Polyamide material, preparation method thereof and application of polyamide material in transportation, distribution or storage of hydrogen

Abstract

The invention discloses a polyamide material which comprises the following components in parts by weight: 59-71 parts of polyamide resin; 3-30 parts of active group grafted rubber containing a repeating unit derived from olefin; 0.5 to 10 parts of high density polyethylene; and 5-60 parts of a ketone carbonyl polymer. The high-density polyethylene is added into the polyamide resin, so that the mechanical property is improved, and meanwhile, the good gas barrier property is kept; meanwhile, active group grafted rubber containing a repetitive unit derived from olefin is selected, so that the compatibility of polyamide resin and high-density polyethylene can be improved, the toughness can be improved, and the foaming behavior in the hydrogen cycle test process can be improved; the infrared welding of the gas barrier polyamide material can be firmer, the foaming in the hydrogen circulation test process can be further improved, and the polyamide composite material is particularly suitable for being applied to the field of hydrogen transportation, distribution or storage.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly to a polyamide material, a preparation method thereof, and an application thereof in the transportation, distribution or storage of hydrogen. Background Art

[0002] How to improve energy density, reliability, safety and economy during use in storage is a key challenge for the widespread commercialization of fuel cell electric vehicles (FCEVs) and other hydrogen fuel cell applications. Although some light FCEVs have emerged in limited markets at present, affordable on-vehicle hydrogen storage remains a major obstacle. The linings of high-pressure gas storage tanks have single-layer structures and multi-layer structures. Single-layer structures usually use polyamide, and generally require a thickness of not less than 4 mm to meet hydrogen permeation requirements or other design purposes.

[0003] In the prior art, it is difficult for the polyamide lining of a high-pressure gas storage tank to simultaneously have the advantages of good hydrogen barrier property and no foaming during the hydrogen circulation test process.

[0004] The fundamental reason for the foaming behavior during the hydrogen circulation test process is that during the low-pressure - high-pressure hydrogen circulation process, the rapid pressure difference change causes the hydrogen molecules in the internal structure of the material to be unable to quickly adjust to the equilibrium state under the action of diffusion along the concentration gradient, resulting in micro-cracks at the accumulation position and continuously expanding into a bulging structure. For plastic linings with interfaces, defects, and holes, this kind of behavior is more likely to occur, such as the foaming behavior of the multi-layer structure described in US11359766 B2. Another example is in rotational molding. When powder entrained with gas and moisture cannot eliminate bubbles in time during the molding process, it not only damages the structural strength of the lining but also becomes the initiation point for subsequent foaming.

[0005] Chinese Patent Application CN101831170A discloses a high-viscosity PA6 / PE alloy, which includes 75 - 90% of PA6, 5 - 15% of PE, 3 - 5% of a toughening agent, and 2 - 5% of a compatibilizer. Among them, the toughening agent is a core-shell type impact modifier of acrylate-methyl methacrylate-styrene copolymer or a silicon-modified acrylic impact modifier; the compatibilizer is a graft or block copolymer of PA6 and PE. It also discloses that the alloy has the characteristic of good gas barrier property. However, first, this patent does not record the test results of its gas barrier property; second, this patent is mainly used for corrugated pipes, automotive hoses, and automotive oil bottles, but these products do not require gas barrier performance; third, this patent records that the melting point of PE is 160 - 180 °C, far exceeding the melting point range of conventional PE, and those skilled in the art cannot repeat the experimental results. Fourth, the toughening agent of this patent does not contain active groups, and the silicon-modified acrylic impact modifier also has insufficient compatibility with PE. Therefore, those skilled in the art can infer that the alloy of this patent cannot improve the foaming behavior during the hydrogen circulation test process. Summary of the Invention

[0006] The object of the present invention is to overcome the above technical defects and provide a polyamide material which has the advantages of good hydrogen barrier property and good infrared welding firmness, and significantly improves the defect of easy foaming during the hydrogen circulation test.

