Polyamide material, method for the production thereof and use thereof

Abstract

The application discloses a kind of polyamide material and its preparation method and application, polyamide material is according to weight parts, including following component: polyamide resin 54-76 parts;Active group grafts and contains the rubber of the repeating unit derived from olefin 3-30 parts;High-density polyethylene 3-12 parts;Ketone carbonyl polymer 3-10 parts;Rice bran wax metal salt 0.1-1 part;Ketone carbonyl polymer is selected from the compound containing the ketone unit of the repeating unit derived from olefinic comonomer and the repeating unit derived from carbon monoxide alternately structured one;The polyamide is the compounding of copolymerization polyamide resin and homopolymerization aliphatic polyamide resin, copolymerization polyamide resin accounts for 20-80wt% of the polyamide resin.The polyamide material of the application has the advantages that hydrogen barrier property is good, and epoxy resin adhesive bonding property is good, and the defect that polyamide stress concentration caused by epoxy resin curing process can be improved, leading to brittle failure of polyamide material in high / low temperature cycle working condition.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a polyamide material, its preparation method, and its applications. Background Technology

[0002] Improving energy density, reliability, safety, and economy are key challenges for the large-scale commercialization of fuel cell electric vehicles (FCEVs) and other hydrogen energy applications. Although some lightweight FCEVs have been promoted in a limited market, economically viable on-board hydrogen storage technology remains one of the major bottlenecks. High-pressure hydrogen storage tank liners (inner liner) typically employ single-layer or multi-layer structures. Single-layer structures often use polyamide materials and are generally required to have a thickness of no less than 4 mm to meet hydrogen barrier performance or other design requirements.

[0003] In practical composite material storage tanks, insufficient bonding strength between the lining structure and the outer reinforcing material (such as carbon fiber, glass fiber, etc.) can lead to interfacial delamination failure. When the interface between the lining and the fiber reinforcement layer is poorly bonded, stress concentration is prone to occur at the interface under hydrogen charging and discharging cycles or external loads, resulting in interlayer separation, which seriously affects the overall sealing performance and service life of the storage tank.

[0004] In Type IV hydrogen storage tanks, the interfacial compatibility and adhesion between the inner liner and the carbon fiber composite layer are key factors affecting the overall structural integrity and long-term service performance. Existing methods for improving the bonding strength between polyamide and epoxy resin generally include increasing the polarity and active functional group density of the inner liner material surface through plasma treatment, corona discharge, or chemical oxidation, thereby enhancing its wettability and chemical bonding ability with epoxy resin. However, such surface activation treatments require costly equipment and demanding processes, hindering the commercialization of hydrogen storage tanks. Summary of the Invention

[0005] This invention discloses a polyamide material with good hydrogen barrier properties and strong adhesion to epoxy resin, as well as its preparation method and application.

[0006] This invention is achieved through the following technical solution:

[0007] A polyamide material, by weight, comprises the following components:

[0008] 54-76 parts of polyamide resin;

[0009] 3-30 parts of rubber containing repeating units derived from olefins grafted with active groups;

[0010] 3-12 parts of high-density polyethylene;

[0011] 3-10 parts of ketone carbonyl polymer;

[0012] 0.1-1 part of rice bran wax metal salt;

[0013] Ketone carbonyl polymers are selected from compounds containing alternating ketone units derived from repeating units of olefin comonomers and repeating units derived from carbon monoxide;

[0014] The polyamide is a blend of copolyamide resin and homopolymer aliphatic polyamide resin, wherein the copolyamide resin accounts for 20-80 wt% of the polyamide resin; the copolyamide resin is derived from diacid units and diamine units, wherein the diacid units are selected from at least one of 1,6-adipic acid, isophthalic acid, and terephthalic acid, and the diamine units are selected from 2-methyl-pentanediamine and optionally 1,6-hexanediamine, wherein 2-methyl-pentanediamine accounts for 1-100 mol% of the diamine units.

[0015] Preferably, the copolyamide resin accounts for 35-60 wt% of the polyamide resin.

[0016] 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 is 25wt%-75wt% as determined by elemental analysis, preferably 35wt%-60wt% as determined by elemental analysis.

[0017] The elemental analysis method for determining the ketone carbonyl content of ketone carbonyl polymers is as follows:

[0018] The ketone carbonyl polymer is separated and extracted from the polyamide resin composition using a suitable solvent, which is selected from one or more of toluene, xylene, formic acid, acetic acid, methanol, n-butanol, chloroform, tetrahydrofuran, N,N-dimethylformamide, and dimethyl sulfoxide. The polyamide resin composition is dissolved or swollen to obtain a solution or precipitate of the ketone carbonyl polymer. The obtained solution or precipitate is dissolved multiple times and subjected to vacuum rotary distillation to obtain a purified ketone carbonyl polymer extract.

[0019] Ketone carbonyl polymer extracts were prepared using one or more chromatographic grade solvents selected from toluene, xylene, formic acid, acetic acid, methanol, n-butanol, chloroform, tetrahydrofuran, N,N-dimethylformamide, and dimethyl sulfoxide to prepare ketone carbonyl polymer solutions of 2 mg / ml to 10 mg / ml. After complete dissolution, the solutions were filtered, and the solutions and mobile phases were degassed by ultrasonication. The prepared solutions were then subjected to elemental analysis.

[0020] Elemental analysis can determine the proportions of carbon, oxygen, and hydrogen. Oxygen originates from carbonyl oxygen, and its measured proportion is ω. oxygenThe ketone carbonyl content of the ketone carbonyl polymer can be calculated using the following formula: ω = ω oxygen ×M CO / M O Among them, M CO The value represents the molar mass of the ketone carbonyl group, expressed in grams per mole (g / mol). CO =28.01];M O This is the numerical value of the molar mass of oxygen atoms, expressed in grams per mole (g / mol). O =15.99].

[0021] The preparation method of the ketone carbonyl polymer is described in reference to patent publication number CN1035120A.

[0022] The number-average molecular weight of the ketone carbonyl polymer of the present invention can be 10,000-300,000, and is measured using gel permeation chromatography.

