Ozone-resistant fatigue-resistant high-pressure air pipe

Abstract

The invention relates to the technical field of high-pressure air pipe preparation, and particularly discloses an anti-ozone fatigue-resistant high-pressure air pipe which is prepared through the following steps that S1, an airtight layer is prepared; s2, preparing an enhancement layer; s3, preparing a high-pressure air pipe; starting from two aspects, firstly, functional filler is added, an outer shell of the functional filler is octenyl succinic anhydride modified porous core-shell particles, an inner core of the functional filler is nano zinc oxide, secondly, a reinforcing component is added, the reinforcing component contains a modified graphene oxide structure, a benzene ring and unsaturated double bonds, and through the combined action of all the structures, the functional filler can be used for reinforcing the surface of the composite material. The tensile strength and the high-temperature resistance of the high-pressure air pipe reinforcing layer are improved, and meanwhile, the impermeability and the oil resistance of the protective layer are improved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure air tube manufacturing technology, and more specifically, to an ozone-resistant and fatigue-resistant high-pressure air tube. Background Technology

[0002] High-pressure air hoses are widely used in many fields such as industry, energy, medical, transportation and aerospace due to their excellent ozone aging resistance, fatigue resistance and high pressure bearing capacity.

[0003] High-pressure air hoses typically use POE-based composite elastomers, which have good resistance to environmental aging and high elasticity, as the reinforcing layer, and methyl vinyl silicone rubber, which has good resistance to compression set, as the protective layer. However, POE-based composite elastomers have poor tensile strength and high-temperature resistance. In existing technologies, nanofillers are often added to improve their tensile strength and high-temperature resistance. However, there is a large difference in polarity between POE-based composite elastomers and nanofillers, and they cannot participate in cross-linking and curing reactions, making them prone to migration and precipitation. This results in poor tensile strength and high-temperature resistance of high-pressure air hoses. Furthermore, existing methyl vinyl silicone rubber has high gas permeability and poor oil resistance. It is prone to swelling when in contact with non-polar mineral oils such as fuel oil and hydraulic oil, leading to a serious decline in performance.

[0004] Based on the above statements, the present invention provides an ozone-resistant and fatigue-resistant high-pressure air pipe. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides an ozone-resistant and fatigue-resistant high-pressure air pipe.

[0006] An ozone-resistant and fatigue-resistant high-pressure air tube is prepared by the following steps: Step S1: Preparation of the airtight layer: The airtight layer comprises the following raw materials in parts by weight: 100-120 parts high-density polyethylene, 12-16 parts polyolefin elastomer, 3-8 parts maleic anhydride grafted polyethylene, 0.1-0.3 parts processing aids and 0.1-0.5 parts antioxidants; the above raw materials are mixed evenly and then extruded through a twin-screw extruder to obtain the airtight layer; Step S2, Preparation of reinforcing layer: Functionalized polyolefin elastomer is extruded to initially form a tubular shape with a thickness of 2.8-3mm that matches the airtight layer. It is then stretched to tightly cover the airtight layer to form a reinforcing layer. Step S3: Preparation of high-pressure air tube: Weather-resistant silicone rubber is directly extruded onto the outside of the reinforcing layer to form a tightly structured protective layer, resulting in an ozone-resistant and fatigue-resistant high-pressure air tube.

[0007] Further, in step S2, the functionalized polyolefin elastomer is prepared by uniformly mixing 80-100 parts of polyolefin elastomer, 6-12 parts of ternary copolymer rubber, 3.4-4.2 parts of maleic anhydride grafted polyethylene, 2.4-2.8 parts of functional filler, 0.8-1.6 parts of peroxide crosslinking agent and 0.03-0.05 parts of functional additives by weight, and then extruding it through a twin-screw extruder.

[0008] Furthermore, in step S1, the processing aid is FX5911 or FX5924.

[0009] Further, in step S1, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.2-0.4.

[0010] Furthermore, in step S1, the extrusion process of the twin-screw extruder is as follows: Zone 1 170-180℃, Zone 2 180-185℃, Zone 3 185-190℃, Zone 4 190-195℃, Zone 5 195-200℃, die head temperature 200℃; screw speed 200rpm.

[0011] Further, in step S2, the peroxide crosslinking agent is tert-butyl peroxycarbonate-2-ethylhexyl ester or tert-amyl peroxycarbonate-2-ethylhexyl ester.

[0012] Furthermore, in step S2, the functional additive is stearic acid.

[0013] Furthermore, in step S2, the extrusion process of the twin-screw extruder is as follows: Zone 1 150-160℃, Zone 2 165-175℃, Zone 3 175-185℃, Zone 4 180-190℃, Zone 5 175-185℃, die head temperature 175℃; screw speed 260-280rpm.

[0014] Furthermore, the functional filler is prepared by the following steps: Step A1: Dissolve tetraethyl orthosilicate in an ethanol aqueous solution, add nano zinc oxide, ultrasonically disperse evenly, adjust pH to 8-9, add pore-forming agent and emulsifier, emulsify for 3-5 minutes, centrifuge, wash, and dry to obtain porous core-shell particles. In the above reaction process, tetraethyl orthosilicate is used as raw material and nano zinc oxide is used as core. Through the sol-gel method, porous core-shell particles with porous silica outer layer and nano zinc oxide core are obtained. Step A2: Ultrasonically mix core-shell particles, deionized water, anhydrous ethanol, and KH-550 until homogeneous. Heat to 48-56℃ and continue stirring for 5.4-6 hours. Centrifuge, wash, and dry to obtain aminated core-shell particles. Add the aminated core-shell particles and octenyl succinic anhydride to anhydrous DMF and stir until homogeneous. Add triethylamine dropwise. After the addition is complete, heat to 64-68℃ and stir for 2.4-2.8 hours. Centrifuge to precipitate, wash, and dry to obtain the functional filler. First, treat the core-shell particles with KH-550 to obtain aminated core-shell particles. The carboxyl groups of octenyl succinic anhydride can undergo ring-opening esterification with the amino groups on the surface of the aminated core-shell particles. Grafting octenyl succinic anhydride onto the surface of the core-shell particles reduces the aggregation of the core-shell particles, improves the dispersion performance of the core-shell particles, and enhances the compatibility of the core-shell particles. At the same time, the remaining unsaturated double bonds on the functional filler can also participate in subsequent reaction processes.