[0007] The present invention is achieved by the following technical solutions:

[0008] A polyamide material, by weight, comprises the following components:

[0009] 59 - 71 parts of polyamide resin;

[0010] 3 - 30 parts of a rubber grafted with active groups and derived from repeating units containing olefins;

[0011] 0.5 - 10 parts of high - density polyethylene;

[0012] 5 - 60 parts of a ketocarbonyl polymer;

[0013] The ketocarbonyl polymer is selected from compounds containing ketone units with an alternating structure of repeating units derived from olefinic comonomers and repeating units derived from carbon monoxide;

[0014] The active groups are selected from at least one of maleic anhydride groups and epoxy groups.

[0015] The density range of the high - density polyethylene is 0.93 g / cm 3 - 0.97 g / cm 3 . Preferably 0.95 g / cm 3 - 0.96 g / cm 3 , measured according to GB / T 19466.1 - 2004.

[0016] The melting point range of the high - density polyethylene is 100 °C - 140 °C, and the test standard is GB / T19466.1 - 2004.

[0017] The melt index range of the high - density polyethylene is 0.1 - 20 g / 10 min, and the test standard is ISO 1133 with test conditions of 190 °C and 2.16 kg.

[0018] In the ketocarbonyl polymer, the olefinic comonomer is selected from one or more of ethylene, propylene, butene, hexene, octene, decene, dodecene, tetradecene, hexadecene, and octadecene.

[0019] In the ketocarbonyl polymer, the ketocarbonyl content of the ketocarbonyl polymer measured by elemental analysis is 20 wt% - 85 wt%; preferably, the ketocarbonyl content of the ketocarbonyl polymer measured by elemental analysis is 35 wt% - 70 wt%.

[0020] The test method for measuring the keto carbonyl content of the keto carbonyl polymer by the described elemental analysis method is as follows:

[0021] Separate and extract the keto carbonyl polymer from the polyamide resin composition using a suitable solvent. The suitable solvent is selected from one or more of toluene, xylene, formic acid, acetic acid, methanol, n-butanol, chloroform, tetrahydrofuran, N,N-dimethylformamide, and dimethyl sulfoxide. Dissolve or swell the polyamide resin composition to obtain a solution or precipitate of the keto carbonyl polymer. Dissolve the obtained solution or precipitate multiple times and perform reduced-pressure rotary distillation to obtain a refined extract of the keto carbonyl polymer;

[0022] For the refined extract of the keto carbonyl polymer, use a chromatographic-grade solvent selected from one or more of toluene, xylene, formic acid, acetic acid, methanol, n-butanol, chloroform, tetrahydrofuran, N,N-dimethylformamide, and dimethyl sulfoxide to prepare a keto carbonyl polymer solution with a concentration of 2 mg / ml - 10 mg / ml. After complete dissolution, filter it, and use ultrasonic waves to remove bubbles from the solution and the mobile phase; then perform elemental analysis on the prepared solution;

[0023] The proportions of carbon, oxygen, and hydrogen elements can be measured by elemental analysis. Among them, the oxygen element comes from the carbonyl oxygen, and the measured proportion is ω oxygen , and the keto carbonyl content of the keto carbonyl polymer can be calculated according to the following formula: ω = ω oxygen ×M CO / M O ; where M CO is the numerical value of the molar mass of the keto carbonyl, with the unit of grams per mole (g / mol) [M CO = 28.01]; M O is the numerical value of the molar mass of the oxygen atom, with the unit of grams per mole (g / mol) [M O = 15.99].

[0024] The preparation method of the keto carbonyl polymer refers to Patent Publication No. CN1035120A.

[0025] The number average molecular weight of the keto carbonyl polymer of the present invention is 10,000 - 300,000, and it is measured using gel permeation chromatography.

[0026] The rubber containing repeating units derived from olefins is selected from at least one of polyolefin rubbers, polyacrylonitrile rubbers containing repeating units derived from olefins, polyacrylic rubbers containing repeating units derived from olefins, and polyester rubbers containing repeating units derived from olefins; preferably, the rubber containing repeating units derived from olefins is selected from polyolefin rubbers.

[0027] In the maleic anhydride group-grafted rubber containing repeating units derived from olefins, the weight percentage of the maleic anhydride group in the maleic anhydride group-grafted rubber is 0.1 wt% - 5 wt%, preferably 0.5 wt% - 2 wt%; in the epoxy group-grafted rubber containing repeating units derived from olefins, the weight percentage of the epoxy group in the epoxy group-grafted rubber is 0.1 wt% - 10 wt%, preferably 2 wt% - 8 wt%.