[0023] The rubber grafted with the active group and 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; the active group is selected from at least one of maleic anhydride groups and epoxy groups.

[0024] In the maleic anhydride-grafted rubber containing repeating units derived from olefins, the maleic anhydride group accounts for 0.1 wt%-5 wt% of the weight of the maleic anhydride-grafted rubber.

[0025] In the epoxy group-grafted rubber containing repeating units derived from olefins, the epoxy group accounts for 0.1wt%-10wt% of the weight percentage of the epoxy group-grafted rubber.

[0026] The weight percentage of active groups in rubber containing repeating units derived from olefins grafted with active groups was determined by acid-base titration.

[0027] Methods for grafting active groups onto rubber containing repeating units derived from olefins include, but are not limited to: using processing equipment such as single-screw extruders, twin-screw extruders, and internal mixers to complete the melt grafting of rubber components; adding grafting monomers (such as maleic anhydride or glycidyl methacrylate GMA) in the molten rubber state; reacting at a temperature of 150-200℃ and a rotation speed of 200-500 rpm; controlling the concentration of reacting monomers; and selecting initiators such as dicumyl peroxide or benzoyl peroxide, with the amount not exceeding 0.3% of the total feed weight. The grafting monomers for the epoxy groups can be glycidyl methacrylate GMA, glycidyl acrylate, etc.

[0028] 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-butene rubber, and chlorinated polyethylene rubber; the unsaturated polyolefin rubber is selected from at least one of ethylene propylene diene monomer (EPDM) rubber, butadiene-styrene rubber, styrene-ethylene-butadiene-styrene block copolymer, ethylene-propylene-butadiene rubber, styrene-butadiene-styrene copolymer, and styrene-isoprene copolymer.

[0029] 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.

[0030] 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;

[0031] 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 elastomers.

[0032] The density range of the high-density polyethylene is 0.94 g / cm³. 3 -0.97g / cm 3 Measurements were performed according to ISO 1183-1:2019 standard.

[0033] The high-density polyethylene has a melting point range of 100℃ to 135℃, and the testing standard is GB / T19466.1-2004. The melt index of the high-density polyethylene has a range of 0.1 to 20 g / 10 min, and the testing standard is ISO 1133, with test conditions of 190℃ and 2.16 kg.

[0034] The copolyamide resin is selected from at least one of the following: polyhexamethylene adipamide / polyisophthaloyl-2-methyl-pentanediamine (PA66 / DI), polyhexamethylene adipamide / polyisophthaloyl-2-methyl-pentanediamine (PA66 / D6), polyisophthaloyl-2-methyl-pentanediamine / polyisophthaloyl-2-methyl-pentanediamine (PADT / DI), polyhexamethylene adipamide / polyisophthaloyl-2-methyl-pentanediamine (PA66 / DT), polyisophthaloyl-2-methyl-pentanediamine / polyisophthaloyl-2-methyl-pentanediamine (PAD6 / DI), and polyisophthaloyl-2-methyl-pentanediamine / polyisophthaloyl-2-methyl-pentanediamine (PAD6 / DT).

[0035] Preferably, the copolyamide resin is selected from at least one of poly(2-methylpentanediamine) / poly(2-methylpentanediamine) (PADT / DI), poly(2-methylpentanediamine) / poly(2-methylpentanediamine) (PAD6 / DT), and poly(2-methylpentanediamine) / poly(2-methylpentanediamine) (PAD6 / DI).

[0036] Specifically, in the polyhexamethylene adipamide / polyisophthaloyl-2-methyl-pentanediamine (PA66 / DI), the molar percentage of the polyisophthaloyl-2-methyl-pentanediamine segment is 1-60 mol%, preferably 3-40 mol%, more preferably 5-20 mol%.

[0037] Specifically, in polyhexamethylene adipamide / polyhexamethylene adipamide (PA66 / D6), the molar percentage of the polyhexamethylene adipamide segment is 1-60 mol%, preferably 5-40 mol%, and more preferably 10-30 mol%.

[0038] Specifically, in poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine) (PADT / DI), the molar percentage of the poly(2-methyl-pentanediamine) segment is 1-60 mol%, preferably 10-50 mol%, and more preferably 20-40 mol%.

[0039] Specifically, in polyhexamethylene adipamide / poly(2-methylpentanediamine) (PA66 / DT), the molar percentage of the poly(2-methylpentanediamine) segment is 1-60 mol%, preferably 3-40 mol%, and more preferably 5-20 mol%.

[0040] Specifically, in poly(2-methyl-pentanediamine adipamide) / poly(2-methyl-pentanediamine isophthalamide) (PAD6 / DI), the molar percentage of the poly(2-methyl-pentanediamine) segment is 1-60 mol%, preferably 3-40 mol%, more preferably 5-20 mol%.

[0041] Specifically, in poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine) (PAD6 / DT), the molar percentage of poly(2-methyl-pentanediamine) segments is 1-60 mol%, preferably 3-40 mol%, and more preferably 5-20 mol%.