[0015] Furthermore, in step A1, the mass fraction of the ethanol aqueous solution is 32-36%.

[0016] Further, in step A1, the mass ratio of tetraethyl orthosilicate, aqueous ethanol solution, nano zinc oxide, pore-forming agent and emulsifier is 6-12:26-30:1-2:0.2-0.4:0.016-0.02.

[0017] Furthermore, in step A1, the pore-forming agent is polyethylene glycol octylphenyl ether or hexadecyltrimethylammonium bromide.

[0018] Further, in step A1, the emulsifier is at least one of Tween-20, Tween-40, and Tween-60.

[0019] Further, in step A2, the mass ratio of core-shell particles, deionized water, anhydrous ethanol, and KH-550 is 2.6-3:10-16:24-30:0.16-0.3, and the mass ratio of aminated core-shell particles, octenyl succinic anhydride, anhydrous DMF, and triethylamine is 2.2:1.4-1.8:40-50:0.2-0.4.

[0020] Further, in step S3, the weather-resistant silicone rubber comprises the following raw materials in parts by weight: 60-64 parts methyl vinyl silicone rubber raw rubber, 34-36 parts thermoplastic polyurethane elastomer, 6-8 parts reinforcing component, 15-16 parts trioctyl phosphate, 4.2-4.8 parts dibutyl malonate, 1.6-2.2 parts L-cyclohexylglycine, 2.8-3.4 parts diethylene glycol butyl ether acetate, 0.6-0.8 parts accelerator and 3.6-4 parts vulcanizing agent.

[0021] Weather-resistant silicone rubber is prepared by the following steps: Step B1: According to the weight parts, add methyl vinyl silicone rubber raw rubber, thermoplastic polyurethane elastomer, reinforcing component, trioctyl phosphate, dibutyl malonate, L-cyclohexylglycine and diethylene glycol butyl ether acetate to a kneader, mix at 80-100℃ for 2.4-2.6h, maintain the temperature, vacuum mix for 3.7-4.1h, cool to room temperature to obtain a vulcanizing agent-free compound; then pass the vulcanizing agent-free compound, accelerator and vulcanizing agent through a thin pass to obtain a vulcanizing agent-containing compound; Step B2: The compound containing vulcanizing agent prepared in step B1 is extruded into shape by a twin-screw extruder and subjected to a single vulcanization treatment to obtain a single-vulcanized weather-resistant silicone rubber. Step B3: Perform a second vulcanization treatment on the primary vulcanized weather-resistant silicone rubber to obtain weather-resistant silicone rubber.

[0022] Furthermore, in step B1, the accelerator is accelerator TMTD.

[0023] Further, in step B1, the vulcanizing agent is 2,5-dimethyl-2,5-di-tert-butylperoxyhexane or 2,4-dichlorobenzoyl peroxide.

[0024] Furthermore, in step B1, the vacuum degree of the vacuum mixing is -0.1 MPa.

[0025] Furthermore, in step B2, the extrusion process of the twin-screw extruder is as follows: Zone 1 185-195℃, Zone 2 195-205℃, Zone 3 205-215℃, Zone 4 185-195℃, Zone 5 180-190℃, die head temperature 180℃; screw speed 300-400rpm.

[0026] Furthermore, in step B2, the specific process parameters for the primary vulcanization treatment are: vulcanization pressure of 8-15 MPa, vulcanization temperature of 160-180℃, and vulcanization time of 12-18 min.

[0027] Furthermore, in step B3, the specific process parameters for the secondary vulcanization treatment are: vulcanization pressure of 0.1 MPa, vulcanization temperature of 160-240℃, and vulcanization time of 4.2-4.6 h.

[0028] Furthermore, the reinforcing component is prepared by the following steps: Step C1: The graphene oxide solution was ultrasonically dispersed in Tris-HCl buffer solution with pH 8-9, then dopamine was added, the mixture was stirred for 3-5 hours, filtered, washed, and dried to obtain modified graphene oxide. Step C2: Add modified graphene oxide to anhydrous DMF, stir evenly, and dropwise add a mixture of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF. After the addition is complete, heat to 78-82℃, stir and react for 3.2-3.6 hours, centrifuge to precipitate, wash, and dry to obtain the reinforcing component. In the above reaction process, the amino groups of modified graphene oxide can undergo amidation reaction with the carboxyl groups on trans-cinnamic acid to obtain the reinforcing component.

[0029] Further, in step C1, the mass ratio of graphene oxide solution, Tris-HCl buffer and dopamine is 16-20:30-40:2-4, and the graphene oxide solution is composed of graphene oxide, anhydrous ethanol and deionized water in a mass ratio of 1:40-60:40-60.

[0030] Further, in step C2, the mass ratio of modified graphene oxide, anhydrous DMF, and mixture a is 1:40-50:20-30, and in mixture a, the mass ratio of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF is 0.40-0.48:0.20-0.24:0.36-0.4:10.

