Gas container and method for producing same, automatic fire extinguishing device

Abstract

The application provides a gas container, which comprises a first thermoplastic resin layer, a gas-tight layer, a first adhesive layer bonded between the first thermoplastic resin layer and the gas-tight layer, a second thermoplastic resin layer, and a second adhesive layer bonded between the gas-tight layer and the second thermoplastic resin layer. The first thermoplastic resin layer and the second thermoplastic resin layer are modified polyolefins, and the thickness of the second thermoplastic resin layer is 1-5 times the thickness of the first thermoplastic resin layer. The first adhesive layer and the second adhesive layer are high-polarity adhesives, and the high-polarity adhesives contain functional groups with a mass percentage content of 4-23%. A first intermediate layer is formed between the first thermoplastic resin layer and the first adhesive layer, and a second intermediate layer is formed between the second thermoplastic resin layer and the second adhesive layer, and the thickness of the second intermediate layer is 2-5 times the thickness of the first intermediate layer. The application also provides a preparation method of the gas container and an automatic fire extinguishing device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of containers, in particular to a gas container, a preparation method of the gas container, and an automatic fire extinguishing device using the gas container. BACKGROUND

[0002] The automatic fire extinguishing device comprises a gas container and a gas fire extinguishing agent contained in the gas container. The automatic fire extinguishing device has the advantages of wide adaptability, low maintenance cost, environmental protection and safety, and can be applied to power distribution cabinets, server cabinets, communication machine rooms, power plant control rooms, elevator control cabinets, museum artifact display cabinets, ancient book storerooms, biological laboratories, train power cabins, ship engine rooms, new energy vehicle engine compartments, lithium battery warehouses, and paint spraying workshops.

[0003] However, the existing automatic fire extinguishing device also has disadvantages, which limits the large-scale application of the automatic fire extinguishing device. For example, the burst temperature of the gas container of the automatic fire extinguishing device is difficult to accurately control, so that the automatic fire extinguishing device cannot be accurately burst, and the gas fire extinguishing agent has the risk of leakage during long-term use.

[0004] Therefore, there is an urgent need for a gas container with adjustable and controllable melting point, accurate burst, and strong airtightness, and an automatic fire extinguishing device using the gas container. SUMMARY

[0005] In view of the above defects of the prior art, the present application provides a gas container with the advantages of adjustable and controllable melting point, accurate burst, and strong airtightness.

[0006] The present application provides a kind of gas container, comprising first thermoplastic resin layer, airtight layer, the first adhesive layer bonded between first thermoplastic resin layer and airtight layer, second thermoplastic resin layer and the second adhesive layer bonded between airtight layer and second thermoplastic resin layer.The first thermoplastic resin layer is modified polyolefin, the mass percentage content of functional group in modified polyolefin is 0.5-5%;Second thermoplastic resin layer is modified polyolefin, the mass percentage content of functional group in modified polyolefin is 1-10%;The thickness of first thermoplastic resin layer is 0.5-5mm, the thickness of second thermoplastic resin layer is 0.5-10mm, the thickness of second thermoplastic resin layer is 1-5 times the thickness of first thermoplastic resin layer.The first adhesive layer and the second adhesive layer are high-polarity adhesive, the high-polarity adhesive of first adhesive layer and second adhesive layer contains functional group with mass percentage content of 4-23%;First intermediate layer is formed between first thermoplastic resin layer and first adhesive layer due to the interaction between groups, the thickness of first intermediate layer is 0.01-0.5 µm;Second intermediate layer is formed between second thermoplastic resin layer and second adhesive layer due to the interaction between groups, the thickness of second intermediate layer is 0.02-2.5 µm, the thickness of second intermediate layer is 2-5 times the thickness of first intermediate layer.