[0028] Methods for grafting maleic anhydride groups and epoxy groups onto rubber include, but are not limited to: using processing equipment such as single-screw extruders, twin-screw extruders, and internal mixers to carry out reaction to complete the melt grafting of rubber components. Graft monomers (such as maleic anhydride, glycidyl methacrylate GMA) are added in the molten state of the rubber. The reaction temperature is 150 - 200 °C, the rotation speed is 200 - 500 rpm, and the concentration of the reaction monomer is controlled. Initiators such as dicumyl peroxide and benzoyl peroxide can be selected, and the dosage is not higher than 0.3% of the total feed weight. The graft monomers for epoxy groups can be glycidyl methacrylate GMA, glycidyl acrylate, etc.

[0029] Specifically, the polyolefin rubber is selected from at least one of saturated polyolefin rubbers and unsaturated polyolefin rubbers; the saturated polyolefin rubbers are selected from ethylene-octene copolymers, polyethylene rubbers, polypropylene rubbers, polyisobutylene rubbers, ethylene-propylene rubbers, linear low-density polyethylene rubbers, ethylene-butene rubbers, chlorinated polyethylene rubbers; the unsaturated polyolefin rubbers are selected from at least one of ethylene-propylene-diene rubbers, butadiene-styrene rubbers, styrene-ethylene-butadiene-styrene block copolymers, ethylene-propylene-butadiene rubbers, styrene-butadiene-styrene copolymers, and styrene-isoprene copolymers;

[0030] Specifically, the polyacrylonitrile rubber containing repeating units derived from olefins is selected from at least one of butadiene-acrylonitrile rubbers, hydrogenated butadiene acrylonitrile rubbers, acrylonitrile isoprene rubbers, and acrylonitrile-butadiene-styrene copolymers;

[0031] Specifically, the polyacrylic rubber containing repeating units derived from olefins is selected from at least one of ethylene-acrylic acid polymers and ethylene-acrylic acid ionomers;

[0032] Specifically, the polyester rubber containing repeating units derived from olefins is selected from at least one of ethylene-acrylate rubbers, ethylene-vinyl acetate polymers, butadiene-acrylate rubbers, ethylene-butyl acrylate-glycidyl methacrylate copolymers, and methacrylate-butadiene-styrene type core / shell elastomers.

[0033] The polyamide resin described above is selected from at least one of aliphatic polyamide resins and semi-aromatic polyamide resins.

[0034] The aliphatic polyamide resin is selected from PA66, PA46, PA610, PA612, PA56, PA510, PA512, PA910, PA912, PA913, PA914, PA915, PA616, PA936, PA1010, PA1012, PA1013, PA1014, PA1210, PA1212, PA1213, PA1214, PA614, PA613, PA615, PA616, etc.

[0035] The semi-aromatic polyamide is selected from PA MXD6, PA10T, PA10T1010, PA10T66, PA6T, PA6T66, PA9T, etc.

[0036] The polycaprolactam is selected from PA5, PA6, PA11, PA12, etc.

[0037] In the polyamide material of the present invention, the weight percentage of the polyamide resin in the total polyamide material is not less than 33 wt%.

[0038] The relative viscosity of the polyamide resin is selected to be 2.0 - 4.0. According to the ISO 307:2007 standard, concentrated sulfuric acid with a mass concentration of 96% is used. The melting point range of the polyamide resin can be 170 - 330 °C.

[0039] Whether to add 0 - 2 parts of additives can be selected according to actual needs. The additives are selected from at least one of mold release agents, antioxidants, lubricants, colorants, light stabilizers, antistatic agents, and anti-aging agents.

[0040] The preparation method of the polyamide material of the present invention includes the following steps: Mix each component evenly according to the ratio, and extrude and pelletize through a twin-screw extruder. The screw temperature range can be selected from 250 - 330 °C, and the rotation speed range can be selected from 100 - 800 rpm to obtain the polyamide material.

[0041] The application of the polyamide material of the present invention is for transporting, distributing, or storing hydrogen.

