High-barrier glass fiber reinforced plastic composite pipe and forming method thereof

Abstract

The invention discloses a high-barrier glass fiber reinforced plastic composite pipe and a forming method thereof, and belongs to the technical field of composite pipes. The high-barrier glass fiber reinforced plastic composite pipe is provided with a barrier layer between the lining pipe and the reinforcing layer; the polar material is added into the lining pipe, the aluminum foil is connected with the lining pipe containing the polar material through the pressure-sensitive adhesive, and the connectivity between the aluminum foil and the lining pipe is enhanced by means of the good bonding performance of the pressure-sensitive adhesive and the polar material; the oxidation layer with certain polarity is arranged on the outer surface of the aluminum foil, so that the aluminum foil and the thermosetting resin have good connectivity, the reinforcing layer contains the thermosetting resin, and the thermosetting resin can be used as a middle bonding layer to well connect the reinforcing layer and the blocking layer. On one hand, the binding force between the lining pipe and the reinforcing layer is provided, meanwhile, the stress concentration phenomenon caused by reinforcing ribs is effectively avoided, on the other hand, the gas barrier property of the pipe can be improved through the barrier layer, the application range of the pipe is widened, and the pipe can be applied to the gas transmission field including the high-pressure hydrogen transmission field.

Description

Technical Field

[0001] This invention belongs to the field of composite pipe technology, specifically relating to a high-barrier fiberglass composite pipe and its forming method. Background Technology

[0002] Fiberglass composite pipes consist of an inner thermoplastic plastic liner and an outer layer of fiber-reinforced thermosetting resin composite material. Combining the high strength of composite materials with the barrier properties of thermoplastics, they offer advantages such as corrosion resistance, good hydraulic properties, long service life, and light weight, and are primarily used in oil and gas field gathering and transportation. However, it is worth noting that because the liner and reinforcing layer are made of thermoplastic and thermosetting plastics respectively, and the commonly used polyolefin liner material has poor bonding strength, there is no bond between the two structural layers. This can easily lead to slippage between the two structural layers during transportation and installation. Furthermore, in harsh environments such as western oilfields, thermal expansion and contraction due to temperature differences can also cause delamination of the two structural layers.

[0003] To address this issue, the commonly used method is to attach reinforcing ribs to the outside of the inner liner tube, creating an uneven surface layer. A composite material layer is then wound around it, with the winding angle of the composite material layer opposite to the direction of the reinforcing ribs to prevent slippage between the inner liner tube and the reinforcing layer. However, due to the presence of the reinforcing ribs, when the tube is subjected to a certain internal pressure, there is a significant stress concentration phenomenon at the location of the reinforcing ribs on the glass fiber reinforced thermosetting resin composite material. This leads to uneven stress distribution within the tube, excessive localized stress, and a high risk of tube failure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-barrier fiberglass composite pipe and its preparation method, so as to solve the problem that stress concentration exists at the location of reinforcing ribs in the high-barrier fiberglass composite pipe in the prior art, resulting in uneven stress on the pipe body, excessive local stress, and easy pipe failure.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A high-barrier fiberglass composite pipe includes an inner liner pipe, the outer surface of which is wrapped with a barrier layer, and the outer surface of which is wrapped with a reinforcing layer. The inner liner contains a polar material, and the reinforcing layer is a glass fiber reinforced thermosetting resin composite material containing thermosetting resin. The barrier layer is a composite aluminum foil, which includes aluminum foil and pressure-sensitive adhesive, and the pressure-sensitive adhesive is disposed on the surface where the aluminum foil and the inner liner tube contact. The reinforcing layer is connected by a thermosetting resin and a barrier layer.

[0006] A further improvement of the present invention is that: Preferably, the inner liner is made of polypropylene.

[0007] Preferably, the inner liner tube is composed of 100 parts polypropylene, 2-10 parts polar material, 1-2 parts plasticizer and 0.1-0.5 parts antioxidant by weight.

[0008] Preferably, the polar material is a compound containing an epoxy group, a compound containing a hydroxyl group, or a compound containing a carbonyl group; the plasticizer is vinyl bis-stearamide or pentaerythritol; and the antioxidant is antioxidant 1010.

[0009] Preferably, the polar material also contains an initiator and an activator.

[0010] Preferably, the glass fiber reinforced thermosetting resin composite material further includes continuous glass fibers.