[0042] The homopolymer aliphatic polyamide resin is derived from an aliphatic dicarboxylic acid with 4-18 carbon atoms and an aliphatic diamine with 2-16 carbon atoms, or the homopolymer aliphatic polyamide resin is derived from a lactam or amino acid; optionally, the aliphatic dicarboxylic acid with 4-18 carbon atoms is selected from at least one of succinic acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2,4,4-trimethyladipic acid, pimelic acid, octanoic acid, azelaic acid, sebacic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, and hexadecanoic acid; the aliphatic dicarboxylic acid with 2-16 carbon atoms... The aliphatic diamine of 6 is selected from ethylenediamine, 1-butyl-ethylenediamine, 1,3-propanediamine, 1,2-propanediamine, 1,3-butanediamine, 1,4-butanediamine, 1,1-dimethyl-1,4-butanediamine, 1,2-dimethyl-1,4-butanediamine, 1,3-dimethyl-1,4-butanediamine, 1,4-dimethyl-1,4-butanediamine, 2,3-dimethyl-1,4-butanediamine, 1-ethyl-1,4-butanediamine, 1,5-pentanediamine, 2-methyl-1,5-pentanediamine, 1,6-hexanediamine, 2,5-dimethyl-1,6-hexanediamine, 2,4-dimethyl-1,6-hexanediamine, 3, 3-Dimethyl-1,6-hexanediamine, 2,2-dimethyl-1,6-hexanediamine, 2,4-diethyl-1,6-hexanediamine, 2,2,4-trimethyl-1,6-hexanediamine, 1,7-heptanediamine, 2,3-dimethyl-1,7-heptanediamine, 2,4-dimethyl-1,7-heptanediamine, 2,2-dimethyl-1,7-heptanediamine, 1,8-octanediamine, 1,3-dimethyl-1,8-octanediamine, 1,4-dimethyl-1,8-octanediamine, 2,4-dimethyl-1,8-octanediamine, 3,4-dimethyl-1,8-octanediamine, 4,5-dimethyl-1,8-octanediamine, 2, The lactam or amino acid is selected from at least one of 2-dimethyl-1,8-octanediamine, 3,3-dimethyl-1,8-octanediamine, 4,4-dimethyl-1,8-octanediamine, 1,9-nonanediamine, 5-methyl-1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,15-pentadedecanediamine, and 1,16-hexadecanediamine; the lactam or amino acid is selected from at least one of β-propiolactam, γ-butyrolactam, δ-valeractam, ε-caprolactam, ω-aminoundecanoic acid, and ω-dodecanolactam.

[0043] The copolymer polyamide resin and homopolymer aliphatic polyamide resin of the present invention can be commercially available products or can be prepared in-house using conventional polyamide polymerization methods. In one embodiment, the polyamide resin can be prepared as follows: In a pressure vessel equipped with a magnetic coupling stirrer, condenser, gas inlet, feed inlet, and pressure explosion-proof port, reaction raw materials (diamine, diacid, lactam, or amino acid) are added in a specific ratio. Next, benzoic acid, sodium hypophosphite (as a catalyst), and deionized water are added. The amount of benzoic acid is 2-3% of the total mass of the above reaction raw materials, the weight of sodium hypophosphite is 0.05-0.15% of the other added materials excluding deionized water, and the weight of deionized water is 20-40% of the total added weight. Under stirring, a vacuum is first drawn, and then high-purity nitrogen is used as a protective gas to raise the temperature to 215-225°C within 1.5-2.5 hours. The reaction mixture was stirred at 215-225℃ for 0.5-2 hours, and then stirring was continued to raise the temperature of the reactants to 255-265℃. The mixture was then kept at this temperature and under a constant pressure of 2.1-2.3 MPa for 1.5-3 hours, with pressure maintained by continuously removing the generated water. After the reaction was complete, the product was discharged. The prepolymer was then vacuum-dried at 75-85℃ to obtain the prepolymer product. Subsequently, the prepolymer product was solid-phase thickened under a vacuum of 225-235℃ and 40-60 Pa for 8-12 hours to finally obtain the polyamide resin.

[0044] In one embodiment, the relative viscosity of the homopolymer aliphatic polyamide resin and the copolymer polyamide resin is 1.8-2.8. The relative viscosity test method for polyamide is as follows: Refer to GB12006.1-89, measure the relative viscosity of a 0.25 g / dl polyamide in 98% concentrated sulfuric acid at 25 ± 0.01℃.

[0045] Depending on actual needs, 0-30 parts of additives may be added. These additives are selected from at least one of the following: colorants, lubricants, light stabilizers, UV absorbers, heat stabilizers, antioxidants, flame retardants, flame retardant synergists, anti-dripping agents, flow modifiers, release agents, antistatic agents, fluorescent whitening agents, and antibacterial agents. In one embodiment, the antioxidant content may range from 0-2 parts, for example, 0.001-1 parts; the lubricant content may range from 0-2 parts, for example, 0.001-1 parts; and the colorant content may range from 0-2 parts, for example, 0.001-1 parts.

[0046] Based on the weight percentage of the polyamide material of the present invention, high-density polyethylene accounts for 4.4-11.7 wt%, ketone carbonyl polymer accounts for 3.9-8.8 wt%, and rice bran wax metal salt accounts for 0.2-0.8 wt%.

[0047] The method for preparing the polyamide material of the present invention includes the following steps: mixing the components evenly according to the formula, and extruding and granulating the mixture through a twin-screw extruder to obtain the polyamide material.

[0048] The application of the polyamide material of the present invention is used to prepare the inner liner of a hydrogen barrier tank.

[0049] The present invention also relates to a pipeline or container for transporting, distributing or storing gases, comprising a layer of material made of the polyamide material of the present invention or a polyamide material obtained by the method of the present invention.

[0050] The present invention also relates to a pipeline or container for transporting, distributing or storing hydrogen, comprising a layer of material made of the polyamide material of the present invention or a polyamide material obtained by the method of the present invention.

[0051] The present invention has the following beneficial effects:

[0052] The polyamide material of this invention has the advantages of good hydrogen barrier properties and good adhesion to epoxy resin. Furthermore, it can improve the defect of brittle fracture of the polyamide material under high / low temperature cycling conditions caused by stress concentration during the epoxy resin curing process. Specifically, the ketone carbon group provides a large number of electronegative oxygen atoms, which form hydrogen bonds with the epoxy resin, further increasing the hydrogen bond density and thus improving barrier properties. Meanwhile, the copolymer polyamide regulates crystallization, which is beneficial for the epoxy resin to penetrate the inner liner material after curing, resulting in a higher interfacial bonding strength after curing. Attached Figure Description

[0053] Figure 1 Schematic diagram of peel strength test of epoxy bonded sample. Detailed Implementation

[0054] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0055] The experimental materials used in this invention are sourced from the following sources:

[0056] The following polyamides are self-made raw materials:

[0057] PA66 / DI:

[0058] A 1 2.5 B 3 2.5 C 5 2.5 D 10 2.5 E 20 2.5 F 40 2.5 G 60 2.5

[0059] PA66 / 5I: 5I content is 10 mol%, relative viscosity is 2.4.

