barrier layer, protecting it from hydrogen permeation and ensuring its pressure resistance.

[0016] The adhesive resin layer is mainly made of urea-formaldehyde resin and acrylic resin. Urea-formaldehyde resin has high bonding strength, strength and hardness, heat resistance, corrosion resistance, good coating properties and low self-consumption. Acrylic resin can dry quickly, has strong adhesion, good weather resistance and chemical stability. Maleic anhydride graft copolymer has good compatibility. Under the condition of other additives, the blending and modification of these resins can improve the adhesion of the adhesive resin layer and further improve the tightness of the connection between the layers.

[0017] In this invention, by extruding and coating the adhesive resin layer onto the surface of the polymer inner layer, the second high-barrier co-extruded film layer, and the braided fiber layer / braided metal wire layer, the uniformity of the adhesive resin layer can be improved, the inconsistent bonding degree between different positions of each layer can be avoided, which is beneficial to improving the barrier layer's resistance to hydrogen permeation, improving the reinforcing layer's pressure-bearing capacity of the pipeline, improving the bonding capacity between each layer, and ensuring the safety of hydrogen transportation through the pipeline.

[0018] The first high-barrier co-extruded film layer is wound around the polymer inner layer covered by the adhesive resin layer, and then the first high-barrier co-extruded film layer is wrapped around the second high-barrier co-extruded film layer. The two film layers are interleaved, which can increase the density and thickness of the film layer, thereby improving the barrier layer's ability to block hydrogen.

[0019] A second high-barrier co-extruded film layer, coated with an adhesive resin layer, is formed by cross-winding a braided fiber layer or braided metal wire layer. This enhances the pressure resistance of the pipeline by utilizing the pressure-resistant properties of the braided fiber layer or braided metal wire layer. Furthermore, spraying an adhesion promoter onto the surface of the braided fiber layer improves the surface polarity, increasing the adhesion between the fiber layer and the second high-barrier film layer and the polymer outer layer, thus improving the tightness of the bond between them. Spraying a curing agent after coating the braided fiber layer with the second high-barrier film layer accelerates the molding speed of the fiber layer, thereby increasing the pipeline production speed. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise stated, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0021] A high-performance composite pipe for hydrogen transportation comprises, from the inside out, a polymer inner layer, an adhesive resin layer, a barrier layer, an adhesive resin layer, a reinforcing layer, an adhesive resin layer, and a polymer outer layer.

[0022] The adhesive resin layer comprises the following raw materials by weight: 5-15 parts urea-formaldehyde resin, 1-5 parts acrylate resin, 1-5 parts maleic anhydride graft copolymer, 1-2 parts polycarboxylic acid, 0.1-0.5 parts filler and 0.3-1.2 parts antioxidant.

[0023] Furthermore, the method for preparing the adhesive resin includes the following steps:

[0024] Blending urea-formaldehyde resin and acrylate resin yields substance A;

[0025] Polycarboxylic acid is added to water and stirred for 5-10 minutes to obtain substance B.

[0026] Add filler to substance B, heat for 10-30 minutes, then add substance A and maleic anhydride graft copolymer, homogenize for 20-40 minutes, then add antioxidant, stir and mix for 10-20 minutes, and extrude to obtain the product.

[0027] In this process, the maleic anhydride graft copolymer is maleic anhydride-grafted polyethylene, polycarboxylic acid is used as a stabilizer, fillers enhance the adhesion of the adhesive resin, and antioxidants improve the fatigue resistance and durability of the adhesive resin. Preferably, the filler is starch or kaolin, and the antioxidant is polyvinyl alcohol or polyvinyl acetate emulsion.

[0028] In the preparation process, a filler is first added to substance B, followed by heating to form a gel-like liquid. Then, substance A and maleic anhydride graft copolymer are added, and homogenization is performed. During this process, the gel-like liquid encapsulates substance A and maleic anhydride to form microcapsules. In use, an adhesive resin layer is extruded to coat the inner polymer layer, barrier layer, and reinforcing layer. During extrusion, substance A and maleic anhydride graft copolymer encapsulated in the gel-like liquid precipitate, achieving a slow-release effect and enhancing the bonding strength between layers. Furthermore, under pressure, substance A and maleic anhydride graft copolymer can continue to be slowly released, thus improving the durability of the adhesive resin layer and helping to extend the service life of the pipeline. First, the initial tack of the adhesive resin is improved by the filler, and then the tack is strengthened by urea-formaldehyde resin, acrylate resin, and maleic anhydride graft copolymer, which helps to increase the viscosity of the adhesive resin layer and improve the bonding strength between the layers.