[0007] The present application also provides a kind of gas container preparation method, comprising the following steps:

[0008] Multiple extruders are provided with a composite die, the composite die has a plurality of flow channels arranged in layers;And

[0009] The raw materials corresponding to the first thermoplastic resin layer, the airtight layer, the first adhesive layer, the second thermoplastic resin layer, and the second adhesive layer are respectively processed by multiple extruders, and the products obtained after processing are transported to a composite die head, and are extruded through corresponding flow channels to form a gas container, the gas container comprising a first thermoplastic resin layer, an airtight layer, a first adhesive layer bonded between the first thermoplastic resin layer and the airtight layer, a second thermoplastic resin layer, and a second adhesive layer bonded between the airtight layer and the second thermoplastic resin layer, the first thermoplastic resin layer being a modified polyolefin, the mass percentage content of the functional groups in the modified polyolefin being 0.5-5%; the second thermoplastic resin layer being a modified polyolefin, the mass percentage content of the functional groups in the modified polyolefin being 1-10%; the thickness of the first thermoplastic resin layer being 0.5-5mm, the thickness of the second thermoplastic resin layer being 0.5-10mm, the thickness of the second thermoplastic resin layer being 1-5 times the thickness of the first thermoplastic resin layer; the first adhesive layer and the second adhesive layer being high-polarity adhesives, the high-polarity adhesives in the first adhesive layer and the second adhesive layer containing functional groups with a mass percentage content of 4-23%; a first intermediate layer being formed between the first thermoplastic resin layer and the first adhesive layer due to the interaction between the groups, the thickness of the first intermediate layer being 0.01-0.5µm; a second intermediate layer being formed between the second thermoplastic resin layer and the second adhesive layer due to the interaction between the groups, the thickness of the second intermediate layer being 0.02-2.5µm, the thickness of the second intermediate layer being 2-5 times the thickness of the first intermediate layer.

[0010] The application also provides an automatic fire extinguishing device comprising a gas container and a gas fire extinguishing agent contained in the gas container, the two ends of the gas container being hermetically sealed.

[0011] The gas container includes a first thermoplastic resin layer, a gas-tight layer, a first adhesive layer bonded between the first thermoplastic resin layer and the gas-tight layer, a second thermoplastic resin layer, and a second adhesive layer bonded between the gas-tight layer and the second thermoplastic resin layer. The first thermoplastic resin layer is a modified polyolefin, and the mass percentage content of the functional groups in the modified polyolefin is 0.5-5%. The second thermoplastic resin layer is a modified polyolefin, and the mass percentage content of the functional groups in the modified polyolefin is 1-10%. The melting point of the thermoplastic resin layer can be precisely adjusted and controlled by grafting different types and contents of functional groups on the polyolefin, so that the gas container suitable for different occasions can be made according to the needs. The first thermoplastic resin layer serves as an outer layer, and the thickness is 0.5-5 mm. The second thermoplastic resin layer serves as an inner layer, and the thickness is 0.5-10 mm. The thickness of the second thermoplastic resin layer is 1-5 times the thickness of the first thermoplastic resin layer. The first thermoplastic resin layer is close to or in contact with the heat source, and the thickness is small. When heated, the first thermoplastic resin layer can quickly soften to shorten the response time and improve the thermal response accuracy. The second thermoplastic resin layer serves as a pressure-bearing layer and directly contacts the gas fire extinguishing agent. The thickness of the second thermoplastic resin layer is set to be 1-5 times the thickness of the first thermoplastic resin layer, so that the second thermoplastic resin layer can withstand the pressure of the gas fire extinguishing agent. The second thermoplastic resin layer also serves as a thermal buffer zone. When the first thermoplastic resin layer is locally overheated and causes a false explosion, the second thermoplastic resin layer can still maintain a normal state to reduce the non-fire self-explosion rate. When the fire is heated, the first thermoplastic resin layer explodes, and the second thermoplastic resin layer has a larger thickness and generates more self-explosion energy, so that the opening has a larger aperture and can be single-point directional large-diameter blasting. This is conducive to the ejection of the gas fire extinguishing agent contained therein, improves the ejection speed of the gas fire extinguishing agent, and ensures that the gas fire extinguishing agent can be completely ejected. When the gas container is laid in a curved manner, the second thermoplastic resin layer with the thickness can also inhibit the generation of deformation and micro-cracks, thereby improving the service life of the gas container. The thickness of the first intermediate layer is 0.01-0.5 µm, and the thickness of the second intermediate layer is 0.02-2.5 µm. The thickness of the second intermediate layer is 2-5 times the thickness of the first intermediate layer. The first intermediate layer is closer to the outside, and a thinner thickness is conducive to the rapid arrival and penetration of the fire heat to the gas-tight layer, which is conducive to the softening and rupture of the gas-tight layer, thereby shortening the response time. The second intermediate layer serves as a thermal buffer zone. When the first thermoplastic resin layer is locally overheated and causes a false explosion, the second intermediate layer cooperates with the second thermoplastic resin layer to maintain a normal state and reduce the non-fire self-explosion rate. In this way, the gas container can be precisely exploded. The three-dimensional network structure of the first intermediate layer and the second intermediate layer has better compactness and can also cooperate with the gas-tight layer to prevent the leakage of the gas fire extinguishing agent. When the gas container is laid in a curved manner, the second intermediate layer with the thickness can buffer stress and inhibit the generation of micro-cracks in the second thermoplastic resin layer, thereby improving the service life of the gas container. BRIEF DESCRIPTION OF DRAWINGS