[0060] PA66 / D6:

[0061] A 1 2.2 B 5 2.2 C 10 2.2 D 20 2.2 E 30 2.2 F 40 2.2 G 60 2.2

[0062] PADT / DI:

[0063] A 1 2.4 B 10 2.4 C 20 2.4 D 30 2.4 E 40 2.4 F 50 2.4 G 60 2.4

[0064] PA66 / DT:

[0065] A 1 2.5 B 3 2.5 C 5 2.5 D 10 2.5 E 20 2.5 F 40 2.5 G 60 2.5

[0066] PAD6 / DI:

[0067] A 1 2.3 B 3 2.3 C 5 2.3 D 10 2.3 E 20 2.3 F 40 2.3 G 60 2.3

[0068] PAD6 / DT:

[0069] A 1 2.5 B 3 2.5 C 5 2.5 D 10 2.5 E 20 2.5 F 40 2.5 G 60 2.5

[0070] The preparation method of the above copolyamide is as follows: In a pressure vessel equipped with a magnetic coupling stirrer, condenser, gas inlet, feed inlet, and pressure explosion-proof port, the reactants (diamine and diacid) are added in proportion. Next, benzoic acid, sodium hypophosphite (as a catalyst), and deionized water are added. The amount of benzoic acid is 2% of the total mass of the diamine and diacid, the weight of sodium hypophosphite is 0.1% of the other reactants excluding deionized water, and the weight of deionized water is 30% of the total reactants. Under stirring, a vacuum is first drawn, and then high-purity nitrogen is used as a protective gas to raise the temperature to 215-225℃ over 1.5-2.5 hours. The reaction mixture is stirred at 215-225℃ for 0.5-2 hours, and then stirring continues to raise the temperature of the reactants to 255-265℃. The reaction is then carried out at a constant temperature and pressure of 2.2 MPa for 2-2.2 hours, with the pressure maintained by continuously removing the generated water. After the reaction is complete, the product is discharged. The prepolymer was vacuum dried at 80°C to obtain the prepolymer product. Then, the prepolymer product was solid-phase thickened under vacuum conditions of 225-235°C and 40-60 Pa for 8-12 hours, and the relative viscosity was controlled to finally obtain polyamide.

[0071] PA66: EPR24, Pingdingshan Shenma, relative viscosity 2.4;

[0072] PA1012: PA1012, Shandong Guangyin, relative viscosity 2.4;

[0073] PA56: ECOPENT 1273 Resin, Cathay Biotech, relative viscosity 2.3;

[0074] PA510: ECOPENT E-3102, Cathay Biotech, relative viscosity 2.2;

[0075] PA6: HY-2500A, Jiangsu Haiyang Chemical Fiber, relative viscosity 2.4;

[0076] PA11: BMNO, Arkema, relative viscosity 2.4;

[0077] PA10T: Vicnyl 700, Kingfa Science & Technology, relative viscosity 2.2;

[0078] PA6T / 66: Kingfa Science & Technology's PA6T / 66, relative viscosity 2.3, 6T content 45 mol%;

[0079] PA6T / 6I: PA6T / 6I, Kingfa Science & Technology, relative viscosity 2.3;

[0080] Rubber-1: MAH-g-SEBS, MAH content 1.6wt%, self-made;

[0081] Rubber-2: MAH-grafted butadiene-acrylonitrile rubber, MAH content 1.5wt%, self-made;

[0082] Rubber-3: MAH-grafted ethylene-acrylate rubber, MAH content 2.5wt%, self-made, modified from ethylene-acrylate rubber (Hytemp AEM, manufacturer Zeon Corporation).

[0083] Rubber-4: GMA-g-SEBS, GMA content 2wt%, FG1901GT, Kraton, USA;

[0084] Rubber-5: SEBS, is the raw material for graft modification of the above-mentioned Rubber-1, TUFTEC M1913, manufactured by Asahi Kasei.

[0085] Rubber-6: Butadiene-acrylonitrile rubber, is the raw material for graft modification of the above-mentioned Rubber-2, Perbunan N, manufactured by ARLANXEO;

[0086] High-density polyethylene A: density is 0.96 g / cm³ 3 It has a melting point of 133℃, the grade is HI1108, and the manufacturer is Lotte Chemical.

[0087] High-density polyethylene B: density is 0.95 g / cm³ 3 Melting point is 128℃, grade HE2550, manufacturer: Borealis;

[0088] Medium-density polyethylene: density is 0.93 g / cm³ 3 It has a melting point of 125°C, is grade MPE930, and is manufactured by Saudi Basic Industries Corporation (SABIC).

[0089] LDPE: density is 0.925 g / cm³ 3 It has a melting point of 110℃, is grade LDPE 2426H, and is manufactured by Sinopec.

[0090] LLDPE: Density is 0.917 g / cm³ 3 Melting point is 124℃, grade LLDPE PE2309, manufacturer ExxonMobil;

[0091] Antioxidant: 4,4'-Di(phenylisopropyl)diphenylamine, commercially available;

[0092] Lubricant: Dipentaerythritol, YIHUA;

[0093] Ketone carbonyl polymer AH: A copolymer of carbon monoxide and olefinic comonomers was prepared according to patent CN1035120A (the molar ratio of olefinic comonomers is specified).

[0094] olefin comonomers Ethylene:propylene = 1:1 Ethylene:propylene = 1:1 Ethylene:propylene = 1:1 Ethylene:propylene = 1:1 Ketone carbonyl content (wt%) 25 35 60 75 Number average molecular weight 76700 79300 75500 78400 E F G H olefin comonomers ethylene propylene Ethylene:butene = 3:1 Butene Ketone carbonyl content (wt%) 45 55 50 50 Number average molecular weight 153000 195700 13000 106000

[0095] Sodium rice bran wax: R301, Chongqing Hecai Chemical Technology;

[0096] Rice bran wax calcium salt: R502, Chongqing Hecai Chemical Technology;

[0097] Sodium lignite: LICOMONT NAV101, Clariant;

[0098] Other nucleating agent A: HTPultra 5L, imifab;

[0099] Other nucleating agent B: CHB-3C, Chenghe Technology;

[0100] Preparation method of polyamide material in the examples and comparative examples: According to the formula, the components are mixed evenly and extruded and granulated by a twin-screw extruder. The screw temperature range is 250-300℃ (the highest temperature of the screw barrel is the melting point of polyamide +20℃), and the rotation speed range is 450rpm to obtain polyamide material.