[0029] Furthermore, both the inner and outer polymer layers are made of polyethylene, and the barrier layer includes a first high-barrier co-extruded film layer and a second high-barrier co-extruded film layer. The high-barrier co-extruded film is one or more of nylon co-extruded film, EVOH co-extruded film, PVDC co-extruded film, and PVC co-extruded film. Preferably, the polyethylene is polyethylene grade 100, specifically Shanghai Petrochemical YGH041.

[0030] In other embodiments, the high-barrier co-extruded film is a nylon co-extruded film, an EVOH co-extruded film, a PVDC co-extruded film, and a PVC co-extruded film. The manufacturing method involves stacking the nylon co-extruded film, EVOH co-extruded film, PVDC co-extruded film, PVC co-extruded film, and nylon co-extruded film sequentially from bottom to top, and pressing them at 140-160℃ and 120-140 GPa. Among these, the EVOH co-extruded film's barrier performance decreases somewhat under high humidity environments and is costly; the PVC co-extruded film possesses both moisture-blocking and high-barrier properties; the PVDC co-extruded film has good flexibility; and the nylon co-extruded film has good barrier properties and high strength. By sequentially laminating the co-extruded films to obtain a high-barrier co-extruded film, its barrier performance can be further improved, which is beneficial for enhancing the pipeline's impermeability. Simultaneously, it can be used in conjunction with a reinforcing layer to enhance the pipeline's pressure-bearing capacity.

[0031] Furthermore, the reinforcing layer is a braided fiber layer or a braided metal wire layer. The braided fiber layer is one or more of the following: glass fiber reinforced nylon fiber, basalt fiber, polyphenylene sulfide fiber, ultra-high strength high modulus polyethylene fiber, poly(p-phenylene benzobisoxazole) fiber, polyimide fiber, and polytetrafluoroethylene fiber. The braided metal wire layer is galvanized steel wire.

[0032] A method for preparing a high-performance composite pipeline for hydrogen transportation includes the following steps:

[0033] S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer.

[0034] S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 40-60°. The adhesive resin layer is extruded and coated on the second high-barrier co-extruded film layer.

[0035] S3. The fibers are woven to obtain a woven fiber layer. An adhesion promoter is sprayed on the surface of the woven fiber layer. The woven fiber layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. A curing agent is sprayed on the surface of the woven fiber layer and heated.

[0036] Alternatively, metal wires can be braided to obtain a metal wire layer, and the metal wire layer can be cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2.

[0037] S4. The adhesive resin layer is extruded and coated onto the braided fiber layer or braided metal wire layer treated in step S3. Finally, the polymer outer layer is extruded and coated onto the braided fiber layer or braided metal wire layer to obtain the high-performance composite pipe.

[0038] During the cross-winding process, the cross-winding is performed at least twice. This enhances the ability of the barrier layer and reinforcement layer to improve the pipeline, making the pipeline more resistant to hydrogen permeation and stronger in terms of pressure resistance.

[0039] Furthermore, in step S4, after extruding and wrapping the polymer outer layer with the braided fiber layer or braided metal wire layer, the composite pipe is fitted onto a mold, and the mold is cold-pressed at 100-150 MPa for 10-30 minutes. This compression breaks down the microcapsules in the adhesive resin layer, enhancing the adhesion between the layers, improving their bonding, and significantly improving the mechanical properties of the pipe.

[0040] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0041] Example 1

[0042] A method for preparing a high-performance composite pipeline for hydrogen transportation includes the following steps:

[0043] Preparation of adhesive resin layer:

[0044] Raw materials: 5kg urea-formaldehyde resin, 1kg acrylate resin, 1kg maleic anhydride graft copolymer (maleic anhydride grafted polyethylene), 1kg polycarboxylic acid, 0.1kg filler (starch) and 0.3kg antioxidant (polyvinyl alcohol);

[0045] Preparation method: urea-formaldehyde resin and acrylate resin are blended to obtain substance A;

[0046] Polycarboxylic acid was added to water and stirred for 5 minutes to obtain substance B.

[0047] Add filler to substance B, heat for 10 min, then add substance A and maleic anhydride graft copolymer, homogenize for 20 min, then add antioxidant, stir and mix for 10 min, and set aside.