[0012] To more clearly illustrate the solutions of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an automatic fire extinguishing device according to an embodiment of the present invention.

[0014] Figure 2 yes Figure 1 The automatic fire extinguishing device shown is a cross-sectional view along line AA.

[0015] Figure 3 yes Figure 1 An exploded view of the automatic fire extinguishing system shown.

[0016] Figure 4 yes Figure 3 The diagram shows the structure of the first casing of the automatic fire extinguishing device.

[0017] Figure 5 yes Figure 3 The diagram shows a structural schematic of the first casing of the automatic fire extinguishing device from another angle.

[0018] Figure 6 yes Figure 3 The diagram shows the structure of the first adapter of the automatic fire extinguishing device.

[0019] Figure 7 yes Figure 3 A schematic diagram of the first adapter of the automatic fire extinguishing device from another angle.

[0020] Figure 8 yes Figure 3 The diagram shows the structure of the pressurization needle of the automatic fire extinguishing device.

[0021] Figure 9 yes Figure 3 A schematic diagram of the automatic fire extinguishing device's pressurization needle from another angle.

[0022] Figure 10 yes Figure 3 The diagram shows the structure of the plug of the automatic fire extinguishing device.

[0023] Figure 11 yes Figure 3 The diagram shows a structural schematic of the plug of the automatic fire extinguishing device from another angle.

[0024] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] Referring to FIG. 1, a gas container 10 according to an embodiment of the present application is shown. The gas container 10 is generally in a tubular structure and is used to store a gas fire extinguishing agent. When the ambient temperature reaches 60-110°C, the gas container 10 can quickly and effectively burst to form an opening, and the gas fire extinguishing agent in the gas container 10 can be quickly and massively ejected from the opening, so as to effectively extinguish the fire. When the gas container 10 is not filled with the gas fire extinguishing agent, the outer diameter of the gas container 10 can be 15-35mm, and the length of the gas container 10 can be 100-3600mm. Of course, the outer diameter and the length of the gas container 10 can be adjusted according to actual needs. Figure 2 The gas container 10 includes a first thermoplastic resin layer 11, a gas-tight layer 12, a first adhesive layer 13 adhered between the first thermoplastic resin layer 11 and the gas-tight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 adhered between the gas-tight layer 12 and the second thermoplastic resin layer 14.

[0027]

[0028] ​The first thermoplastic resin layer 11 is a modified polyolefin. The modified polyolefin has a functional group content of 0.5-5% by mass. The functional group content can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%. The functional group is selected from at least one of a hydroxyl group, an amino group, an ether group, a siloxane group, an acid anhydride group, a carboxylic acid group, an epoxy group, an acrylate group, and an acetate group. By adjusting the type and content of the functional group, the melting point of the first thermoplastic resin layer 11 can be controlled and adjusted. The hydroxyl group, the amino group, the ether group, the acid anhydride group, the carboxylic acid group, the acrylate group, and the acetate group can destroy the regularity of the polyolefin backbone and reduce the crystallinity of the polyolefin backbone, thereby reducing the melting point of the polyolefin. The hydrophobic property of the siloxane group can inhibit the crystallinity of the polyolefin backbone, thereby reducing the melting point of the polyolefin. The epoxy group can form a crosslinked network with the polyolefin backbone through ring-opening reaction, reduce the melting entropy, and thereby increase the melting point of the polyolefin. For example, by adjusting the type and content of the functional group, the melting point of the first thermoplastic resin layer 11 can be set to 79°C. When the ambient temperature reaches 79°C, the first thermoplastic resin layer 11 bursts to form at least one opening (not shown) on the gas container 10. The gaseous fire extinguishing agent in the gas container 10 can be quickly and massively ejected from the opening, thereby effectively extinguishing the fire. Of course, the melting point of the first thermoplastic resin layer 11 can also be set to other values, such as 68°C, 93°C, or 105°C, so that the gas container 10 can be suitable for different places.