[0011] Preferably, in the glass fiber reinforced thermosetting resin composite material, the mass fraction of continuous glass fiber is 65%-75%, and the remainder is thermosetting resin.

[0012] Preferably, the thermosetting resin is any one of epoxy resin, vinyl resin, or unsaturated polyester.

[0013] A method for forming the above-mentioned high-barrier fiberglass composite pipe includes the following steps: S1, the mixed raw materials of the inner liner tube are extruded and granulated to obtain raw material particles, and the raw material particles are extruded to form the inner liner tube. S2, A composite aluminum foil is wound around the outer surface of the inner liner tube. The aluminum foil in the composite aluminum foil is bonded to the inner liner tube by pressure-sensitive adhesive to obtain a barrier layer. S3, a layer of thermosetting resin is coated on the outer surface of the barrier layer, and a glass fiber reinforced thermosetting resin composite material is wound around the thermosetting resin to obtain a reinforcing layer.

[0014] Preferably, in S2, when there is residual heat after the inner liner tube is extruded, a composite aluminum foil is wound around the outer surface of the inner liner tube; the composite aluminum foil is wound N times, where N is a natural number ≥1.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a high-barrier fiberglass composite pipe, which comprises a barrier layer between an inner liner and a reinforcing layer. A polar material is added to the inner liner, and aluminum foil is bonded to the polar material via pressure-sensitive adhesive. The good adhesion between the pressure-sensitive adhesive and the polar material enhances the connection between the aluminum foil and the inner liner. Simultaneously, the presence of a polar oxide layer on the outer surface of the aluminum foil provides good adhesion between the aluminum foil and the thermosetting resin. Since the reinforcing layer contains thermosetting resin, using it as an intermediate adhesive layer effectively connects the reinforcing layer and the barrier layer. This invention, on the one hand, improves the bonding strength between the inner liner and the fiberglass-reinforced thermosetting resin composite material, while effectively avoiding stress concentration caused by the reinforcing ribs. On the other hand, the use of aluminum foil enhances the gas barrier properties of the pipe, broadening its application range and enabling its use in gas transportation, including high-pressure hydrogen transportation. Attached Figure Description

[0016] Figure 1 This refers to fiberglass composite pipes in existing technologies; Figure 2 This is a schematic diagram of the reinforcing ribs; Figure 3 This is a schematic diagram of the high-barrier fiberglass composite pipe of the present invention; Among them, 1. Inner lining tube; 2. Barrier layer; 3. Reinforcing layer. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings: To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0018] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0019] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0021] As the background technology has problems, such as Figure 1 The diagram shows a typical composite pipe structure, consisting of inner and outer layers. Because there is no bonding force between the inner thermoplastic liner 1 and the outer glass fiber reinforced thermosetting composite reinforcement layer 3, slippage and delamination easily occur between the two structural layers during transportation and installation. To address this slippage issue, the pipe structure currently available on the market can refer to CN 207539391 U, which... Figure 1 Reinforcing ribs were added to the existing structure. Images of the inner lining tube and reinforcing ribs are shown below. Figure 2 As shown in the figure, the inner liner 1 and the reinforcing ribs (patterned parts) adhered to the inner layer are then wrapped with glass fiber composite material on the outer side, and finally cured to complete the pipe forming. Since the inner liner is typically made of thermoplastic polyolefin, while the composite material uses thermosetting resins such as epoxy resin and unsaturated polyester, the adhesion between the resins used in these two structural layers is very limited. Therefore, without the reinforcing ribs, slippage will occur between the two structural layers. However, the presence of the reinforcing ribs also causes stress concentration in the pipe under pressure, affecting its load-bearing capacity.

[0022] See Figure 3 To address the aforementioned problems, the first aspect of this invention provides a high-barrier fiberglass composite pipe structure, comprising an inner liner 1, a barrier layer 2, and a reinforcing layer 3 arranged from the inside out. The inner liner 1 is a thermoplastic pipe, primarily serving to isolate the medium, with a thickness of 2mm to 4mm. The barrier layer 2 is a composite aluminum foil. Since gas permeation is unavoidable in thermoplastics, a barrier layer is added to the gas-transporting composite pipe to reduce gas permeation. The reinforcing layer 3 is a glass fiber reinforced thermosetting resin composite material, providing the composite pipe with its main pressure-bearing capacity, with a thickness of 2mm to 20mm depending on the pressure-bearing capacity. The composite aluminum foil has a two-layer structure: one layer of aluminum foil and one layer of pressure-sensitive adhesive. The reinforcing layer 3 is connected to the barrier layer 2 via thermosetting resin.