[0048] Preparation of composite pipes:

[0049] S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer.

[0050] S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 40°. The adhesive resin layer is then extruded and coated onto the second high-barrier co-extruded film layer.

[0051] S3. The fibers are woven to obtain a woven fiber layer. An adhesion promoter is sprayed on the surface of the woven fiber layer. The woven fiber layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. A curing agent is sprayed on the surface of the woven fiber layer and heated.

[0052] S4. Extrude the adhesive resin layer onto the braided fiber layer treated in step S3, and finally extrude the outer polymer layer to wrap the braided fiber layer to obtain a composite pipe. Fit the composite pipe onto the mold and cold press the mold at 100MPa for 10 minutes.

[0053] In this embodiment, both the inner and outer polymer layers are polyethylene, the high-barrier co-extruded film is a nylon co-extruded film, and the woven fiber layer is glass fiber reinforced nylon fiber. In steps S2 and S3, the number of cross-winding operations is 2.

[0054] Example 2

[0055] A method for preparing a high-performance composite pipeline for hydrogen transportation includes the following steps:

[0056] Preparation of adhesive resin layer:

[0057] Raw materials: 10kg urea-formaldehyde resin, 3kg acrylate resin, 2kg maleic anhydride graft copolymer (maleic anhydride grafted polyethylene), 1.5kg polycarboxylic acid, 0.3kg filler (kaolin) and 0.5kg antioxidant (polyvinyl acetate emulsion);

[0058] Preparation method: urea-formaldehyde resin and acrylate resin are blended to obtain substance A;

[0059] Polycarboxylic acid was added to water and stirred for 8 minutes to obtain substance B.

[0060] Add filler to substance B, heat for 20 min, then add substance A and maleic anhydride graft copolymer, homogenize for 30 min, then add antioxidant, stir and mix for 15 min, and set aside.

[0061] Preparation of composite pipes:

[0062] S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer.

[0063] S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 50°. The adhesive resin layer is then extruded and coated onto the second high-barrier co-extruded film layer.

[0064] S3. The fibers are woven to obtain a woven fiber layer. An adhesion promoter is sprayed on the surface of the woven fiber layer. The woven fiber layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. A curing agent is sprayed on the surface of the woven fiber layer and heated.

[0065] S4. Extrude the adhesive resin layer onto the braided fiber layer treated in step S3, and finally extrude the outer polymer layer to wrap the braided fiber layer to obtain a composite pipe. Fit the composite pipe onto the mold and cold press the mold at 120MPa for 20min.

[0066] In this embodiment, both the inner and outer polymer layers are polyethylene, the high-barrier co-extruded film is an EVOH co-extruded film, and the woven fiber layer is ultra-high strength high-modulus polyethylene fiber. In steps S2 and S3, the number of cross-winding operations is 4.

[0067] Example 3

[0068] A method for preparing a high-performance composite pipeline for hydrogen transportation includes the following steps:

[0069] Preparation of adhesive resin layer:

[0070] Raw materials: 15kg urea-formaldehyde resin, 5kg acrylate resin, 5kg maleic anhydride graft copolymer (maleic anhydride grafted polyethylene), 2kg polycarboxylic acid, 0.5kg filler (kaolin) and 1.2kg antioxidant (polyvinyl acetate emulsion);

[0071] Preparation method: urea-formaldehyde resin and acrylate resin are blended to obtain substance A;

[0072] Polycarboxylic acid was added to water and stirred for 10 minutes to obtain substance B.

[0073] Add filler to substance B, heat for 30 min, then add substance A and maleic anhydride graft copolymer, homogenize for 40 min, then add antioxidant, stir and mix for 20 min, and set aside.

[0074] Preparation of composite pipes:

[0075] S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer.

[0076] S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 60°. The adhesive resin layer is then extruded and coated onto the second high-barrier co-extruded film layer.

[0077] S3. The metal wires are braided to obtain a metal wire layer, and the metal wire layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2.

[0078] S4. Extrude the adhesive resin layer onto the braided metal wire layer treated in step S3, and finally extrude the polymer outer layer to wrap the braided metal wire layer to obtain a composite pipe. Set the composite pipe onto the mold and cold press the mold at 150MPa for 30 minutes.