[0101] Test methods:

[0102] (1) Hydrogen barrier properties: Hydrogen permeability testing is typically performed using a gas permeameter, based on steady-state or non-steady-state permeation principles. During testing, a 4mm thick sample is placed between two isolated chambers. One chamber is filled with high-pressure hydrogen (4MPa), while the other is kept at low pressure or under vacuum. In steady-state testing, the amount of hydrogen permeating through a unit area of ​​material per unit time is calculated by measuring the gas flow rate on the low-pressure side, combined with the sample thickness, gas pressure difference, and temperature. The permeability coefficient is expressed in mol·m / m²·s·Pa. This invention requires a permeability coefficient lower than 4×10⁻⁶. -16mol·m / m²·s·Pa.

[0103] (2) Epoxy Adhesion: Polyamide material was injection molded to obtain square plate B (100mm×100mm×1.0mm) and square plate A (100mm×100mm×3.0mm). Then, a 20mm diameter circular hole was cut from the center of square plate A. Epoxy resin (model: bisphenol A type epoxy resin E51) and curing agent (diethylenetriamine) were mixed evenly at a weight ratio of 100:11 and applied evenly to one side of the horizontally placed square plate A. Square plate B was then attached to the surface of square plate A coated with the epoxy resin mixture. The mixture was placed in an oven at 80℃ for high-temperature curing for 1 hour. The resulting epoxy-bonded sample C was then removed and subjected to a peel strength test. The specific testing method is as follows: Fix square plate C suspended in the air (A facing up, B facing down). Apply pressure from top to bottom through the aforementioned circular hole using a 12mm diameter push rod with a rounded head. Then, control the push rod to move downwards at a speed of 1mm / min, guiding it to contact plate B bonded below the circular hole. The equipment begins recording force data. The push rod continues to move at a speed of 1mm / min. The bonding interface between the material and the epoxy resin mixture begins to peel off, as shown in the attached instruction manual. Figure 1 As shown. By calculating the maximum force value Fmax of the peel curve and the peel diameter Rfinal of the sample C, the peel strength is calculated using the following equation, with units of kN / m:

[0104] .

[0105] (3) Stress concentration-induced brittle fracture: Simulating the connection structure between the nozzle and inner liner of a hydrogen storage tank, an annular metal insert (outer diameter 50mm, thickness 3mm) was placed in an 80mm×120mm×3mm mold (central axis symmetrical, and the edge of the metal insert is 10mm from the end). Epoxy resin (model: bisphenol A type epoxy resin E51) was coated on the surface of the metal insert, and then the above material was injection molded into the mold and insert structure by an injection molding machine to obtain a sample containing an annular metal insert. The sample was placed in a high and low temperature environment chamber to simulate environmental conditions. The low temperature condition was set to -40℃ and the high temperature condition to 80℃. The sample was stored at -40℃ for 30min, and then quickly switched to 80℃ within 30 seconds. The sample was stored at 80℃ for 30min, and then quickly switched to -40℃ within 30 seconds, which was one cycle. The porthole was used to observe whether cracks appeared around the insert, and the number of cycles with cracks was recorded. When no cracks occurred after 20 cycles, the experiment was stopped.

[0106] Table 1: Component content and test results of polyamide materials A1-A7 in Examples

[0107] PA66 / DI designation A B C D E F G PA66 / DI content 30 30 30 30 30 30 30 PA66 30 30 30 30 30 30 30 Rubber-1 15 15 15 15 15 15 15 High-density polyethylene A 7 7 7 7 7 7 7 Ketone carbonyl polymer B 6 6 6 6 6 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0.4 0.4 0.4 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 2.39 1.67 0.78 0.83 0.93 1.28 2.01 Epoxy adhesion (kN / m) 8.6 9.8 11.9 13.0 12.5 10.6 9.4 Stress concentration triggers brittle failure (number of cycles) 17 20 20 20 20 18 15

[0108] As can be seen from Examples A1-A7, the preferred PA66 / DI resin exhibits better hydrogen barrier properties, better epoxy adhesion, and a higher number of cycles when the molar percentage of the polyisophthaloyl-2-methyl-pentanediamine segment is within the preferred range.

[0109] Table 2: Component content and test results of polyamide materials A8-A13 in Examples

[0110] PA66 / DI-D 27.5 37.5 30 30 30 30 PA66 27.5 37.5 30 30 30 30 Rubber grade -1 -1 -2 -3 -4 -1 Rubber content 3 30 15 15 15 15 High-density polyethylene A 3 12 7 7 7 7 Ketone carbonyl polymer designation B B B B B A Ketone carbonyl polymer content 3 10 6 6 6 6 Rice bran wax metal salt A 0.1 1 0.4 0.4 0.4 0.4 antioxidants 0 0.3 0.3 0.3 0.3 0.3 lubricant 0 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 1.63 0.76 1.33 1.07 0.99 2.08 Epoxy adhesion (kN / m) 11.9 12.7 13.6 12.8 13.2 11.4 Stress concentration triggers brittle failure (number of cycles) 19 20 20 20 20 18

[0111] Table 3: Component content and test results of polyamide materials A14-A20 in Examples

[0112] PA66 / DI-D 30 30 30 30 30 30 30 PA66 30 30 30 30 30 30 30 Rubber-1 15 15 15 15 15 15 15 High-density polyethylene A 7 7 7 7 7 7 High-density polyethylene B 7 Ketone carbonyl polymer designation C D E F G H B Ketone carbonyl polymer content 6 6 6 6 6 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0.4 0.4 Rice bran wax metal salt B 0.4 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 0.91 1.99 1.00 1.21 1.57 1.40 0.77 Epoxy adhesion (kN / m) 12.7 11.1 12.0 11.9 12.4 13.2 12.6 Stress concentration triggers brittle failure (number of cycles) 20 17 20 20 20 20 20

[0113] As can be seen from Examples A4 / 13-19, the hydrogen barrier properties, epoxy adhesion, and number of cycles are better when the ketone carbonyl content of the preferred ketone carbonyl polymer is higher.