[0023] The aforementioned high-barrier fiberglass composite pipe has a barrier layer 2 between the inner liner 1 and the reinforcing layer 3. Polar materials are added to the inner liner 1, and the aluminum foil is connected to the polar materials through pressure-sensitive adhesive. The good adhesion between the pressure-sensitive adhesive and the polar materials ensures a bond between the inner liner 1 and the barrier layer 2, enhancing the connection between the aluminum foil and the inner liner 1. At the same time, the outer surface of the aluminum foil has a certain polarity oxide layer, which provides good adhesion between the aluminum foil and the thermosetting resin. The reinforcing layer 3 contains thermosetting resin, which acts as an intermediate adhesive layer to effectively connect the reinforcing layer 3 and the barrier layer 2.

[0024] In some embodiments of the present invention, the inner liner is made of polypropylene. When polypropylene is used as the material for the inner liner 1, it exhibits excellent corrosion resistance, resisting the erosion of various chemicals (such as acids, alkalis, and salts). This characteristic allows the polypropylene inner liner in the fiberglass composite pipe to effectively prevent corrosion of the pipe's inner wall by the medium, thereby extending the pipe's service life. The polypropylene inner liner can withstand most corrosive environments, such as salt water, HCl, and concentrated alkalis, demonstrating good corrosion resistance. Furthermore, polypropylene is a non-toxic material, making it ideal for applications requiring guaranteed medium purity. In the fiberglass composite pipe, the polypropylene inner liner ensures that the transported medium is not contaminated, which is particularly important for industries such as food and pharmaceuticals that require high-purity media. Polypropylene is lightweight yet relatively strong. This allows the fiberglass composite pipe to maintain high strength and rigidity while reducing overall weight, facilitating transportation and installation. On the other hand, using polypropylene as the inner liner provides good airtightness, effectively preventing gas leakage. In fiberglass reinforced plastic (FRP) composite pipes, the polypropylene liner ensures that the medium is not lost due to leakage during transportation, and also helps prevent external gases from entering the pipe and affecting the quality and safety of the medium. Furthermore, polypropylene has a wide operating temperature range under normal conditions (-45℃ to 100℃), meeting the needs of most applications. This characteristic allows the polypropylene liner in FRP composite pipes to adapt to different operating temperature environments, ensuring stable pipeline operation.

[0025] The components of the inner liner tube 1, by mass parts, are: 100 parts of polypropylene 2-10 parts of polar material 1-2 parts plasticizer Antioxidant 0.1-0.5 parts Preferably, the melt index of the polypropylene is 3-5 g / 10 min (230℃, 2.16 kg). Controlling the melt index of polypropylene can control the flowability of polypropylene during the extrusion manufacturing process.

[0026] In some embodiments of the present invention, the polar material is a compound containing an epoxy group, a compound containing a hydroxyl group, or a compound containing a carbonyl group; specifically, polar materials containing epoxy groups include glycidyl methacrylate (GMA), polar materials containing hydroxyl groups include hydroxyethyl methacrylate and undecenoic acid, and polar materials containing carbonyl groups include maleic anhydride and vinyl acetate (VAc). The polar materials selected in this step generally have the following characteristics: (1) containing reactive groups such as double bonds; (2) containing polar groups such as carboxyl, hydroxyl, and epoxy groups; (3) good thermal stability and not decomposing within the processing temperature range; (4) boiling point higher than the melt grafting reaction temperature. Generally, the greater the polarity, the stronger the adhesion.

[0027] In some embodiments of the present invention, an initiator and an activator are also added to the polar material to promote compatibility between the polar material and the resin matrix.

[0028] In a preferred embodiment, the inner liner 1 contains maleic anhydride, dicumyl peroxide, and tetramethylthiuram disulfide; the weight ratio of the three polar materials is (3-10):(0.2-0.5):(0.2-0.5). Dicumyl peroxide is used as an initiator, and tetramethylthiuram disulfide is used as an activator. When these three are added to polypropylene, maleic anhydride-grafted polypropylene (PP-g-MAH) can be generated in a short time during melting and heating. This grafted polymer can increase the polarity of PP while ensuring the compatibility between the polar material and the resin (one end of the graft is a polar material, and the other end is polypropylene; the polypropylene here has good compatibility with the matrix polypropylene).