[0029] The thickness of the first thermoplastic resin layer 11 is 0.5-5 mm. The thickness can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. Within this range, the opening can also be quickly formed by bursting at a specific temperature range.

[0030] The second thermoplastic resin layer 14 is a modified polyolefin. The modified polyolefin contains 1-10% by mass of functional groups, specifically 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, or 10%. The functional groups are selected from at least one of hydroxyl, amino, ether, siloxane, anhydride, carboxylic acid, epoxy, acrylate, and acetate groups. Hydroxyl, amino, ether, anhydride, carboxylic acid, acrylate, and acetate groups disrupt the regularity of the polyolefin backbone, reducing its crystallinity and thus lowering its melting point. The hydrophobic properties of the siloxane groups inhibit the crystallinity of the polyolefin backbone, thereby lowering its melting point. Epoxy groups can form a cross-linked network with the polyolefin backbone through ring-opening reactions, reducing the melt entropy and increasing the melting point of the polyolefin. By adjusting the type and content of functional groups, a second thermoplastic resin layer 14 with a controllable and adjustable melting point can be obtained.

[0031] The thickness of the second thermoplastic resin layer 14 is 0.5-10 mm, specifically 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm. Within this range, and within a specific temperature range, it can also rapidly self-destruct to form an opening. The thickness of the second thermoplastic resin layer 14 is 1-5 times the thickness of the first thermoplastic resin layer 11, specifically 1, 2, 3, 4, or 5 times.

[0032] The components and contents of the first thermoplastic resin layer 11 and the second thermoplastic resin layer 14 may be the same or different, and their melting points may be the same or different. However, the melting point of the first thermoplastic resin layer 11 must not be greater than the melting point of the second thermoplastic resin layer 14 to prevent the second thermoplastic resin layer 14 from spontaneously exploding if the first thermoplastic resin layer 11 accidentally explodes. Preferably, the melting point of the second thermoplastic resin layer 14 is set to be greater than the melting point of the first thermoplastic resin layer 11. Even if the first thermoplastic resin layer 11 accidentally explodes, the second thermoplastic resin layer 14 can be prevented from spontaneously exploding to a certain extent by the blocking effect of other layers (such as the airtight layer 12, the two adhesive layers, and the second thermoplastic resin layer 14) and the melting point and thickness of the second thermoplastic resin layer 14 being not less than the melting point and thickness of the first thermoplastic resin layer 11.

[0033] In one embodiment, the melting point of the second thermoplastic resin layer 14 is the same as that of the first thermoplastic resin layer 11, such as 79°C. When the ambient temperature reaches 79°C, the first thermoplastic resin layer 11 and the second thermoplastic resin layer 14 burst, and the gaseous extinguishing agent in the gas container 10 can be rapidly and in large quantities ejected from the opening, thereby effectively extinguishing the fire. In another embodiment, the melting point of the second thermoplastic resin layer 14 is 90°C, and the melting point of the first thermoplastic resin layer 11 is 79°C. When the ambient temperature reaches 79°C, the first thermoplastic resin layer 11 bursts first, and the second thermoplastic resin layer 14 subsequently bursts due to heat and / or pressure. The gaseous extinguishing agent in the gas container 10 can be rapidly and in large quantities ejected from the opening, thereby effectively extinguishing the fire.