[0042] The present invention also provides a pipeline or container for transporting, distributing, or storing gas, which contains a material layer made of the above polyamide material. Preferably, the structure of the material layer is in direct contact with the gas. The material layer can be the lining structure, layered structure, or film structure of the pipeline or container.

[0043] In one embodiment, the pressure range of the gas is 0.3 - 100 MPa.

[0044] Preferably, the pipeline or container for transporting, distributing or storing gas is a pipeline or container for transporting, distributing or storing hydrogen, including but not limited to a pressure hydrogen storage tank and a hydrogen transportation pipeline. The present invention has the following beneficial effects:

[0045] A ketocarbonyl polymer containing an alternating structure of repeating units derived from an olefinic comonomer and repeating units derived from carbon monoxide, the carbonyl of which can form a hydrogen bond with a polyamide, and the chain segment structure of the olefinic comonomer is compatible with high-density polyethylene and spontaneously distributes at the interface between the polyamide and the polyethylene, reducing the interfacial tension, enabling the polyethylene to be well dispersed and reducing stress concentration, and improving the firmness of infrared welding; the ketocarbonyl polymer also has excellent crystallization properties, improving the barrier properties of the material; due to the compatibilizing effect provided by the ketocarbonyl polymer, the use of a rubber containing repeating units derived from olefins grafted with reactive groups as a reactive compatibilizer can be reduced, so that the rubber containing repeating units derived from olefins grafted with reactive groups is not consumed too much for stabilizing the polyethylene interface, so the rubber phase can be better stabilized and dispersed, obtaining smaller rubber particles. As the particle size decreases, the critical stress for rubber interface failure and cavitation will be higher than the shear yield stress of the matrix, so it can withstand the pressure difference of hydrogen charging and discharging without cavitation and foaming. Detailed implementation manners

[0046] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made. These all belong to the protection scope of the present invention.

[0047] The sources of the experimental raw materials used in the present invention are as follows:

[0048] PA66: EPR24, Pingdingshan Shenma, relative viscosity 2.4, melting point 264 °C;

[0049] PA1012: PA1012, Shandong Guangyin, relative viscosity 2.4, melting point 178 °C;

[0050] PA56: ECOPENT 1273Resin, Kaisai Biotechnology, melting point 254 °C, relative viscosity 2.3;

[0051] PA510: ECOPENT E-3102, Kaisai Biotechnology, melting point 214 °C, relative viscosity 2.2;

[0052] PA6: HY-2500A, Jiangsu Haiyang Chemical Fiber, relative viscosity 2.4, melting point 222 °C;

[0053] PA11: BMNO, Arkema, relative viscosity 2.4, melting point 188 °C;

[0054] PA10T: Vicnyl 700, Kingfa Science & Technology Co., Ltd., relative viscosity 2.2, melting point 316 °C;

[0055] PA6T / 66: PA6T / 66 Kingfa Science & Technology Co., Ltd., relative viscosity 2.3;

[0056] PA6T / 6I: PA6T / 6I, Kingfa Science & Technology Co., Ltd., relative viscosity 2.3;

[0057] Rubber 1: MAH-g-SEBS, MAH content 0.1 wt%, self-made;

[0058] Rubber 2: MAH-g-SEBS, MAH content 0.5 wt%, self-made;

[0059] Rubber 3: MAH-g-SEBS, MAH content 2 wt%, self-made;

[0060] Rubber 4: MAH-g-SEBS, MAH content 5 wt%, self-made;

[0061] Rubber 5: MAH-grafted butadiene-acrylonitrile rubber, MAH content 1.5 wt%, self-made;

[0062] Rubber 6: MAH-grafted ethylene-acrylic acid polymer, MAH content 1 wt%, self-made;

[0063] Rubber 7: MAH-grafted ethylene-acrylate rubber, MAH content 2.5 wt%, self-made;

[0064] Rubber 8: GMA-g-SEBS, GMA content 0.1 wt%, self-made;

[0065] Rubber 9: GMA-g-SEBS, GMA content 2 wt%, self-made;

[0066] Rubber 10: GMA-g-SEBS, GMA content 8 wt%, self-made;

[0067] Rubber 11: GMA-g-SEBS, GMA content 10 wt%, self-made;