[0031] Compared with the prior art, the present invention has the following beneficial effects: To improve the tensile strength and high-temperature resistance of the high-pressure air pipe reinforcement layer, while also enhancing the impermeability and oil resistance of the protective layer, this invention addresses the issue from two aspects. First, it incorporates a functional filler. The outer shell of this filler is composed of porous core-shell particles modified with octenyl succinic anhydride, while the core is nano-zinc oxide. This nano-zinc oxide not only synergizes with the silica structure of the outer shell as a reinforcing and thermally stabilizing component, enhancing the tensile strength and high-temperature resistance of the high-pressure air pipe reinforcement layer, but it also undergoes an ionization reaction with maleic anhydride-grafted polyethylene in the raw materials, forming reversible dynamic ionic bonds. This further improves the tensile strength and high-temperature resistance of the high-pressure air pipe reinforcement layer. Simultaneously, the octenyl succinic anhydride grafted onto the outer shell can entangle and intertwine with the flexible structures in the polyolefin elastomer, ternary copolymer rubber, and maleic anhydride-grafted polyethylene, forming an intertwined structure. The first aspect is the use of an interpenetrating molecular network structure, which further improves the tensile strength of the high-pressure air tube reinforcement layer. Secondly, a reinforcing component is added, containing a modified graphene oxide structure, benzene rings, and unsaturated double bonds. The modified graphene oxide structure, through polydopamine modification and coating, effectively isolates and prevents the face-to-face aggregation of graphene oxide sheets, improving the dispersibility of graphene oxide while enhancing the impermeability and oil resistance of the protective layer. The benzene rings can be directly adsorbed onto the graphene oxide surface through π-π interactions, restricting the free movement of trans-cinnamic acid molecular chains when heated or in contact with solvents, further improving the impermeability and oil resistance of the protective layer. The unsaturated double bonds can participate as reactive groups in the vulcanization process of weather-resistant silicone rubber, improving the compatibility of the reinforcing component while further enhancing the impermeability and oil resistance of the protective layer. Detailed Implementation

[0032] To make the embodiments of the present invention easier to understand, the present invention will be described in detail below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not limited to the application scope of the present invention.

[0033] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0034] Sodium carbonate-sodium bicarbonate buffer solution was purchased from Shanghai Yuanye Biotechnology Co., Ltd., pH 9.79; high-density polyethylene was purchased from Ningbo Huangxuan Plastics Technology Co., Ltd., grade M80063S; ternary copolymer rubber was purchased from Shanghai Liangrun International Trade Co., Ltd., grade IP 4570; maleic anhydride grafted polyethylene was purchased from Dongguan Caihua Plastics Technology Co., Ltd., grade LLDPE GT6; polyolefin elastomer was purchased from Langfang Haozheng Plastics Technology Co., Ltd., grade Weidamei 6202, hardness 64A; nano zinc oxide was purchased from Qinghe County Chaotai Metal Materials Co., Ltd., CAS No. 80097, particle size 20nm; polyethylene glycol octylphenyl ether was purchased from Jiangsu Haian Petrochemical Plant, CAS No. 9002-93-1; methyl vinyl silicone rubber raw rubber was purchased from Guangzhou Rongda Chemical Co., Ltd., item number RBG-0612; graphene oxide was purchased from Henan Wanying Refractory Materials Technology Co., Ltd. The company's specifications are 500 mesh, expansion degree is 0.01, volatility is 0.01; nano titanium dioxide was purchased from Qinghe County Chaotai Metal Materials Co., Ltd., CAS number 1344-2-2, particle size is 20nm; tetraethyl orthosilicate was purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd., CAS number 562-90-3; thermoplastic polyurethane elastomer was purchased from Shanghai Aosui Engineering Plastics Co., Ltd., model is UV resistant grade 1298AU, density is 0.93-0.96g / cm³, elastic modulus is 436Mpa.

[0035] The present invention will be further described in detail below with reference to embodiments and comparative examples.

[0036] Examples 1-3 and Comparative Examples 1-4 provide an ozone-resistant and fatigue-resistant high-pressure air pipe.

[0037] Example 1 This embodiment provides an ozone-resistant and fatigue-resistant high-pressure air tube, which is prepared by the following steps: Step S1: Preparation of the airtight layer: The airtight layer comprises the following raw materials in parts by weight: 100 parts high-density polyethylene, 12 parts polyolefin elastomer, 3 parts maleic anhydride grafted polyethylene, 0.1 parts FX5911, and 0.1 parts antioxidant. The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.2. The above raw materials are placed at room temperature and stirred at 400 rpm for 3 minutes until uniformly mixed. Then, the mixture is extruded through a twin-screw extruder to obtain the airtight layer. The extrusion process of the twin-screw extruder is as follows: Zone 1 170℃, Zone 2 180℃, Zone 3 185℃, Zone 4 190℃, Zone 5 195℃, die head temperature 200℃, screw speed 200 rpm. Step S2: Preparation of the reinforcing layer: The functionalized polyolefin elastomer is extruded to initially form a 2.8mm thick tubular shape that matches the airtight layer. This is then stretched to tightly cover the airtight layer, forming the reinforcing layer. The functionalized polyolefin elastomer, by weight, consists of 80 parts polyolefin elastomer, 6 parts ternary copolymer rubber, 2.4 parts functional filler, 3.4 parts maleic anhydride-grafted polyethylene, 0.8 parts tert-butyl peroxycarbonate-2-ethylhexyl ester, and 0.03 parts stearic acid. These components are placed at room temperature and stirred at 490 rpm for 6 minutes until uniformly mixed. The mixture is then extruded using a twin-screw extruder. The extrusion process of the twin-screw extruder is as follows: Zone 1: 150℃, Zone 2: 165℃, Zone 3: 175℃, Zone 4: 180℃, Zone 5: 175℃, Die head temperature: 175℃; Screw speed: 260 rpm. Step S3: Preparation of high-pressure air tube: Weather-resistant silicone rubber is directly extruded onto the outside of the reinforcing layer to form a tightly structured protective layer, resulting in an ozone-resistant and fatigue-resistant high-pressure air tube. The functional filler is prepared by the following steps: Step A1: Dissolve tetraethyl orthosilicate in a 32% (w / w) aqueous ethanol solution, add nano-zinc oxide, and sonicate for 24 min at a frequency of 30 kHz and a power of 450 W until homogeneous. Adjust the pH to 8 with sodium carbonate-sodium bicarbonate buffer, add polyethylene glycol octylphenyl ether and Tween-20, control the rotation speed at 1000 rpm, emulsify for 3 min, centrifuge, and wash three times each with deionized water and anhydrous ethanol (each time the mass of deionized water and anhydrous ethanol is 50% of the mass of the aqueous ethanol solution). Dry at 50°C to constant weight to obtain porous core-shell particles. The mass ratio of tetraethyl orthosilicate, aqueous ethanol solution, nano-zinc oxide, polyethylene glycol octylphenyl ether, and Tween-20 is 6:26:1:0.2:0.016. Step A2: The core-shell particles, deionized water, anhydrous ethanol, and KH-550 were ultrasonically sonicated at a frequency of 40 kHz and a power of 550 W for 20 minutes until homogeneous. The temperature was then raised to 48°C, and the stirring speed was controlled at 560 rpm for 5.4 hours. After centrifugation, the particles were washed three times with deionized water (each time the deionized water mass was 20% of the anhydrous ethanol mass). The particles were dried at 64°C to constant weight to obtain amination-modified core-shell particles. The amination-modified core-shell particles and octenyl succinic anhydride were added to anhydrous DMF and stirred at 640 rpm for 18 minutes until homogeneous. Triethylamine was added dropwise, maintaining a concentration of 10 mg / L. After the first drop was completed, the dropping rate was controlled at 3 drops / second. After the dropping was completed, the temperature was raised to 64℃, and the stirring speed was kept constant. The reaction was continued for 2.4 hours. The precipitate was centrifuged and washed three times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water was 20% of the mass of anhydrous DMF). The precipitate was dried at 60℃ to constant weight to obtain the functional filler. The mass ratio of core-shell particles, deionized water, anhydrous ethanol and KH-550 was 2.6:10:24:0.16, and the mass ratio of aminated core-shell particles, octenyl succinic anhydride, anhydrous DMF and triethylamine was 2.2:1.4:40:0.2.