[0034] The first adhesive layer 13 and the second adhesive layer 15 are highly polar adhesives. The thickness of the first adhesive layer 13 is 0.1-0.5 mm, specifically 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. The thickness of the second adhesive layer 15 is 0.2-2.5 mm, specifically 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, or 2.5 mm. The thickness of the second adhesive layer 15 can be 2-5 times that of the first adhesive layer 13. Within this range, the first adhesive layer 13 can stably bond the first thermoplastic resin layer 11 and the airtight layer 12, and the second adhesive layer 15 can stably bond the second thermoplastic resin layer 14 and the airtight layer 12. The high-polarity adhesives of the first adhesive layer 13 and the second adhesive layer 15 contain functional groups at a mass percentage of 4-23%. The high-polarity adhesive is selected from at least one of collagen-polyethyleneimine-tannic acid adhesive, gelatin-chitosan-sodium alginate, ε-polylysine-oxidized dextran-dopamine adhesive, and carboxymethyl lignin-aminedsorbitol. Specifically, the collagen-polyethyleneimine-tannic acid adhesive, gelatin-chitosan-sodium alginate, ε-polylysine-oxidized dextran-dopamine adhesive, and carboxymethyl lignin-aminedsorbitol all contain 2-10% hydroxyl groups, 3-8% carboxyl groups, and 1-5% amino groups at a mass percentage. In high-polarity adhesives, the specific mass percentage content of hydroxyl groups can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, or 10%; the specific mass percentage content of carboxyl groups can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, or 8%; and the specific mass percentage content of amino groups can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0035] A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13 due to the interaction between their functional groups. Specifically, the first intermediate layer 111 is formed by the combination of functional groups in the first thermoplastic resin layer 11 and functional groups in the first adhesive layer 13. The thickness of the first intermediate layer 111 is 0.01-0.5µm, specifically 0.01µm, 0.02µm, 0.03µm, 0.04µm, 0.05µm, 0.06µm, 0.07µm, 0.08µm, 0.09µm, 0.1µm, 0.2µm, 0.3µm, 0.4µm, or 0.5µm. The first intermediate layer 111 can improve the adhesive stability and fatigue resistance between the first thermoplastic resin layer 11 and the first adhesive layer 13. The three-dimensional network structure of the first intermediate layer 111 also provides a certain degree of gas leakage prevention capability.

[0036] A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15 due to the interaction between the groups. That is, the second intermediate layer 141 is formed by the combination of the groups in the second thermoplastic resin layer 14 and the groups in the second adhesive layer 15. The thickness of the second intermediate layer 141 is 0.02-2.5µm, specifically 0.02µm, 0.03µm, 0.04µm, 0.05µm, 0.06µm, 0.07µm, 0.08µm, 0.09µm, 0.1µm, 0.2µm, 0.3µm, 0.4µm, 0.5µm, 0. 6µm, 0.7µm, 0.8µm, 0.9µm, 1µm, 1.1µm, 1.2µm, 1.3µm, 1.4µm, 1.5µm, 1.6µm, 1.7µm, 1.8µm, 1.9mm, 2µm, 2.1µm, 2.2µm, 2.3µm, 2.4µm, or 2.5µm. The thickness of the second intermediate layer 141 is 2-5 times the thickness of the first intermediate layer 111, specifically 2, 3, 4, or 5 times. The second intermediate layer 141 can improve the adhesion stability and fatigue resistance between the second thermoplastic resin layer 14 and the second adhesive layer 15. The three-dimensional mesh structure of the second intermediate layer 141 can also provide a certain degree of gas leakage prevention capability.

[0037] Understandably, the thickness of the first intermediate layer 111 and the second intermediate layer 141 can be controlled by adjusting the content of functional groups in the first thermoplastic resin layer 11, the first adhesive layer 13, the second thermoplastic resin layer 14, and the second adhesive layer 15. When the content of functional groups is high, the thickness of the corresponding intermediate layer increases accordingly.

[0038] The first thermoplastic resin layer 11 also contains a melting point modifier at a mass percentage of 0.01-5%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, 2%, 2.1%, 2.3%, 2.5%, 2.7%, 2.9%, 3%, 3.1%, 3.3%, 3.5%, 3.7%, 3.9%, 4%, 4.1%, 4.3%, 4.5%, 4.7%, 4.9%, or 5%. The melting point modifier is selected from at least one of calcium carbonate, titanium dioxide, carbon black, sodium silicate, lithium silicate, and magnesium hydroxide. Calcium carbonate can interfere with the ordered arrangement of polyolefin molecular chains, leading to an increase in crystallization defects, thereby lowering the melting point of the polyolefin. Titanium dioxide and carbon black hinder the close packing of polyolefin molecular chains, reducing the size of crystalline regions and thus lowering the melting point of polyolefins. Sodium silicate and lithium silicate can disrupt the regularity of the crystalline structure of polyolefins, reducing the crystallinity of the polyolefin backbone and thus lowering the melting point of polyolefins. Magnesium hydroxide can promote polyolefin crystallization through heterogeneous nucleation, thereby increasing the melting point of polyolefins.