[0114] Table 4: Component content and test results of polyamide materials A21-A25 in Examples

[0115] PA66 / DI-D 30 30 30 30 30 Types of homopolymer aliphatic polyamides PA1012 PA56 PA510 PA6 PA11 Homopolymer aliphatic polyamide content 30 30 30 30 30 Rubber-1 15 15 15 15 15 High-density polyethylene A 7 7 7 7 7 Ketone carbonyl polymer B 6 6 6 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0.4 antioxidants 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 1.07 0.80 0.97 1.27 1.39 Epoxy adhesion (kN / m) 12.6 12.0 12.4 11.9 12.2 Stress concentration triggers brittle failure (number of cycles) 20 20 20 20 20

[0116] Table 5: Component content and test results of comparative example A1-A7 polyamide materials

[0117] PA66 / DI-D 30 30 30 54 60 PA66 / 5I 30 PA66 30 60 6 PA10T 30 PA6T / 66 30 PA6T / 6I 30 Rubber-1 15 15 15 15 15 15 15 High-density polyethylene A 7 7 7 7 7 7 7 Ketone carbonyl polymer B 6 6 6 6 6 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0.4 0.4 0.4 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 4.6 5.7 5.0 6.4 3.7 3.1 4.0 Epoxy adhesion (kN / m) 7.7 6.9 6.0 7.3 7.8 7.6 7.1 Stress concentration triggers brittle failure (number of cycles) 13 14 10 8 5 9 7

[0118] As can be seen from Comparative Example A1, the side chain methyl group in pentanediamine is the key to the copolyamide, and PA66 / 5I cannot achieve the technical effect of PA66 / DI.

[0119] As can be seen from Comparative Examples A1-A4, PA66 / DI cannot achieve excellent hydrogen barrier properties and epoxy adhesion when compounded with other aromatic polyamides.

[0120] As can be seen from Comparative Example A5, it is impossible to obtain both excellent hydrogen barrier properties and epoxy adhesion by using commonly used aliphatic polyamides.

[0121] As can be seen from Comparative Examples A6 / 7, when the ratio of PA66 / DI to aliphatic polyamide is not within the range specified in this invention, or when pure PA66 / DI is used, it is impossible to obtain both excellent hydrogen barrier properties and epoxy adhesive properties simultaneously.

[0122] Table 6: Component content and test results of comparative example A8-A13 polyamide materials

[0123] PA66 / DI-D 30 30 30 30 30 PA66 30 30 30 30 30 Rubber grade -5 -6 -1 -1 -1 Rubber content 15 15 0 15 15 High-density polyethylene A 7 7 7 0 15 Ketone carbonyl polymer B 6 6 6 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0.4 antioxidants 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 9.8 10.6 12.8 12.8 6.5 Epoxy adhesion (kN / m) 5.7 4.9 5.4 6.7 7.5 Stress concentration triggers brittle failure (number of cycles) 5 3 1 8 10

[0124] As can be seen from Comparative Examples A8-9, the technical effect is poor when using rubber grafted with non-active groups.

[0125] As can be seen from Comparative Example A10, the technical effect is poor when the rubber does not contain grafted active groups.

[0126] As shown in A11 / 12, the technical effect is poor when there is no high-density polyethylene or the high-density polyethylene content is too high.

[0127] Table 7: Component content and test results of comparative example A13-A18 polyamide materials

[0128] PA66 / DI-D 30 30 30 30 30 30 PA66 30 30 30 30 30 30 Rubber-1 15 15 15 15 15 15 High-density polyethylene A 7 7 7 medium density polyethylene 7 LDPE 7 LLDPE 7 Ketone carbonyl polymer B 6 6 6 0 6 6 Rice bran wax metal salt A 0.4 0.4 0.4 0.4 0 2 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 11.1 13.4 17.0 5.1 3.4 3.9 Epoxy adhesion (kN / m) 5.7 6.1 4.9 3.4 11.1 13.4 Stress concentration triggers brittle failure (number of cycles) 11 8 6 7 9 11

[0129] As can be seen from Comparative Examples A13-15, the technical effect is poor when other types of polyethylene are used, especially the hydrogen barrier properties are poor.

[0130] As can be seen from Comparative Example A16, epoxy without ketone carbonyl polymers has poor adhesion and fewer cycles.

[0131] As can be seen from Comparative Examples A17 / 18, the performance is poor when rice bran wax metal salts are not present or when their content is too high, especially when the number of cycles is low.

[0132] Table 8: Component content and test results of comparative example A19-A21 polyamide materials

[0133] PA66 / DI-D 30 30 30 PA66 30 30 30 Rubber-1 15 15 15 High-density polyethylene A 7 7 7 Ketone carbonyl polymer B 6 6 6 Sodium lignite 0.4 Other nucleating agent A 0.4 Other nucleating agents B 0.4 antioxidants 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property ×10 -16 mol·m / m²·s·Pa]]> 4.7 5.2 5.0 Epoxy adhesion (kN / m) 12.3 12.7 10.0 Stress concentration triggers brittle failure (number of cycles) 7 10 9

[0134] As can be seen from Comparative Examples A19-21, when other conventional nucleating agents in the field are selected, the technical effect is similar to that of Comparative Example A17, indicating that the material is prone to brittle failure caused by stress concentration.

[0135] Table 9: Component Contents and Test Results of Polyamide Material in Example B

[0136] PA66 / D6 designation A B C D E F G PA66 / D6 content 35 35 35 35 35 35 35 PA6 30 30 30 30 30 30 30 Rubber-1 10 10 10 10 10 10 10 High-density polyethylene A 6 6 6 6 6 6 6 Ketone carbonyl polymer B 7 7 7 7 7 7 7 Rice bran wax metal salt A 0.5 0.5 0.5 0.5 0.5 0.5 0.5 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 1.90 1.44 0.80 0.77 1.08 1.34 2.29 Epoxy adhesion (kN / m) 9.1 9.7 12.0 13.4 13.0 11.2 10.6 Stress concentration triggers brittle failure (number of cycles) 19 20 20 20 20 20 17

[0137] As can be seen from Examples B1-7, the molar percentage of polyadipyl-2-methyl-pentanediamine segments in PA66 / D6 is preferably 5-40 mol; more preferably 10-30 mol.