[0038] The weather-resistant silicone rubber comprises the following raw materials in parts by weight: 60 parts methyl vinyl silicone rubber raw rubber, 34 parts thermoplastic polyurethane elastomer, 6 parts reinforcing component, 15 parts trioctyl phosphate, 4.2 parts dibutyl malonate, 1.6 parts L-cyclohexylglycine, 2.8 parts diethylene glycol butyl ether acetate, 0.6 parts accelerator TMTD, and 3.6 parts 2,5-dimethyl-2,5-di-tert-butyl peroxide; Weather-resistant silicone rubber is prepared by the following steps: Step B1: According to the weight parts, add methyl vinyl silicone rubber raw rubber, thermoplastic polyurethane elastomer, reinforcing component, trioctyl phosphate, dibutyl malonate, L-cyclohexylglycine and diethylene glycol butyl ether acetate to a kneader, mix at 80°C for 2.4h, maintain the temperature constant, control the vacuum degree at -0.1MPa, vacuum mix for 3.7h, cool to room temperature, and obtain a vulcanizing agent-free compound; then, pass the vulcanizing agent-free compound, accelerator TMTD and 2,5-dimethyl-2,5-di-tert-butylperoxide through a two-roll mill three times to obtain a vulcanizing agent-containing compound; Step B2: The compound rubber containing vulcanizing agent prepared in Step B1 is extruded through a twin-screw extruder and subjected to a single vulcanization treatment to obtain a single-vulcanized weather-resistant silicone rubber. The specific process parameters for the single vulcanization treatment are as follows: vulcanization pressure is 8 MPa, vulcanization temperature is 160℃, vulcanization time is 12 min, and the extrusion process of the twin-screw extruder is as follows: zone 1 185℃, zone 2 195℃, zone 3 205℃, zone 4 185℃, zone 5 180℃, die head temperature 180℃, and screw speed 300 rpm. Step B3: Perform a secondary vulcanization treatment on the primary vulcanized weather-resistant silicone rubber to obtain weather-resistant silicone rubber. The specific process parameters for the secondary vulcanization treatment are: vulcanization pressure of 0.1 MPa, vulcanization temperature of 160℃, and vulcanization time of 4.2 h. The reinforcing component is prepared by the following steps: Step C1: The graphene oxide solution was ultrasonically dispersed in a Tris-HCl buffer solution at pH 8. The ultrasonic frequency was controlled at 30 kHz, the ultrasonic power at 450 W, and the ultrasonic time at 22 min. Dopamine was then added, and the stirring speed was controlled at 680 rpm. The mixture was stirred for 3 h, filtered, and washed three times with deionized water (each time the deionized water mass was 15% of the mass of the Tris-HCl buffer solution). The mixture was dried at 62 °C to constant weight to obtain modified graphene oxide. The mass ratio of graphene oxide solution, Tris-HCl buffer solution, and dopamine was 16:30:2. The graphene oxide solution was composed of graphene oxide, anhydrous ethanol, and deionized water in a mass ratio of 1:40:40. Step C2: Add modified graphene oxide to anhydrous DMF and stir at 640 rpm for 16 min until homogeneous. Add a mixture of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF dropwise. After the addition is complete, heat to 78℃, maintain the stirring speed, and continue stirring for 3.2 h. Centrifuge to precipitate, and wash three times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water is 20% of the mass of anhydrous DMF). Dry at 68℃ to constant weight to obtain the reinforcing component. The mass ratio of modified graphene oxide, anhydrous DMF, and mixture a is 1:40:20. In mixture a, the mass ratio of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF is 0.40:0.20:0.36:10.