[0039] The first thermoplastic resin layer 11 also contains a reinforcing agent at a mass percentage of 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%. The reinforcing agent is selected from at least one of glass fiber (containing silanol groups, etc.), oxidized carbon fiber (containing carboxyl, hydroxyl, carbonyl groups, etc.), amino-modified graphene (containing amide, amino groups, etc.), and hydroxyl-modified graphene (containing hydroxyl groups, etc.). Graphene readily adsorbs hydroxyl, carboxyl, epoxy, carbonyl, amino, amide, and benzene ring groups. Oxidation treatment involves introducing hydroxyl groups onto the surface of the carbon fiber through electrochemical oxidation or nitric acid treatment. The surfaces of glass fiber, oxidized carbon fiber, and hydroxyl-modified graphene are rich in hydroxyl groups, while the surface of amino-modified graphene is rich in amino groups, resulting in good compatibility between the reinforcing agent and the modified polyolefin. Glass fiber, oxidized carbon fiber, amino-modified graphene, and hydroxyl-modified graphene have high modulus and high tensile strength, which can improve the strength of the first thermoplastic resin layer 11.

[0040] The first thermoplastic resin layer 11 also contains a toughening agent at a mass percentage of 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%. The toughening agent is selected from at least one of EPDM rubber, ethylene-butyl acrylate-glycidyl methacrylate, nano-silica, and plant fibers. The surfaces of nano-silica and plant fibers are rich in hydroxyl groups, which allows for better compatibility between nano-silica and plant fibers and modified polyolefins. The elastic phase of EPDM rubber forms an island structure through phase separation, acting as a stress concentration point in the polyolefin, absorbing impact energy through elastic deformation to improve the toughness of the first thermoplastic resin layer 11. Ethylene-butyl acrylate-glycidyl methacrylate has good flexibility and forms an elastic bridge with the polyolefin to improve the toughness of the first thermoplastic resin layer 11. The hydroxyl groups on the surface of nano-silica can bond with hydrogen bonds in polyolefins to form a rigid reinforcing network, thereby improving the toughness of the first thermoplastic resin layer 11. The rough surface of plant fibers forms a physical interlock with the polyolefin, further improving the toughness of the first thermoplastic resin layer 11.

[0041] The first thermoplastic resin layer 11 also contains an antioxidant at a mass percentage of 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%. The antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol. Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol can capture free radicals to terminate the oxidation chain reaction, thereby preventing the polyolefin from being oxidized.

[0042] The second thermoplastic resin layer 14 may also contain at least one of a melting point modifier, a reinforcing agent, a toughening agent, and an antioxidant. The melting point modifier is selected from at least one of calcium carbonate, titanium dioxide, carbon black, sodium silicate, lithium silicate, and magnesium hydroxide. The mass percentage content of the melting point modifier is 0.01-5%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, 2%, 2.1%, 2.3%, 2.5%, 2.7%, 2.9%, 3%, 3.1%, 3.3%, 3.5%, 3.7%, 3.9%, 4%, 4.1%, 4.3%, 4.5%, 4.7%, 4.9%, or 5%. The reinforcing agent is selected from at least one of glass fiber (containing silanol groups, etc.), oxidized carbon fiber (containing carboxyl, hydroxyl, carbonyl groups, etc.), amino-modified graphene (containing amide, amino groups, etc.), and hydroxyl-modified graphene (containing hydroxyl groups, etc.). The mass percentage content of the reinforcing agent is 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%. The toughening agent is selected from at least one of ethylene propylene diene monomer (EPDM) rubber, ethylene-butyl acrylate-glycidyl methacrylate, nano-silica, and plant fiber. The mass percentage content of the toughening agent is 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%. The antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol. The antioxidant content by mass percentage is 0.1-2%, specifically 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, 1%, 1.1%, 1.3%, 1.5%, 1.7%, 1.9%, or 2%.