[0068] Rubber 12: GMA-grafted butadiene-acrylonitrile rubber, GMA content 2.5 wt%, self-made;

[0069] Rubber 13: GMA-grafted ethylene-acrylic acid polymer, GMA content 4 wt%, self-made;

[0070] Rubber 14: GMA-grafted ethylene-acrylate rubber, GMA content 0.5 wt%, self-made;

[0071] Rubber 15: SEBS, also the raw material for graft modification of the above-mentioned Rubbers 1-4, 8-11, TUFTEC M1913, manufacturer Asahi Kasei;

[0072] Rubber 16: butadiene-acrylonitrile rubber, also the raw material for graft modification of the above-mentioned Rubbers 5 and 12, Perbunan N, manufacturer ARLANXEO;

[0073] Rubber 17: ethylene-acrylic acid polymer, also the raw material for graft modification of the above-mentioned Rubbers 6 and 13, Primacor 1410, manufacturer Dow Chemical;

[0074] Rubber 18: ethylene-acrylate rubber, also the raw material for graft modification of the above-mentioned Rubbers 7 and 14, Hytemp AEM, manufacturer Zeon Corporation;

[0075] High-density polyethylene A: density 0.96 g / cm 3 , melting point 133 °C, grade PE100, manufacturer Sabic;

[0076] High-density polyethylene B: density 0.95 g / cm 3 , melting point 128 °C, grade Hostalen ACP 9255, manufacturer Basel;

[0077] Medium-density polyethylene: density 0.93 g / cm 3 , melting point 125 °C, grade MPE930, manufacturer Sabic;

[0078] LDPE: density 0.925 g / cm 3 , melting point 110 °C, grade LDPE 2426H, manufacturer Sinopec;

[0079] LLDPE: density 0.917 g / cm 3 , melting point 124 °C, grade LLDPE PE2309, manufacturer ExxonMobil;

[0080] Antioxidant: 4,4'-bis(phenylisopropyl)diphenylamine, commercially available;

[0081] Lubricant: dipentaerythritol, YIHUA;

[0082] Release agent: silicone masterbatch, MB50-002.

[0083] Keto carbonyl polymers A-J: Refer to Patent CN1035120A to prepare a copolymer of carbon monoxide and an olefinic comonomer (the olefinic comonomer is in a molar ratio);

[0084]

[0085] Preparation methods of the polyamide composites in the examples and comparative examples: According to the ratio, mix each component evenly, and extrude and pelletize through a twin-screw extruder. The temperature range of the screw is 250 - 300 °C (the highest temperature of the barrel is the melting point of polyamide + 20 °C), and the rotation speed range is 450 rpm to obtain the polyamide composite material.

[0086] Each test method:

[0087] (1) Hydrogen gas barrier property: The hydrogen gas permeability coefficient test is usually carried out using a gas permeation instrument based on the steady-state or non-steady-state permeation principle. During the test, place a 4-mm-thick sample material between two isolated chambers, fill one side with high-pressure hydrogen gas (4 MPa), and keep the other side at low pressure or vacuum. In the steady-state test, by measuring the gas flow rate on the low-pressure side and combining the thickness of the sample, the gas pressure difference, and the temperature, calculate the amount of hydrogen gas permeating through the material per unit area per unit time. The permeability coefficient is expressed in mol·m / m 2 ·s·Pa. The present invention requires that the permeability coefficient is lower than 4×10 -16 mol·m / m 2 ·s·Pa.

[0088] (2) Behavior of foaming during the hydrogen gas cycling test: Inject the sample into a sample plate with a thickness of 80 mm × 10 mm × 4 mm, and set the following experimental steps according to the hydrogen gas cycling test method of GB / T 42610-2023: Cycling pressure conditions: Adjust the ambient temperature to 23 °C, in a specific pressure range of 3 MPa to 70 MPa, place the sample in a hydrogen gas environment, and perform multiple slow pressurizations (completed within 30 min) and decompression cycles (completed within 5 min), and the number of cycles is 100 times. Evaluate the performance of the sample bar. Observe the generation of bubbles: During the cycling process, closely observe whether the material shows foaming or holes, especially during the decompression process. Generally, the formation of bubbles is caused by the local pressure of hydrogen gas inside or on the surface of the material. Then, take out the sample bar and perform cryosectioning using liquid nitrogen, and use a scanning electron microscope to observe whether there are holes on the cut surface, and judge the ability to resist foaming during the hydrogen gas cycling test according to the number of holes. When the number of holes with a diameter greater than 0.5 μm and < 5 μm < 1, the grade is 1; when the number of holes ≥ 1 and < 5, the grade is 2; when the number of holes ≥ 5 and < 10, the grade is 3, which is qualified; when the number of holes ≥ 10, the grade is 5; when there are holes with a diameter ≥ 5 μm and < 50 μm, the grade is 6; when there are holes with a diameter ≥ 50 μm, the grade is 7.