[0039] Example 2 This embodiment provides an ozone-resistant and fatigue-resistant high-pressure air tube, which is prepared by the following steps: Step S1: Preparation of the airtight layer: The airtight layer comprises the following raw materials in parts by weight: 110 parts high-density polyethylene, 14 parts polyolefin elastomer, 5.5 parts maleic anhydride grafted polyethylene, 0.2 parts FX5924, and 0.3 parts antioxidant. The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.3. The above raw materials are placed at room temperature and stirred at 450 rpm for 4 minutes until uniformly mixed. Then, the mixture is extruded through a twin-screw extruder to obtain the airtight layer. The extrusion process of the twin-screw extruder is as follows: Zone 1 176℃, Zone 2 183℃, Zone 3 186℃, Zone 4 193℃, Zone 5 196℃, die head temperature 200℃, screw speed 200 rpm. Step S2, Preparation of the reinforcing layer: The functionalized polyolefin elastomer is extruded to initially form a 2.9mm thick tubular shape that matches the airtight layer. This is then stretched to tightly cover the airtight layer, forming the reinforcing layer. The functionalized polyolefin elastomer, by weight, consists of 90 parts polyolefin elastomer, 9 parts ternary copolymer rubber, 3.8 parts maleic anhydride-grafted polyethylene, 2.6 parts functional filler, 1.2 parts tert-amyl peroxide-2-ethylhexyl carbonate, and 0.04 parts stearic acid. These components are placed at room temperature and stirred at 520 rpm for 8 minutes until uniformly mixed. The mixture is then extruded using a twin-screw extruder. The extrusion process of the twin-screw extruder is as follows: Zone 1 155℃, Zone 2 170℃, Zone 3 180℃, Zone 4 185℃, Zone 5 180℃, die head temperature 175℃, screw speed 270 rpm. Step S3: Preparation of high-pressure air tube: Weather-resistant silicone rubber is directly extruded onto the outside of the reinforcing layer to form a tightly structured protective layer, resulting in an ozone-resistant and fatigue-resistant high-pressure air tube. The functional filler is prepared by the following steps: Step A1: Dissolve tetraethyl orthosilicate in a 34% (w / w) aqueous ethanol solution, add nano-zinc oxide, and sonicate for 20 min at a frequency of 35 kHz and a power of 500 W until homogeneous. Adjust the pH to 8.5 with sodium carbonate-sodium bicarbonate buffer, add hexadecyltrimethylammonium bromide and Tween-40, control the rotation speed at 1100 rpm, emulsify for 4 min, centrifuge, and wash 4 times each with deionized water and anhydrous ethanol (each time the mass of deionized water and anhydrous ethanol is 50% of the mass of the aqueous ethanol solution). Dry at 55℃ to constant weight to obtain porous core-shell particles, wherein the mass ratio of tetraethyl orthosilicate, aqueous ethanol solution, nano-zinc oxide, hexadecyltrimethylammonium bromide and Tween-40 is 9:28:1.5:0.3:0.018; Step A2: The core-shell particles, deionized water, anhydrous ethanol, and KH-550 were ultrasonically sonicated at a frequency of 35 kHz and a power of 500 W for 22 minutes until homogeneous. The temperature was then raised to 52°C, and the stirring speed was controlled at 580 rpm for 5.7 hours. After centrifugation, the particles were washed four times with deionized water (each time the deionized water mass was 20% of the anhydrous ethanol mass). The particles were dried at 66°C to constant weight to obtain amination-modified core-shell particles. The amination-modified core-shell particles and octenyl succinic anhydride were added to anhydrous DMF and stirred at 660 rpm for 22 minutes until homogeneous. Triethylamine was added dropwise, maintaining a concentration of 10 mg / L. After the droplets were added within 1 minute, the dropping rate was controlled at 4 drops / second. After the dropping was completed, the temperature was raised to 66℃, and the stirring speed was kept constant. The reaction was continued for 2.6 hours. The precipitate was centrifuged and washed 4 times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water was 20% of the mass of anhydrous DMF). The precipitate was dried at 64℃ to constant weight to obtain the functional filler. The mass ratio of core-shell particles, deionized water, anhydrous ethanol and KH-550 was 2.8:13:27:0.23, and the mass ratio of aminated core-shell particles, octenyl succinic anhydride, anhydrous DMF and triethylamine was 2.2:1.6:45:0.3. The weather-resistant silicone rubber comprises the following raw materials in parts by weight: 62 parts methyl vinyl silicone rubber raw rubber, 35 parts thermoplastic polyurethane elastomer, 7 parts reinforcing component, 15.5 parts trioctyl phosphate, 4.5 parts dibutyl malonate, 1.9 parts L-cyclohexylglycine, 3.1 parts diethylene glycol butyl ether acetate, 0.7 parts accelerator TMTD, and 3.8 parts 2,4-dichlorobenzoyl peroxide; Weather-resistant silicone rubber is prepared by the following steps: Step B1: According to the weight parts, add methyl vinyl silicone rubber raw rubber, thermoplastic polyurethane elastomer, reinforcing component, trioctyl phosphate, dibutyl malonate, L-cyclohexylglycine and diethylene glycol butyl ether acetate to a kneader, mix at 90°C for 2.5h, maintain the temperature constant, control the vacuum degree at -0.1MPa, vacuum mix for 3.9h, cool to room temperature, and obtain a vulcanizing agent-free compound; then, pass the vulcanizing agent-free compound, accelerator TMTD and 2,4-dichlorobenzoyl peroxide through a two-roll mill four times to obtain a vulcanizing agent-containing compound; Step B2: The compound rubber containing vulcanizing agent prepared in Step B1 is extruded through a twin-screw extruder and subjected to a single vulcanization treatment to obtain a single-vulcanized weather-resistant silicone rubber. The specific process parameters for the single vulcanization treatment are as follows: vulcanization pressure is 12 MPa, vulcanization temperature is 170℃, vulcanization time is 15 min, and the extrusion process of the twin-screw extruder is as follows: zone 1 190℃, zone 2 200℃, zone 3 210℃, zone 4 190℃, zone 5 185℃, die head temperature 180℃, and screw speed 350 rpm. Step B3: Perform a secondary vulcanization treatment on the primary vulcanized weather-resistant silicone rubber. The specific process parameters for the secondary vulcanization treatment are: vulcanization pressure of 0.1 MPa, vulcanization temperature of 200℃, and vulcanization time of 4.4 h. The reinforcing component is prepared by the following steps: Step C1: The graphene oxide solution was ultrasonically dispersed in a Tris-HCl buffer solution with a pH of 8.5. The ultrasonic frequency was controlled at 35 kHz, the ultrasonic power at 500 W, and the ultrasonic time at 24 min. Dopamine was then added, and the stirring speed was controlled at 700 rpm. The mixture was stirred for 4 h, filtered, and washed 4 times with deionized water (each time the deionized water mass was 15% of the mass of the Tris-HCl buffer solution). The mixture was dried at 66 °C to constant weight to obtain modified graphene oxide. The mass ratio of graphene oxide solution, Tris-HCl buffer solution, and dopamine was 18:35:3. The graphene oxide solution was composed of graphene oxide, anhydrous ethanol, and deionized water in a mass ratio of 1:50:50. Step C2: Add modified graphene oxide to anhydrous DMF and stir at 660 rpm for 20 min until homogeneous. Add a mixture of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF dropwise. After the addition is complete, heat to 80℃, maintain the stirring speed, and continue stirring for 3.4 h. Centrifuge to precipitate, and wash with anhydrous ethanol and deionized water four times each (each time the mass of anhydrous ethanol and deionized water is 20% of the mass of anhydrous DMF). Dry at 70℃ to constant weight to obtain the reinforcing component. The mass ratio of modified graphene oxide, anhydrous DMF, and mixture a is 1:45:25. In mixture a, the mass ratio of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF is 0.44:0.22:0.38:10.