[0043] The airtight layer 12 contains graphene with adsorbed groups selected from at least one of hydroxyl, carboxyl, epoxy, and carbonyl groups. The first adhesive layer 13 has a high group content; the hydroxyl, carboxyl, and amino groups therein can combine with the groups in the airtight layer 12 to form a three-dimensional network structure, the third intermediate layer 121. The third intermediate layer 121 improves the adhesion stability and fatigue resistance between the airtight layer 12 and the first adhesive layer 13, and also provides a certain degree of gas leakage prevention. The groups in the airtight layer 12 can combine with the groups in the second adhesive layer 15 to form a three-dimensional network structure, the fourth intermediate layer 122. The fourth intermediate layer 122 improves the adhesion stability and fatigue resistance between the second adhesive layer 15 and the airtight layer 12, and also provides a certain degree of gas leakage prevention. Thus, the gas container 10 has advantages such as strong airtightness, structural stability, and fatigue resistance.

[0044] The thickness of the third intermediate layer 121 is 0.001-0.2µm, specifically 0.001µm, 0.002µm, 0.003µm, 0.004µm, 0.005µm, 0.006µm, 0.007µm, 0.008µm, 0.009µm, 0.01µm, 0.02µm, 0.03µm, 0.04µm, 0.05µm, 0.06µm, 0.07µm, 0.08µm, 0.09µm, 0.1µm, or 0.2µm. The thickness of the fourth intermediate layer 122 is 0.002-1µm, specifically 0.002µm, 0.003µm, 0.004µm, 0.005µm, 0.006µm, 0.007µm, 0.008µm, 0.009µm, 0.01µm, 0.02µm, 0.03µm, 0.04µm, 0.05µm, 0.06µm, 0.07µm, 0.08µm, 0.09µm, 0.1µm, 0.2µm, 0.3µm, 0.4µm, 0.5µm, 0.6µm, 0.7µm, 0.8µm, 0.9µm, or 1µm. The thickness of the fourth intermediate layer 122 is 2-5 times that of the third intermediate layer 121, specifically 2, 3, 4, or 5 times. The third intermediate layer 121 is closer to the outside, and a thinner thickness facilitates the rapid arrival and penetration of fire heat into the airtight layer 12, promoting softening and cracking of the airtight layer 12, thus shortening the response time. The fourth intermediate layer 122 acts as a thermal buffer, preventing accidental explosions of the first thermoplastic resin layer 11 due to localized overheating, reducing the non-fire spontaneous explosion rate. The three-dimensional mesh structure of the third and fourth intermediate layers 121 and 122 has excellent density and can also prevent leakage of gaseous extinguishing agents. When the gas container 10 is laid in a curved manner, the fourth intermediate layer 122 of this thickness can buffer stress and inhibit the formation of microcracks in the second thermoplastic resin layer 14, improving the service life of the gas container 10.

[0045] Understandably, the thickness of the third intermediate layer 121 and the fourth intermediate layer 122 can be controlled by adjusting the content of functional groups in the airtight layer 12, the first adhesive layer 13, and the second adhesive layer 15.

[0046] In the airtight layer 12, the sum of the mass percentage content of graphene and the adsorbed groups thereon is 0.1-7%, specifically 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, or 7%. The material of the airtight layer 12 is selected from at least one of graphene-modified polyethylene naphthalate (containing naphthalene ring groups, ester groups, hydroxyl groups, carboxyl groups, etc.), graphene-modified ethylene-tetrafluoroethylene copolymer (containing methylene groups, difluoromethylene groups, etc.), and graphene-modified polytetrafluoroethylene (containing carbon-fluorine bond groups, and may also contain a small amount of trifluoromethyl and carboxyl groups, derived from the hydrolysis byproducts of the polymer persulfate initiator). In graphene-modified polyethylene naphthalate (PEG), the bicyclic conjugated system of the naphthalene ring allows for a tighter arrangement of molecular chains, stronger intermolecular forces, and the formation of a dense supramolecular structure. This reduces the gaps in gas permeation paths. The planarity of the naphthalene ring also reduces chain twisting, decreasing the free volume within the material and hindering gas molecule diffusion. In graphene-modified ethylene-tetrafluoroethylene (TEFE) copolymers, the molecular chains consist of a carbon-carbon backbone and fully fluorinated fluorine atoms. The chains are arranged in a helical twist, with fluorine atoms almost covering the entire chain surface, forming a dense "fluorine protective layer." This minimizes the free volume within the material, further hindering gas molecule diffusion. In graphene-modified TEFE, the helical structure of the molecular chains and the fluorine atom-covered surface create a low surface energy barrier, resulting in low gas permeability. Furthermore, the addition of graphene reduces the gas permeation area through a "multi-path effect," extending the diffusion path of gas molecules and further improving gas barrier performance. Thus, the airtight layer 12 can effectively prevent the gaseous fire extinguishing agent contained in the gas container 10 from overflowing or leaking, improve the gas barrier performance of the gas container 10, and has better airtightness.