[0029] Preferably, the plasticizer is either vinyl bis-stearamide or pentaerythritol. Vinyl bis-stearamide, as a plasticizer, can improve the fluidity of the plastic melt, making the plastic easier to demold during processing, thereby improving production efficiency. At the same time, vinyl bis-stearamide can reduce the melt viscosity of the system and improve the surface smoothness and gloss of the inner liner tube 1. Pentaerythritol can improve the flexibility and impact resistance of the entire system, and at the same time play a plasticizing role in processing, improving the processing performance of the entire system and making the plastic easier to mold.

[0030] Preferably, the antioxidant is antioxidant 1010, which is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0031] In some embodiments of the present invention, the glass fiber reinforced thermosetting resin composite material is specifically composed of continuous glass fiber and thermosetting resin, wherein the mass fraction of glass fiber is 65%-75%, and the remainder is thermosetting resin; the thermosetting resin can be one of epoxy resin, vinyl ester resin or unsaturated polyester.

[0032] As a preferred option, the epoxy resin formulation, by parts by weight, is as follows: Resin Formulation 1: Epoxy Resin E5445-55 Methyltetrahydrophthalic anhydride 35-45 Quaternary ammonium salt 0.5-2 As a preferred option, the unsaturated polyester formulation, by weight parts, is as follows: Unsaturated polyester resin 100 Cyclohexanone dibutyl peroxide 1-5 Cobalt naphthenate 1-5 Dibutyl phthalate 5-10 As a preferred embodiment, the vinyl resin formulation, by parts by weight, is as follows: Vinyl Resin 100 Methyl ethyl ketone peroxide 2-5 Cobalt naphthenate 1-5.

[0033] In some embodiments of the present invention, the thickness of the inner liner 1 is ≥2mm and the thickness of the reinforcing layer 3 is ≥2mm. By limiting the thickness, the strength of the entire high-barrier fiberglass composite pipe is guaranteed.

[0034] A second aspect of the present invention discloses a method for preparing a high-barrier fiberglass composite pipe, the method comprising the following steps: S1, the mixed raw materials of the inner liner tube 1 are extruded and granulated to obtain raw material particles, the raw material particles are dried, and the dried raw material particles are extruded to form the inner liner tube 1. S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, a layer of thermosetting resin is coated on the outer surface of aluminum foil, and a glass fiber reinforced thermosetting resin composite material is wound around the thermosetting resin to obtain the reinforcing layer 3.

[0035] In some embodiments of the present invention, the processing of the inner liner tube in S1 includes the following steps: (1) Dry polypropylene at 100℃ for 3-5 hours to obtain dried acrylic acid; (2) Mix the dried polypropylene, polar material, plasticizer and antioxidant evenly according to the set mass fraction; (3) The uniformly mixed raw materials are extruded and granulated through an extruder at an extrusion temperature of 180℃-220℃; During this process, the temperatures of each heating zone of the extruder are: 180℃, 190℃, 200℃, 210℃ and 220℃; (4) Dry the granules prepared in step 3 at 100°C for 3-5 hours and use an extruder to form the inner liner tube 1.

[0036] During this process, the temperatures of each heating zone of the extruder are: 210℃, 220℃, 230℃, 240℃ and 250℃.

[0037] In some embodiments of the present invention, in S2, a composite aluminum foil is wound around the outside of the inner liner tube 1. Since the inner liner tube has added polar material, the adhesion between the inner liner tube 1 and the pressure-sensitive adhesive is improved, and the aluminum foil layer can be directly adhered to the outside of the inner liner tube 1.

[0038] Preferably, the aluminum foil has a width of 10mm-50mm, a thickness of 0.05mm-0.1mm, and a winding angle of 45°-60°. The aluminum foil is wound N times, where N is a natural number ≥1, to ensure that all surfaces of the inner liner tube are covered by the aluminum foil.

[0039] More preferably, N is 1, which allows the aluminum foil to completely wrap the inner liner tube 1 while reducing costs.

[0040] In this step, as a preferred option, S2 is performed when there is still residual heat after extrusion into the inner liner tube 1, so that the pressure-sensitive adhesive can better connect with the inner liner tube 1 with the help of the residual heat (50℃~90℃).