[0040] Example 3 This embodiment provides an ozone-resistant and fatigue-resistant high-pressure air tube, which is prepared by the following steps: Step S1: Preparation of the airtight layer: The airtight layer comprises the following raw materials in parts by weight: 120 parts high-density polyethylene, 16 parts polyolefin elastomer, 8 parts maleic anhydride grafted polyethylene, 0.3 parts FX5911, and 0.5 parts antioxidant, wherein the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.4; the above raw materials are placed at room temperature and stirred at 500 rpm for 5 minutes until uniformly mixed, and then extruded through a twin-screw extruder to obtain the airtight layer. The extrusion process of the twin-screw extruder is as follows: Zone 1 180℃, Zone 2 185℃, Zone 3 190℃, Zone 4 195℃, Zone 5 200℃, die head temperature 200℃; screw speed 200 rpm; Step S2: Preparation of the reinforcing layer: The functionalized polyolefin elastomer is extruded to initially form a 3mm thick tubular shape that matches the airtight layer. This tubular shape is then stretched to tightly cover the airtight layer, forming the reinforcing layer. The functionalized polyolefin elastomer, by weight, consists of 100 parts polyolefin elastomer, 12 parts ternary copolymer rubber, 4.2 parts maleic anhydride-grafted polyethylene, 2.8 parts functional filler, 1.6 parts tert-butyl peroxycarbonate-2-ethylhexyl ester, and 0.05 parts stearic acid. These components are placed at room temperature and stirred at 550 rpm for 10 minutes until uniformly mixed. The mixture is then extruded using a twin-screw extruder to obtain the desired product. The extrusion process of the twin-screw extruder is as follows: Zone 1: 160℃, Zone 2: 175℃, Zone 3: 185℃, Zone 4: 190℃, Zone 5: 185℃, Die head temperature: 175℃; Screw speed: 280 rpm. Step S3: Preparation of high-pressure air tube: Weather-resistant silicone rubber is directly extruded onto the outside of the reinforcing layer to form a tightly structured protective layer, resulting in an ozone-resistant and fatigue-resistant high-pressure air tube. The functional filler is prepared by the following steps: Step A1: Dissolve tetraethyl orthosilicate in a 36% (w / w) aqueous ethanol solution, add nano-zinc oxide, and sonicate for 16 min at an ultrasonic frequency of 40 kHz and an ultrasonic power of 550 W until homogeneous. Adjust the pH to 9 with sodium carbonate-sodium bicarbonate buffer, add polyethylene glycol octylphenyl ether and Tween-60, control the rotation speed at 1200 rpm, emulsify for 5 min, centrifuge, and wash 5 times each with deionized water and anhydrous ethanol (each time the mass of deionized water and anhydrous ethanol is 50% of the mass of the aqueous ethanol solution). Dry at 60℃ to constant weight to obtain porous core-shell particles, wherein the mass ratio of tetraethyl orthosilicate, aqueous ethanol solution, nano-zinc oxide, polyethylene glycol octylphenyl ether and Tween-60 is 12:30:2:0.4:0.02; Step A2: The core-shell particles, deionized water, anhydrous ethanol, and KH-550 were ultrasonically sonicated at a frequency of 30 kHz and a power of 450 W for 26 minutes until homogeneous. The temperature was then raised to 56°C, and the stirring speed was controlled at 600 rpm for 6 hours. After centrifugation, the particles were washed five times with deionized water (each time the deionized water mass was 20% of the anhydrous ethanol mass). The particles were dried at 68°C to constant weight to obtain amination-modified core-shell particles. The amination-modified core-shell particles and octenyl succinic anhydride were added to anhydrous DMF and stirred at 680 rpm for 24 minutes until homogeneous. Triethylamine was added dropwise, maintaining a concentration of 10 mg / L. After the first drop was completed, the dropping rate was controlled at 5 drops / second. After the dropping was completed, the temperature was raised to 68℃, and the stirring speed was kept constant. The reaction was continued for 2.8 hours. The precipitate was centrifuged and washed 5 times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water was 20% of the mass of anhydrous DMF). The precipitate was dried at 68℃ to constant weight to obtain the functional filler. The mass ratio of core-shell particles, deionized water, anhydrous ethanol and KH-550 was 3:16:30:0.3, and the mass ratio of aminated core-shell particles, octenyl succinic anhydride, anhydrous DMF and triethylamine was 2.2:1.8:50:0.4. The weather-resistant silicone rubber comprises the following raw materials in parts by weight: 64 parts methyl vinyl silicone rubber raw rubber, 36 parts thermoplastic polyurethane elastomer, 8 parts reinforcing components, 16 parts trioctyl phosphate, 4.8 parts dibutyl malonate, 2.2 parts L-cyclohexylglycine, 3.4 parts diethylene glycol butyl ether acetate, 0.8 parts accelerator TMTD, and 4 parts 2,5-dimethyl-2,5-di-tert-butyl peroxide; Weather-resistant silicone rubber is prepared by the following steps: Step B1: According to the weight parts, add methyl vinyl silicone rubber raw rubber, thermoplastic polyurethane elastomer, reinforcing component, trioctyl phosphate, dibutyl malonate, L-cyclohexylglycine and diethylene glycol butyl ether acetate to a kneader, mix at 100°C for 2.6 h, maintain the temperature constant, control the vacuum degree at -0.1 MPa, vacuum mix for 4.1 h, cool to room temperature, and obtain a vulcanizing agent-free compound; then, pass the vulcanizing agent-free compound, accelerator TMTD and 2,5-dimethyl-2,5-di-tert-butyl peroxide through a two-roll mill 5 times to obtain a vulcanizing agent-containing compound; Step B2: The compound rubber containing vulcanizing agent prepared in Step B1 is extruded through a twin-screw extruder and subjected to a single vulcanization treatment to obtain a single-vulcanized weather-resistant silicone rubber. The specific process parameters for the single vulcanization treatment are as follows: vulcanization pressure is 15 MPa, vulcanization temperature is 180℃, vulcanization time is 18 min, and the extrusion process of the twin-screw extruder is as follows: zone 1 195℃, zone 2 205℃, zone 3 215℃, zone 4 195℃, zone 5 190℃, die head temperature 180℃, and screw speed 400 rpm. Step B3: Perform a secondary vulcanization treatment on the primary vulcanized weather-resistant silicone rubber to obtain weather-resistant silicone rubber. The specific process parameters for the secondary vulcanization treatment are: vulcanization pressure of 0.1 MPa, vulcanization temperature of 240℃, and vulcanization time of 4.6 h. The reinforcing component is prepared by the following steps: Step C1: The graphene oxide solution was ultrasonically dispersed in a Tris-HC1 buffer solution at pH 9. The ultrasonic frequency was controlled at 40 kHz, the ultrasonic power at 550 W, and the ultrasonic time at 26 min. Dopamine was then added, and the stirring speed was controlled at 720 rpm. The mixture was stirred for 5 h, filtered, and washed 5 times with deionized water (each time the deionized water mass was 15% of the mass of the Tris-HC1 buffer solution). The mixture was dried at 70 °C to constant weight to obtain modified graphene oxide. The mass ratio of graphene oxide solution, Tris-HC1 buffer solution, and dopamine was 20:40:4. The graphene oxide solution was composed of graphene oxide, anhydrous ethanol, and deionized water in a mass ratio of 1:60:60. Step C2: Add modified graphene oxide to anhydrous DMF and stir at 680 rpm for 24 min until homogeneous. Add a mixture of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF dropwise. After the addition is complete, raise the temperature to 82℃, maintain the stirring speed, and continue stirring for 3.6 h. Centrifuge to precipitate, and wash with anhydrous ethanol and deionized water 5 times each (each time the mass of anhydrous ethanol and deionized water is 20% of the mass of anhydrous DMF). Dry at 72℃ to constant weight to obtain the reinforcing component. The mass ratio of modified graphene oxide, anhydrous DMF, and mixture a is 1:50:30. In mixture a, the mass ratio of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF is 0.48:0.24:0.4:10.