[0138] Table 10: Component content and test results of polyamide material in Example C

[0139] PADT / DI designation A B C D E F G PADT / DI content 24 24 24 24 24 24 24 PA66 36 36 36 36 36 36 36 Rubber-1 18 18 18 18 18 18 18 High-density polyethylene A 4 4 4 4 4 4 4 Ketone carbonyl polymer B 8 8 8 8 8 8 8 Rice bran wax metal salt A 0.2 0.2 0.2 0.2 0.2 0.2 0.2 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.4 0.4 0.4 0.4 0.4 0.4 0.4 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 2.76 1.99 1.03 0.94 1.34 1.78 2.06 Epoxy adhesion (kN / m) 8.3 9.7 11.4 12.3 11.9 10.5 9.4 Stress concentration triggers brittle failure (number of cycles) 19 20 20 20 20 20 18

[0140] As can be seen from Examples C1-7, the molar percentage of poly(2-methyl-pentanediamine) in PADT / DI is preferably 10-50 mol; more preferably 20-40 mol.

[0141] Table 11: Component content and test results of polyamide material in Example D

[0142] PA66 / DT designation A B C D E F G PA66 / DT content 30 30 30 30 30 30 30 PA1012 30 30 30 30 30 30 30 Rubber-1 20 20 20 20 20 20 20 High-density polyethylene A 8 8 8 8 8 8 8 Ketone carbonyl polymer B 5 5 5 5 5 5 5 Rice bran wax metal salt A 0.7 0.7 0.7 0.7 0.7 0.7 0.7 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 0.5 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property ×10 -16 mol·m / m²·s·Pa]]> 1.66 1.18 0.57 0.69 0.84 1.39 2.00 Epoxy adhesion (kN / m) 9.1 10.7 12.0 13.4 14.2 11.8 10.1 Stress concentration triggers brittle failure (number of cycles) 20 20 20 20 20 20 20

[0143] As can be seen from Examples D1-7, the molar percentage of poly(2-methyl-pentanediamine) in PA66 / DT is preferably 3-40 mol; more preferably 5-20 mol.

[0144] Table 11: Component content and test results of polyamide material in Example E

[0145] PAD6 / DI designation A B C D E F G PAD6 / DI content 30 30 30 30 30 30 30 PA66 30 30 30 30 30 30 30 Rubber-1 13 13 13 13 13 13 13 High-density polyethylene A 7 7 7 7 7 7 7 Ketone carbonyl polymer B 7 7 7 7 7 7 7 Rice bran wax metal salt A 0.5 0.5 0.5 0.5 0.5 0.5 0.5 antioxidants 0.4 0.4 0.4 0.4 0.4 0.4 0.4 lubricant 0.4 0.4 0.4 0.4 0.4 0.4 0.4 <![CDATA[Hydrogen barrier property ×10 -16 mol·m / m²·s·Pa]]> 2.11 1.58 0.91 0.54 0.80 1.70 1.92 Epoxy adhesion (kN / m) 8.3 10.0 12.2 12.9 11.6 10.4 9.33 Stress concentration triggers brittle failure (number of cycles) 19 20 20 20 20 19 18

[0146] As can be seen from Examples E1-7, the molar percentage of poly(2-methyl-pentanediamine) in PAD6 / DI is preferably 3-40 mol; more preferably 5-20 mol.

[0147] Table 12: Component content and test results of polyamide material in Example F

[0148] PAD6 / DT label A B C D E F G PAD6 / DT content 36 36 36 36 36 36 36 PA6 24 24 24 24 24 24 24 Rubber-1 25 25 25 25 25 25 25 High-density polyethylene A 12 12 12 12 12 12 12 Ketone carbonyl polymer B 4 4 4 4 4 4 4 Rice bran wax metal salt A 0.6 0.6 0.6 0.6 0.6 0.6 0.6 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3 0.3 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <![CDATA[Hydrogen barrier property × 10 -16 mol·m / m²·s·Pa]]> 2.01 1.55 1.06 0.77 0.96 1.37 1.69 Epoxy adhesion (kN / m) 8.5 10.5 13.1 13.7 12.9 11.0 9.9 Stress concentration triggers brittle failure (number of cycles) 20 20 20 20 20 20 18

[0149] As can be seen from Examples F1-7, the molar percentage of poly(2-methyl-pentanediamine) in PAD6 / DT is preferably 3-40 mol; more preferably 5-20 mol.

Claims

1. A polyamide material, characterized in that, By weight, it includes the following components: 54-76 parts of polyamide resin; 3-30 parts of rubber containing repeating units derived from olefins grafted with active groups; 3-12 parts of high-density polyethylene; 3-10 parts of ketone carbonyl polymer; 0.1-1 part of rice bran wax metal salt; Ketone carbonyl polymers are selected from compounds containing alternating ketone units derived from repeating units of olefin comonomers and repeating units derived from carbon monoxide; The polyamide is a blend of copolyamide resin and homopolymer aliphatic polyamide resin, wherein the copolyamide resin accounts for 20-80 wt% of the polyamide resin; the copolyamide resin is derived from diacid units and diamine units, wherein the diacid units are selected from at least one of 1,6-adipic acid, isophthalic acid, and terephthalic acid, and the diamine units are selected from 2-methyl-pentanediamine and optionally 1,6-hexanediamine, wherein 2-methyl-pentanediamine accounts for 1-100 mol% of the diamine units.

2. 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 is 25wt%-75wt% as determined by elemental analysis, preferably 35wt%-60wt% as determined by elemental analysis.

3. The polyamide material according to claim 1, characterized in that, The rubber containing repeating units derived from olefins and grafted with the active group 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; the active group is selected from at least one of maleic anhydride groups and epoxy groups; in the rubber containing repeating units derived from olefins and grafted with maleic anhydride groups, the weight percentage of maleic anhydride groups in the rubber is 0.1wt%-5wt%; in the rubber containing repeating units derived from olefins and grafted with epoxy groups, the weight percentage of epoxy groups in the rubber is 0.1wt%-10wt%.