[0079] In this embodiment, both the inner and outer polymer layers are polyethylene, the high-barrier co-extruded film is a PVC co-extruded film, the braided metal wire layer is galvanized steel wire, and the cross-winding is performed 6 times in steps S2 and S3.

[0080] Example 4

[0081] The difference between this embodiment and Embodiment 1 is that the high-barrier co-extruded film is a nylon co-extruded film, an EVOH co-extruded film, a PVDC co-extruded film, and a PVC co-extruded film. The manufacturing method is as follows: the nylon co-extruded film, EVOH co-extruded film, PVDC co-extruded film, PVC co-extruded film, and nylon co-extruded film are stacked sequentially from bottom to top and pressed at 140°C and 120 GPa.

[0082] Comparative Example 1

[0083] The difference between this comparative example and Example 1 is that the adhesive resin layer is maleic anhydride-grafted polyethylene.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 1 is that the adhesive resin layer is prepared by directly mixing the raw materials and then extruding them.

[0086] Comparative Example 3

[0087] The difference between this comparative example and Example 4 is that the high-barrier co-extruded films are nylon co-extruded films, EVOH co-extruded films, PVDC co-extruded films, and PVC co-extruded films. During the preparation process, each film was used to coat the inner layer of the polymer.

[0088] Comparative Example 4

[0089] The difference between this comparative example and Example 1 is that no barrier layer is provided.

[0090] Comparative Example 5

[0091] The difference between this comparative example and Example 1 is that no reinforcing layer is provided.

[0092] Comparative Example 6

[0093] The difference between this comparative example and Example 1 is that the pipe consists of, from the inside out, the following layers: inner polymer layer, adhesive resin layer, reinforcing layer, adhesive resin layer, barrier layer, adhesive resin layer, and outer polymer layer.

[0094] Test results

[0095] Hydrogen permeability tests were conducted on the hydrogen transport plastic composite pipes prepared in Examples 1-4 and Comparative Examples 1-6.

[0096] The specific test method is as follows: GB / T 1038-2000 "Test method for gas permeability of plastic films and sheets - differential pressure method" is used for testing.

[0097] Table 1 Hydrogen permeation resistance of high-performance composite pipes for hydrogen transportation

[0098] Example 1 <![CDATA[6.190×10 -16 ]]> Example 2 <![CDATA[6.384×10 -16 ]]> Example 3 <![CDATA[6.477×10 -16 ]]> Example 4 <![CDATA[6.897×10 -16 ]]> Comparative Example 1 <![CDATA[6.012×10 -16 ]]> Comparative Example 2 <![CDATA[5.980×10 -16 ]]> Comparative Example 3 <![CDATA[6.001×10 -16 ]]> Comparative Example 4 <![CDATA[2.158×10 -14 ]]> Comparative Example 5 <![CDATA[6.148×10 -16 ]]> Comparative Example 6 <![CDATA[3.416×10 -16 ]]>

[0099] As shown in Table 1, the pipes obtained in the examples have good resistance to hydrogen permeation. A comparison of Examples 1, 4, and Comparative Example 3 shows that the high-barrier co-extruded film with a multi-layered structure prepared using lamination technology has stronger resistance to hydrogen permeation. Comparing Example 1 with Comparative Example 6, the layered structure of the pipes in Example 1 shows better resistance to hydrogen permeation.

[0100] The adhesive properties of the adhesive resin layers in Examples 1-4 and Comparative Examples 1-3 were tested using a viscometer, and the results are as follows:

[0101] Table 2 Viscosity of Adhesive Resin Layer

[0102] Example 1 640 Example 2 650 Example 3 660 Example 4 680 Comparative Example 1 - Comparative Example 2 530 Comparative Example 3 650

[0103] As shown in Table 2, the adhesive resin layer obtained in the examples has a better viscosity. Compared with Comparative Example 1, the adhesive resin layer prepared in Example 1 has a better viscosity. Compared with Comparative Example 2, the adhesive resin obtained using the process of Example 1 has a better viscosity.

[0104] The compressive strength of the pipes prepared in Examples 1-4 and Comparative Examples 1-6 was tested, and the results are as follows:

[0105] Table 3. Pressure Resistance of High-Performance Composite Pipelines for Hydrogen Transportation

[0106]

[0107]

[0108] As shown in Table 3, the pipes prepared in the examples have good compressive strength. Comparing Example 1 with Comparative Examples 4-5, it is evident that the combined use of the reinforcing layer and the barrier layer can improve the compressive strength of the pipe. Comparing Example 4 with Comparative Example 3, it is evident that the preparation process of the high-barrier co-extruded film in Example 4 can improve the compressive strength of the pipe.