[0041] Comparative Example 1 Comparative Example 1 is the same as Example 1, except that in the preparation of the functional filler, nano zinc oxide is replaced with an equal mass of nano titanium dioxide.

[0042] Comparative Example 2 Comparative Example 2 is the same as Example 1, except that in the preparation of the functional filler, octenyl succinic anhydride is replaced with an equal mass of itaconic anhydride.

[0043] Comparative Example 3 Comparative Example 3 is the same as Example 1, except that in the preparation of the reinforcing component, trans-cinnamic acid is replaced with an equal mass of acrylic acid.

[0044] Comparative Example 4 Comparative Example 4 is the same as Example 1, except that in the preparation of the reinforcing component, trans-cinnamic acid is replaced with an equal mass of 3-phenylpropionic acid.

[0045] Performance testing 1. The high-pressure air tube reinforcement layers prepared in Examples 1-3 and Comparative Examples 1-2 were tested for tensile strength according to GB / T1040.1-2025 "Determination of Tensile Properties of Plastics"; the polyolefin materials prepared in the examples and comparative examples were made into dumbbell-shaped specimens and placed in a thermo-oxidative aging chamber for 168 hours at 180°C and 160 air changes / h. The elongation at break retention rate before and after treatment was determined according to GB / T 1040.1-2025 "Determination of Tensile Properties of Plastics". The specific test results are shown in Table 1. Table 1. Results of Tensile Strength and Elongation at Break Retention of High-Pressure Air Tube Reinforcement Layer As shown in Table 1, compared with Comparative Examples 1-2, the high-pressure air tube reinforcement layer prepared by the method provided in Examples 1-3 has higher tensile strength and elongation at break, which indicates that the high-pressure air tube reinforcement layer prepared by the method provided in this invention has better tensile strength and high temperature resistance.

[0046] 2. The high-pressure air tube protective layers prepared in Examples 1-3 and Comparative Examples 3-4 were tested. The water vapor transmission coefficient was determined according to GB / T1037-2021 "Determination of Water Vapor Transmission Performance of Plastic Films and Sheets - Cup Method for Weight Gain and Loss". The test temperature was 38°C and the relative humidity was 90%. Each sample was tested three times, and the average value was taken. The oil resistance of the high-pressure air tube reinforcement layer was tested according to the national recommended standard GB / T 1690-2023 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber". The oil was liquid B (30% toluene, 70% isooctane). The sample was a type I sample with a thickness of 2 mm. The full immersion mode was adopted. First, it was immersed at 23°C for 168 h, and the volume change rate was tested (expressed as 23°C × 168 h). Then, it was dried at 70°C for 96 h and the volume change rate was tested again (expressed as 70°C × 96 h). The specific test results are shown in Table 2. Table 2. Results of tests on the impermeability and oil resistance of the high-pressure gas pipe protective layer. As shown in Table 2, compared with Comparative Examples 3-4, the high-pressure air pipe protective layer prepared by the method provided in Examples 1-3 has a lower water vapor permeability and volume change rate. This indicates that the high-pressure air pipe protective layer prepared by the method provided in this invention has better impermeability and oil resistance.