[0041] In some embodiments of the present invention, in step S3, a layer of thermosetting resin is first coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material. After winding, curing is performed at a temperature of 50°C-70°C for 0.5h-1h. This temperature range will not affect the bonding ability of the pressure-sensitive adhesive.

[0042] This invention discloses a high-barrier fiberglass composite pipe and its molding method. This method eliminates the use of reinforcing ribs found in traditional fiberglass composite pipes, thus avoiding stress concentration between the inner liner and the reinforcing layer, and simultaneously improving the pipe's barrier properties. This invention introduces a barrier layer between the inner liner and the reinforcing layer that can bond to both. This barrier layer provides barrier properties, broadening the application range of this type of pipe.

[0043] The following description, in conjunction with specific embodiments, provides further details.

[0044] Example 1 S1. Polypropylene is dried at 100°C for 4 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 5 parts of polar material (maleic anhydride), 1 part of plasticizer, and 0.5 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0045] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 40mm wide, 0.1mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 60°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 70%, and the mass fraction of thermosetting resin is 30%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin, and by mass fraction, the epoxy resin formulation consists of 50 parts epoxy resin E54, 40 parts methyltetrahydrophthalic anhydride, and 1 part quaternary ammonium salt.

[0046] Example 2 S1. Polypropylene is dried at 100°C for 4 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 5 parts of polar material (glycidyl methacrylate), 1 part of plasticizer, and 0.5 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0047] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 40mm wide, 0.1mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 60°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 70%, and the mass fraction of thermosetting resin is 30%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin, and by mass fraction, the epoxy resin formulation consists of 50 parts epoxy resin E54, 40 parts methyltetrahydrophthalic anhydride, and 1 part quaternary ammonium salt.

[0048] Example 3 S1. Polypropylene is dried at 100°C for 4 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 5 parts of polar material, 1 part of plasticizer, and 0.5 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0049] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 5:0.3:0.3, and the plasticizer is vinyl bis-stearamide.

[0050] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 40mm wide, 0.1mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 60°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 70%, and the mass fraction of thermosetting resin is 30%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin, and by mass fraction, the epoxy resin formulation consists of 50 parts epoxy resin E54, 40 parts methyltetrahydrophthalic anhydride, and 1 part quaternary ammonium salt.

[0051] Example 4 S1. Polypropylene is dried at 100°C for 3 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 2 parts of polar material, 1.5 parts of plasticizer, and 0.2 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 3 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0052] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 4:0.2:0.2, and the plasticizer is pentaerythritol.

[0053] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 20mm wide, 0.05mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 60°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 65%, and the mass fraction of thermosetting resin is 35%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin, and by mass fraction, the epoxy resin formulation consists of 45 parts epoxy resin E54, 45 parts methyltetrahydrophthalic anhydride, and 0.5 parts quaternary ammonium salt.

[0054] Example 5 S1. Polypropylene is dried at 100°C for 5 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 10 parts of polar material, 2 parts of plasticizer, and 0.1 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 5 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0055] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 8:0.4:0.4, and the plasticizer is vinyl bis-stearamide.

[0056] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 30mm wide, 0.08mm thick, and wrapped at a 50° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 70°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 75%, and the mass fraction of thermosetting resin is 25%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin, and by mass fraction, the epoxy resin formulation consists of 55 parts epoxy resin E54, 35 parts methyltetrahydrophthalic anhydride, and 2 parts quaternary ammonium salt.

[0057] Example 6 S1. Polypropylene is dried at 100°C for 4 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 7 parts of polar material, 1 part of plasticizer, and 0.3 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0058] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 6:0.5:0.5, and the plasticizer is vinyl bis-stearamide.

[0059] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 50mm wide, 0.1mm thick, and wrapped at a 60° angle; the aluminum foil is wrapped once. S3 involves first coating the outer surface of the aluminum foil with a layer of thermosetting resin, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 55°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 68%, and the mass fraction of thermosetting resin is 32%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an unsaturated polyester. By mass fraction, the unsaturated polyester formulation consists of 100 parts unsaturated polyester resin, 3 parts dibutyl cyclohexanone peroxide, 3 parts cobalt naphthenate, and 8 parts dibutyl phthalate.

[0060] Example 7 S1. Polypropylene is dried at 100°C for 3 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 8 parts of polar material, 2 parts of plasticizer, and 0.4 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 3 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0061] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 7:0.3:0.3, and the plasticizer is vinyl bis-stearamide.