[0109] In summary, the high-performance composite pipe for hydrogen transportation provided by this invention can ensure strong resistance to hydrogen permeation during hydrogen transportation, while also greatly improving the pressure-bearing capacity of the pipe, which is beneficial for reducing the weight of the pipe and making it easier to install.

[0110] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-performance composite pipeline for hydrogen transportation, characterized in that: From the inside out, it includes a polymer inner layer, an adhesive resin layer, a barrier layer, an adhesive resin layer, a reinforcing layer, an adhesive resin layer, and a polymer outer layer. The adhesive resin layer comprises the following raw materials by weight: 5-15 parts urea-formaldehyde resin, 1-5 parts acrylate resin, 1-5 parts maleic anhydride graft copolymer, 1-2 parts polycarboxylic acid, 0.1-0.5 parts filler and 0.3-1.2 parts antioxidant; The method for preparing the adhesive resin layer includes the following steps: Blending urea-formaldehyde resin and acrylate resin yields substance A; Polycarboxylic acid is added to water and stirred for 5-10 minutes to obtain substance B. Add filler to substance B, heat for 10-30 minutes, then add substance A and maleic anhydride graft copolymer, homogenize for 20-40 minutes, then add antioxidant, stir and mix for 10-20 minutes, and extrude to obtain the product.

2. The high-performance composite pipeline for hydrogen transportation according to claim 1, characterized in that: Both the inner and outer polymer layers are made of polyethylene. The barrier layer includes a first high-barrier co-extruded film layer and a second high-barrier co-extruded film layer. The high-barrier co-extruded film is one or more of nylon co-extruded film, EVOH co-extruded film, PVDC co-extruded film, and PVC co-extruded film.

3. The high-performance composite pipeline for hydrogen transportation according to claim 1, characterized in that: The reinforcing layer is a braided fiber layer or a braided metal wire layer. The braided fiber layer is one or more of glass fiber reinforced nylon fiber, basalt fiber, polyphenylene sulfide fiber, ultra-high strength high modulus polyethylene fiber, poly(p-phenylene benzobisoxazole) fiber, polyimide fiber, and polytetrafluoroethylene fiber. The braided metal wire layer is galvanized steel wire.

4. The high-performance composite pipeline for hydrogen transportation according to claim 1, characterized in that: The filler is starch or kaolin, and the antioxidant is polyvinyl alcohol or polyvinyl acetate emulsion.

5. The method for preparing a high-performance composite pipeline for hydrogen transportation as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. A polymer inner layer is obtained by polyethylene extrusion, and then an adhesive resin layer is extruded and coated onto the polymer inner layer. S2. First, wrap the polymer inner layer treated in step S1 with the first high-barrier co-extruded film layer, and then wrap the first high-barrier co-extruded film layer with the second high-barrier co-extruded film layer. The first high-barrier co-extruded film layer and the second high-barrier co-extruded film layer are wrapped in opposite directions and the wrapping angle is 40-60°. The adhesive resin layer is extruded and coated on the second high-barrier co-extruded film layer. S3. The fibers are woven to obtain a woven fiber layer. An adhesion promoter is sprayed on the surface of the woven fiber layer. The woven fiber layer is cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. A curing agent is sprayed on the surface of the woven fiber layer and heated. Alternatively, metal wires can be braided to obtain a metal wire layer, and the metal wire layer can be cross-wound and wrapped around the second high-barrier co-extruded film layer after step S2. S4. The adhesive resin layer is extruded and coated onto the braided fiber layer or braided metal wire layer treated in step S3. Finally, the polymer outer layer is extruded and coated onto the braided fiber layer or braided metal wire layer to obtain the high-performance composite pipe.

6. The method for preparing a high-performance composite pipeline for hydrogen transportation according to claim 5, characterized in that: In steps S2 and S3, the number of cross-winding operations is ≥2 times.

7. The method for preparing a high-performance composite pipeline for hydrogen transportation according to claim 5, characterized in that: In step S4, after the polymer outer layer is extruded and wrapped with the braided fiber layer or braided metal wire layer, the composite pipe is fitted onto the mold and the mold is cold-pressed at 100-150MPa for 10-30 minutes.

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