4. The polyamide material according to claim 3, characterized in that, 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 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-butene rubber, and chlorinated polyethylene rubber; the unsaturated polyolefin rubber is selected from at least one of ethylene propylene diene monomer (EPDM) rubber, butadiene-styrene rubber, styrene-ethylene-butadiene-styrene block copolymer, ethylene-propylene-butadiene rubber, styrene-butadiene-styrene copolymer, and styrene-isoprene 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 elastomers.

5. The polyamide material according to claim 1, characterized in that, The density range of the high-density polyethylene is 0.94 g / cm³. 3 -0.97 g / cm 3 .

6. The polyamide material according to claim 1, characterized in that, The copolyamide resin accounts for 35-60 wt% of the polyamide resin.

7. The polyamide material according to claim 1, characterized in that, The copolyamide resin is selected from polyhexamethylene adipamide / poly(2-methyl-pentanediamine), polyhexamethylene adipamide / poly(2-methyl-pentanediamine), poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), polyhexamethylene adipamide / poly(2-methyl-pentanediamine), poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), and poly(2-methyl-pentanediamine). At least one of poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine); preferably, the copolyamide resin is selected from at least one of poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), and poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine). In the aforementioned polyhexamethylene adipamide / polyisophthaloyl-2-methyl-pentanediamine, the molar percentage of the polyisophthaloyl-2-methyl-pentanediamine segment is 1-60 mol%, preferably 3-40 mol%, and more preferably 5-20 mol%. In polyhexamethylene adipamide / polyhexamethylene adipamide, the molar percentage of the polyhexamethylene adipamide segment is 1-60 mol%, preferably 5-40 mol%, and more preferably 10-30 mol%. In poly(2-methylpentanediamine) / poly(isophthaloyl-2-methylpentanediamine), the molar percentage of poly(2-methylpentanediamine) is 1-60 mol%, preferably 10-50 mol%, and more preferably 20-40 mol%. In polyhexamethylene adipamide / poly(2-methylpentanediamine) terephthalamide, the molar percentage of the poly(2-methylpentanediamine) segment is 1-60 mol%, preferably 3-40 mol%, more preferably 5-20 mol%. In poly(2-methylpentanediamine adipamide) / poly(2-methylpentanediamine isophthalamide), the molar percentage of the poly(2-methylpentanediamine) segment is 1-60 mol%, preferably 3-40 mol%, and more preferably 5-20 mol%. In poly(2-methyl-pentanediamine) / poly(2-methyl-pentanediamine), the molar percentage of poly(2-methyl-pentanediamine) segments is 1-60 mol%, preferably 3-40 mol%, and more preferably 5-20 mol%.

8. The polyamide material according to claim 1, characterized in that, The homopolymer aliphatic polyamide resin is derived from an aliphatic dicarboxylic acid with 4-18 carbon atoms and an aliphatic diamine with 2-16 carbon atoms, or the homopolymer aliphatic polyamide resin is derived from a lactam or amino acid with 4-18 carbon atoms; preferably, the aliphatic dicarboxylic acid with 4-18 carbon atoms is selected from at least one of succinic acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2,4,4-trimethyladipic acid, pimelic acid, octanoic acid, azelaic acid, sebacic acid, undecanoic acid, dodecacaric acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, and hexadecanoic acid; Aliphatic diamines with 2-16 carbon atoms are selected from ethylenediamine, 1-butyl-ethylenediamine, 1,3-propanediamine, 1,2-propanediamine, 1,3-butanediamine, 1,4-butanediamine, 1,1-dimethyl-1,4-butanediamine, 1,2-dimethyl-1,4-butanediamine, 1,3-dimethyl-1,4-butanediamine, 1,4-dimethyl-1,4-butanediamine, 2,3-dimethyl-1,4-butanediamine, 1-ethyl-1,4-butanediamine, 1,5-pentanediamine, 2-methyl-1,5-pentanediamine, 1,6-hexanediamine, 2,5-dimethyl-1,6-hexanediamine, and 2,4-dimethyl-1,6-hexanediamine. Diamine, 3,3-dimethyl-1,6-hexanediamine, 2,2-dimethyl-1,6-hexanediamine, 2,4-diethyl-1,6-hexanediamine, 2,2,4-trimethyl-1,6-hexanediamine, 1,7-heptanediamine, 2,3-dimethyl-1,7-heptanediamine, 2,4-dimethyl-1,7-heptanediamine, 2,2-dimethyl-1,7-heptanediamine, 1,8-octanediamine, 1,3-dimethyl-1,8-octanediamine, 1,4-dimethyl-1,8-octanediamine, 2,4-dimethyl-1,8-octanediamine, 3,4-dimethyl-1,8-octanediamine, 4,5-dimethyl-1,8-octanediamine, The lactam or amino acid is selected from at least one of 2,2-dimethyl-1,8-octanediamine, 3,3-dimethyl-1,8-octanediamine, 4,4-dimethyl-1,8-octanediamine, 1,9-nonanediamine, 5-methyl-1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,15-pentadecadecanediamine, and 1,16-hexadecanediamine; the lactam or amino acid is selected from at least one of β-propiolactam, γ-butyrolactam, δ-valeractam, ε-caprolactam, ω-aminoundecanoic acid, and ω-dodecanolactam.

9. A method for preparing the polyamide material according to any one of claims 1-8, characterized in that, The process includes the following steps: mixing the components evenly according to the formula, and granulating the mixture by extrusion through a twin-screw extruder to obtain a polyamide material.

10. The application of the polyamide material according to any one of claims 1-8, characterized in that, Used to prepare the inner liner of a hydrogen barrier can.

11. A pipeline or container for transporting, distributing, or storing gases, characterized in that, A material layer containing the polyamide material according to any one of claims 1-8 or the polyamide material prepared by the preparation method according to claim 9.

12. A pipeline or container for transporting, distributing, or storing hydrogen, characterized in that, A material layer containing the polyamide material according to any one of claims 1-9 or the polyamide material prepared by the preparation method according to claim 9.

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