[0089] (3) Infrared welding firmness evaluation: Inject the polyamide material into a spline with dimensions of 60 mm × 14 mm × 2 mm, melt both ends of the spline through infrared heating, then bring the melted ends of two splines into contact with each other, apply pressure and control the penetration depth of the contact at the melted position to be 1 - 5 mm for welding to obtain a welded spline. Then, test the tensile strength of the welding rod according to ISO527-2:2012 and observe the fracture location. If the fracture location of the welding rod is the body of the tensile strength spline, it is a body fracture, which is the best. If the fracture location of the welding rod is the infrared welding point, record the tensile strength of the welding rod when it is pulled apart, test the tensile strength of the spline, and calculate the infrared welding strength percentage = tensile strength of the welding rod / tensile strength of the tensile strength spline * 100%. When the infrared welding strength percentage > 80%, it meets the requirements.

[0090] Table 1: Weight parts of each component of the polyamide composite material in the examples and test results

[0091]

[0092]

[0093] Continued Table 1:

[0094]

[0095]

[0096] Continued Table 1:

[0097]

[0098] Continued Table 1:

[0099]

[0100]

[0101] It can be seen from Examples 5 / 10 - 22 that when the content of the preferred rubber active groups and the preferred polyolefin rubber are used, the infrared welding strength is improved, the anti - foaming performance is better, and the hydrogen gas barrier property is better.

[0102] Continued Table 1:

[0103]

[0104]

[0105] It can be seen from Examples 5 / 24 - 32 that when the content of the preferred ketone carbonyl group is used, all properties are better.

[0106] It can be seen from the above examples that the permeability coefficient of the polyamide material of the present invention is lower than 4.0×10 -16mol·m / m 2 ·s·Pa, the infrared welding strength percentage reaches over 80%, and the anti-bubbling effect reaches above level 2.

[0107] Table 2: Weight parts of each component of polyamide composite materials in Comparative Examples 1 - 7 and test results

[0108]

[0109]

[0110] It can be seen from Comparative Examples 1 - 4 that the rubber grafted without active groups has insufficient compatibility with high-density polyethylene and polyamide, resulting in poor hydrogen gas barrier property, poor anti-bubbling property during the hydrogen gas cycle test, and also affecting the infrared welding strength.

[0111] It can be seen from Comparative Examples 5 - 7 that non-high-density polyethylene has poor gas barrier property in the patent scheme, especially poor anti-bubbling property during the hydrogen gas cycle test.

[0112] Continued Table 2: Weight parts of each component of polyamide composite materials in Comparative Examples 8 - 11 and test results

[0113]

[0114]

[0115] It can be seen from Comparative Example 8 that without high-density polyethylene, it is impossible to improve the reduction of hydrogen gas barrier property caused by rubber, and the anti-bubbling property during the hydrogen gas cycle test is poor.

[0116] It can be seen from Comparative Example 9 that without the ketocarbonyl polymer, the infrared welding performance is insufficient.

[0117] It can be seen from Comparative Example 10 that if the content of the ketocarbonyl polymer is too high, it will also damage the infrared welding performance.

[0118] It can be seen from Comparative Example 11 that without high-density polyethylene and the ketocarbonyl polymer, all properties are poor.

Claims

1. A polyamide material, characterized in that: By weight, it includes the following components: Polyamide resin 59-71 parts; 3-30 parts of rubber containing repeating units derived from olefins grafted with active groups; High density polyethylene 0.5-10 parts; 5-60 parts of ketone carbonyl polymer; The ketocarbonyl polymer is selected from compounds containing ketone units in an alternating structure of repeating units derived from an olefinic comonomer and repeating units derived from carbon monoxide; The active group is selected from at least one of a maleic anhydride group and an epoxy group.