[0062] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 10mm wide, 0.05mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3. A layer of thermosetting resin is first coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material, and then drying at 65°C. In the glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 75%, and the mass fraction of thermosetting resin is 30%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an unsaturated polyester. By mass fraction, the unsaturated polyester formulation consists of 100 parts unsaturated polyester resin, 1 part dibutyl cyclohexanone peroxide, 1 part cobalt naphthenate, and 5 parts dibutyl phthalate.

[0063] Example 8 S1. Polypropylene is dried at 100°C for 5 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 6 parts of polar material, 1 part of plasticizer, and 0.5 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 5 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0064] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 3:0.2:0.2, and the plasticizer is vinyl bis-stearamide.

[0065] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 20mm wide, 0.08mm thick, and wrapped at a 50° angle; the aluminum foil is wrapped once. S3 involves first coating a layer of thermosetting resin onto the outer surface of the aluminum foil, followed by winding a glass fiber reinforced thermosetting resin composite material, and then drying it at 60°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 70%, and the mass fraction of thermosetting resin is 30%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an unsaturated polyester. By mass fraction, the unsaturated polyester formulation consists of 100 parts unsaturated polyester resin, 5 parts dibutyl cyclohexanone peroxide, 5 parts cobalt naphthenate, and 10 parts dibutyl phthalate.

[0066] Example 9 S1. Polypropylene is dried at 100°C for 3 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 9 parts of polar material, 2 parts of plasticizer, and 0.2 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0067] The polar material contains maleic anhydride, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 9:0.4:0.4, and the plasticizer is vinyl bis-stearamide.

[0068] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 30mm wide, 0.1mm thick, and wrapped at a 60° angle; the aluminum foil is wrapped once. S3. A layer of thermosetting resin is first coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material, which is then dried at 50°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 65%, and the mass fraction of thermosetting resin is 35%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is a vinyl ester resin, and by mass fraction, the vinyl ester resin formulation consists of 100 parts vinyl ester resin, 3 parts methyl ethyl ketone peroxide, and 3 parts cobalt naphthenate.

[0069] Example 10 S1. Polypropylene is dried at 100°C for 3 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 3 parts of polar material, 1 part of plasticizer, and 0.1 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 3 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0070] The polar material contains glycidyl methacrylate, diisopropylbenzene peroxide, and tetramethylthiuram disulfide in a mass ratio of 10:0.5:0.5, and the plasticizer is vinyl bis-stearamide.

[0071] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 50mm wide, 0.05mm thick, and wrapped at a 45° angle; the aluminum foil is wrapped once. S3. First, a layer of thermosetting resin is coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material. After winding, it is dried at 70°C. In the glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 75%, and the mass fraction of thermosetting resin is 25%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is an epoxy resin. By mass fraction, the formulation of vinyl ester resin is 100 parts vinyl ester resin, 2 parts methyl ethyl ketone peroxide, and 1 part cobalt naphthenate.

[0072] Example 11 S1. Polypropylene is dried at 100°C for 5 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 4 parts of polar material, 2 parts of plasticizer, and 0.3 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 5 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0073] The polar material contains hydroxyethyl methacrylate, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 5:0.3:0.3, and the plasticizer is vinyl bis-stearamide.

[0074] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 10mm wide, 0.08mm thick, and wrapped at a 50° angle; the aluminum foil is wrapped once. S3. A layer of thermosetting resin is first coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material, which is then dried at 55°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 68%, and the mass fraction of thermosetting resin is 32%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is a vinyl ester resin, and by mass fraction, the vinyl ester resin formulation consists of 100 parts vinyl ester resin, 5 parts methyl ethyl ketone peroxide, and 5 parts cobalt naphthenate.

[0075] Example 12 S1. Polypropylene is dried at 100°C for 4 hours to obtain dried acrylic acid. 100 parts of the dried polypropylene, 5 parts of polar material, 2 parts of plasticizer, and 0.4 parts of antioxidant are mixed evenly according to the set mass fractions. The evenly mixed raw materials are extruded and granulated through an extruder. During this process, the temperatures of each heating zone of the extruder are 180°C, 190°C, 200°C, 210°C, and 220°C. The granules are dried at 100°C for 4 hours and then extruded to form the inner liner tube 1. During this process, the temperatures of each heating zone of the extruder are 210°C, 220°C, 230°C, 240°C, and 250°C.