[0047] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An ozone-resistant and fatigue-resistant high-pressure air hose, characterized in that, It is prepared by the following steps: Step S1: Preparation of the airtight layer: The airtight layer comprises the following raw materials in parts by weight: 100-120 parts high-density polyethylene, 12-16 parts polyolefin elastomer, 3-8 parts maleic anhydride grafted polyethylene, 0.1-0.3 parts processing aids and 0.1-0.5 parts antioxidants; the above raw materials are mixed evenly and then extruded through a twin-screw extruder to obtain the airtight layer; Step S2, Preparation of reinforcing layer: Functionalized polyolefin elastomer is extruded to initially form a tubular shape with a thickness of 2.8-3mm that matches the airtight layer. It is then stretched to cover the airtight layer to form a reinforcing layer. Step S3: Preparation of high-pressure air tube: Weather-resistant silicone rubber is directly extruded onto the outside of the reinforcing layer to form a tightly structured protective layer, thus obtaining an ozone-resistant and fatigue-resistant high-pressure air tube. The functionalized polyolefin elastomer is prepared by uniformly mixing 80-100 parts of polyolefin elastomer, 6-12 parts of ternary copolymer rubber, 3.4-4.2 parts of maleic anhydride grafted polyethylene, 2.4-2.8 parts of functional filler, 0.8-1.6 parts of peroxide crosslinking agent and 0.03-0.05 parts of functional additives by weight, and then extruding it through a twin-screw extruder. The weather-resistant silicone rubber comprises the following raw materials in parts by weight: 60-64 parts methyl vinyl silicone rubber raw rubber, 34-36 parts thermoplastic polyurethane elastomer, 6-8 parts reinforcing component, 15-16 parts trioctyl phosphate, 4.2-4.8 parts dibutyl malonate, 1.6-2.2 parts L-cyclohexylglycine, 2.8-3.4 parts diethylene glycol butyl ether acetate, 0.6-0.8 parts accelerator and 3.6-4 parts vulcanizing agent.

2. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 1, characterized in that, The functional filler is prepared by the following steps: Step A1: Dissolve tetraethyl orthosilicate in an ethanol aqueous solution, add nano zinc oxide, ultrasonically disperse evenly, adjust pH to 8-9, add pore-forming agent and emulsifier, emulsify for 3-5 minutes, centrifuge, wash, and dry to obtain porous core-shell particles; Step A2: Mix the core-shell particles, deionized water, anhydrous ethanol, and KH-550 ultrasonically until homogeneous. Heat to 48-56℃ and continue stirring for 5.4-6 hours. Centrifuge, wash, and dry to obtain aminated core-shell particles. Add the aminated core-shell particles and octenyl succinic anhydride to anhydrous DMF and stir until homogeneous. Add triethylamine dropwise. After the addition is complete, heat to 64-68℃ and stir for 2.4-2.8 hours. Centrifuge to precipitate, wash, and dry to obtain the functional filler.

3. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 2, characterized in that, In step A1, the mass ratio of tetraethyl orthosilicate, aqueous ethanol solution, nano zinc oxide, pore-forming agent, and emulsifier is 6-12:26-30:1-2:0.2-0.4:0.016-0.

02.

4. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 2, characterized in that, In step A2, the mass ratio of core-shell particles, deionized water, anhydrous ethanol, and KH-550 is 2.6-3:10-16:24-30:0.16-0.3; the mass ratio of aminated core-shell particles, octenyl succinic anhydride, anhydrous DMF, and triethylamine is 2.2:1.4-1.8:40-50:0.2-0.

4.

5. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 1, characterized in that, The weather-resistant silicone rubber is prepared by the following steps: Step B1: According to the weight parts, add methyl vinyl silicone rubber raw rubber, thermoplastic polyurethane elastomer, reinforcing component, trioctyl phosphate, dibutyl malonate, L-cyclohexylglycine and diethylene glycol butyl ether acetate to a kneader, mix at 80-100℃ for 2.4-2.6h, maintain the temperature, vacuum mix for 3.7-4.1h, cool to room temperature to obtain a vulcanizing agent-free compound; then pass the vulcanizing agent-free compound, accelerator and vulcanizing agent through a thin pass to obtain a vulcanizing agent-containing compound; Step B2: The compound containing vulcanizing agent prepared in step B1 is extruded into shape by a twin-screw extruder and subjected to a single vulcanization treatment to obtain a single-vulcanized weather-resistant silicone rubber. Step B3: Perform a second vulcanization treatment on the primary vulcanized weather-resistant silicone rubber to obtain weather-resistant silicone rubber.

6. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 1, characterized in that, The reinforcing component is prepared by the following steps: Step C1: The graphene oxide solution was ultrasonically dispersed in Tris-HCl buffer solution with pH 8-9, then dopamine was added, the mixture was stirred for 3-5 hours, filtered, washed, and dried to obtain modified graphene oxide. Step C2: Add modified graphene oxide to anhydrous DMF, stir evenly, and dropwise add a mixture of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid and anhydrous DMF. After the addition is complete, heat to 78-82℃, stir and react for 3.2-3.6 hours, centrifuge to precipitate, wash, and dry to obtain the reinforcing component.

7. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 6, characterized in that, In step C1, the mass ratio of graphene oxide solution, Tris-HCl buffer, and dopamine is 16-20:30-40:2-4. The graphene oxide solution is composed of graphene oxide, anhydrous ethanol, and deionized water in a mass ratio of 1:40-60:40-60.

8. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 6, characterized in that, In step C2, the mass ratio of modified graphene oxide, anhydrous DMF, and mixture a is 1:40-50:20-30, and the mass ratio of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, trans-cinnamic acid, and anhydrous DMF in mixture a is 0.40-0.48:0.20-0.24:0.36-0.4:

10.

9. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 1, characterized in that, The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0.2-0.

4.

10. The ozone-resistant and fatigue-resistant high-pressure air pipe according to claim 1, characterized in that, In step S1, the extrusion process of the twin-screw extruder is as follows: Zone 1 170-180℃, Zone 2 180-185℃, Zone 3 185-190℃, Zone 4 190-195℃, Zone 5 195-200℃, die head temperature 200℃, and screw speed 200rpm.

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