2. The polyamide material according to claim 1, characterized in that The density range of the high-density polyethylene is 0.93 g / cm 3 -0.97 g / cm 3 .

3. The polyamide material according to claim 1, characterized in that: The olefinic comonomer is selected from one or more of ethylene, propylene, butene, hexene, octene, decene, dodecene, tetradecene, hexadecene and octadecene; the ketone carbonyl content of the ketone carbonyl polymer measured by elemental analysis is 20wt%-85wt%, preferably, the ketone carbonyl content of the ketone carbonyl polymer measured by elemental analysis is 35wt%-70wt%.

4. The polyamide material according to claim 1, characterized in that: The rubber containing repeating units derived from olefins is selected from at least one of polyolefin rubbers, polyacrylonitrile rubbers containing repeating units derived from olefins, polyacrylic acid rubbers containing repeating units derived from olefins, and polyester rubbers containing repeating units derived from olefins; preferably, the rubber containing repeating units derived from olefins is selected from polyolefin rubbers.

5. The polyamide material according to claim 1, characterized in that: In the rubber grafted with maleic anhydride groups containing repeating units derived from olefins, the weight percentage of maleic anhydride groups in the rubber grafted with maleic anhydride groups is 0.1wt%-5wt%, preferably 0.5wt%-2wt%; in the rubber grafted with epoxy groups containing repeating units derived from olefins, the weight percentage of epoxy groups in the rubber grafted with epoxy groups is 0.1wt%-10wt%, preferably 2wt%-8wt%.

6. The polyamide material according to claim 4, characterized in that: The polyolefin rubber is selected from at least one of saturated polyolefin rubber and unsaturated polyolefin rubber; the saturated polyolefin rubber is selected from ethylene-octene copolymer, polyethylene rubber, polypropylene rubber, polyisobutylene rubber, ethylene-propylene rubber, linear low-density polyethylene rubber, ethylene-butylene rubber, and chlorinated polyethylene rubber; the unsaturated polyolefin rubber is selected from at least one of ethylene-propylene rubber, butadiene-styrene rubber, styrene-ethylene-butadiene-styrene block copolymer, ethylene-propylene-butadiene rubber, styrene-butadiene-styrene copolymer, and styrene-isoprene copolymer; The polyacrylonitrile rubber containing repeating units derived from olefins is selected from at least one of butadiene-acrylonitrile rubber, hydrogenated butadiene acrylonitrile rubber, acrylonitrile isoprene rubber, and acrylonitrile-butadiene-styrene copolymer; The polyacrylic rubber containing repeating units derived from olefins is selected from at least one of ethylene-acrylic acid polymers and ethylene-acrylic acid ionomers; The polyester rubber containing repeating units derived from olefins is selected from at least one of ethylene-acrylate rubber, ethylene-vinyl acetate polymer, butadiene-acrylate rubber, ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, and methacrylate-butadiene-styrene type core / shell elastomer.

7. The polyamide material according to claim 1, characterized in that: The polyamide resin is selected from at least one of aliphatic polyamide resin and semi-aromatic polyamide resin; and further comprises 0-2 parts of auxiliary agent by weight, wherein the auxiliary agent is selected from at least one of a release agent, an antioxidant and a lubricant.

8. The method for preparing the polyamide material according to any one of claims 1 to 7, characterized in that: The following steps are involved: According to the proportion, the components are evenly mixed, extruded and granulated to obtain the polyamide material.

9. Use of the polyamide material according to any one of claims 1 to 7, characterized in that: For transporting, distributing or storing hydrogen.

10. A pipeline or container for transporting, distributing or storing gas, characterized in that: A material layer comprising the polyamide material according to any one of claims 1 to 7 or the polyamide material prepared by the preparation method according to claim 8.

11. A pipeline or container for transporting, distributing or storing hydrogen, characterized in that: A material layer comprising the polyamide material according to any one of claims 1 to 7 or the polyamide material prepared by the preparation method according to claim 8.

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