[0076] The polar material contains vinyl acetate, dicumyl peroxide and tetramethylthiuram disulfide in a mass ratio of 6:0.2:0.2, and the plasticizer is vinyl bis-stearamide.

[0077] S2, aluminum foil is wound around the outer surface of the inner liner tube 1, and pressure-sensitive adhesive is provided on the contact surface between the aluminum foil and the inner liner tube 1 to obtain the barrier layer 2; S3, Wrap composite aluminum foil around the outside of the inner liner tube. The aluminum foil is 20mm wide, 0.1mm thick, and wrapped at a 60° angle. The aluminum foil is wrapped once. S3. A layer of thermosetting resin is first coated on the outer surface of the aluminum foil, followed by winding of a glass fiber reinforced thermosetting resin composite material, which is then dried at 65°C. In this glass fiber reinforced thermosetting resin composite material, the mass fraction of glass fiber is 72%, and the mass fraction of thermosetting resin is 28%. The thermosetting resin used to coat the outer surface of the aluminum foil in this process is a vinyl ester resin, and by mass fraction, the vinyl ester resin formulation consists of 100 parts vinyl ester resin, 5 parts methyl ethyl ketone peroxide, and 5 parts cobalt naphthenate.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-barrier fiberglass composite pipe, characterized in that, It includes an inner liner tube (1), the outer surface of which is wrapped with a barrier layer (2), and the outer surface of the barrier layer (2) is wrapped with a reinforcing layer (3). The inner liner tube (1) contains a polar material, and the reinforcing layer (3) is a glass fiber reinforced thermosetting resin composite material containing thermosetting resin. The barrier layer (2) is a composite aluminum foil, which includes aluminum foil and pressure-sensitive adhesive. The pressure-sensitive adhesive is disposed on the surface where the aluminum foil and the inner liner tube (1) are in contact. The reinforcing layer (3) is connected by a thermosetting resin and a barrier layer (2).

2. The high-barrier fiberglass composite pipe according to claim 1, characterized in that, The inner liner tube (1) is made of polypropylene.

3. The high-barrier fiberglass composite pipe according to claim 2, characterized in that, The inner lining tube (1) is composed of 100 parts polypropylene, 2-10 parts polar material, 1-2 parts plasticizer and 0.1-0.5 parts antioxidant by mass.

4. The high-barrier fiberglass composite pipe according to claim 3, characterized in that, The polar material is a compound containing an epoxy group, a compound containing a hydroxyl group, or a compound containing a carbonyl group; the plasticizer is vinyl bis-stearamide or pentaerythritol; and the antioxidant is antioxidant 1010.

5. A high-barrier fiberglass composite pipe according to claim 4, characterized in that, The polar material also contains initiators and activators.

6. The high-barrier fiberglass composite pipe according to claim 1, characterized in that, The glass fiber reinforced thermosetting resin composite material also includes continuous glass fibers.

7. A high-barrier fiberglass composite pipe according to claim 6, characterized in that, In the glass fiber reinforced thermosetting resin composite material, the mass fraction of continuous glass fiber is 65%-75%, and the remainder is thermosetting resin.

8. A high-barrier fiberglass composite pipe according to claim 1, characterized in that, The thermosetting resin is any one of epoxy resin, vinyl resin, or unsaturated polyester.

9. A method for forming the high-barrier fiberglass composite pipe according to claim 1, characterized in that, Includes the following steps: S1, the mixed raw materials of the inner liner tube (1) are extruded and granulated to obtain raw material particles, and the raw material particles are extruded to form the inner liner tube (1). S2, a composite aluminum foil is wrapped around the outer surface of the inner liner tube (1), and the aluminum foil in the composite aluminum foil is bonded to the inner liner tube (1) by pressure-sensitive adhesive to obtain a barrier layer (2). S3, a layer of thermosetting resin is coated on the outer surface of the barrier layer (2), and a glass fiber reinforced thermosetting resin composite material is wound around the thermosetting resin to obtain the reinforcing layer (3).

10. The molding method of a high-barrier fiberglass composite pipe according to claim 9, characterized in that, In S2, when the inner liner tube (1) has residual heat after extrusion, a composite aluminum foil is wrapped around the outer surface of the inner liner tube (1); the composite aluminum foil is wrapped N times, where N is a natural number ≥1.

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