[0047] The density of graphene-modified polyethylene naphthalate (PEG) is 1.36-1.45 g / cm³, specifically 1.36 g / cm³, 1.37 g / cm³, 1.38 g / cm³, 1.39 g / cm³, 1.4 g / cm³, 1.41 g / cm³, 1.42 g / cm³, 1.43 g / cm³, 1.44 g / cm³, or 1.45 g / cm³. The graphene content in the graphene-modified PEG is 0.1-7% by mass, specifically 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, or 7%. At 25°C and standard atmospheric pressure, the permeability of graphene-modified polyethylene naphthalate to gaseous fire extinguishing agents, such as nitrogen, is 1×10⁻⁶. -15 ~ 1×10 -14 mol / (m·s·Pa).

[0048] The density of graphene-modified ethylene-tetrafluoroethylene copolymer is 1.75-1.85 g / cm³, specifically 1.75 g / cm³, 1.76 g / cm³, 1.77 g / cm³, 1.78 g / cm³, 1.79 g / cm³, 1.8 g / cm³, 1.81 g / cm³, 1.82 g / cm³, 1.83 g / cm³, 1.84 g / cm³, or 1.85 g / cm³. The graphene content in the graphene-modified ethylene-tetrafluoroethylene copolymer is 0.1-5% by mass, specifically 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%. At 25°C and standard atmospheric pressure, the permeability of the graphene-modified ethylene-tetrafluoroethylene copolymer to gaseous fire extinguishing agents, such as nitrogen, is 1×10⁻⁶. -14 ~ 5×10 -13 mol / (m·s·Pa).

[0049] The density of graphene-modified polytetrafluoroethylene is 2.35-2.65 g / cm³, specifically 2.35 g / cm³, 2.37 g / cm³, 2.39 g / cm³, 2.4 g / cm³, 2.41 g / cm³, 2.43 g / cm³, 2.45 g / cm³, 2.47 g / cm³, 2.49 g / cm³, 2.5 g / cm³, 2.51 g / cm³, 2.53 g / cm³, 2.55 g / cm³, 2.57 g / cm³, 2.59 g / cm³, 2.6 g / cm³, 2.61 g / cm³, 2.63 g / cm³, or 2.65 g / cm³. In graphene-modified polytetrafluoroethylene (PTFE), the mass percentage content of graphene is 0.1-5%, specifically 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%. At 25°C and standard atmospheric pressure, the permeability of graphene-modified PTFE to gaseous fire extinguishing agents, such as nitrogen, is 5 × 10⁻⁶. -17 ~ 1×10 -16 mol / (m·s·Pa).

[0050] The airtight layer 12 can be a single-layer structure with a thickness of 0.001-0.1 mm, specifically 0.001 mm, 0.003 mm, 0.005 mm, 0.007 mm, 0.009 mm, 0.01 mm, 0.03 mm, 0.05 mm, 0.07 mm, 0.09 mm, or 0.1 mm. In another embodiment, the airtight layer 12 is a multi-layer structure with adjacent airtight layers 12 made of different materials. The thickness of each airtight layer 12 is 0.001-0.05 mm, specifically 0.001 mm, 0.003 mm, 0.005 mm, 0.007 mm, 0.009 mm, 0.01 mm, 0.03 mm, or 0.05 mm. For example, the airtight layer 12 includes a graphene-modified polyethylene naphthalate layer and a graphene-modified polytetrafluoroethylene layer, which reduces the gas permeability of the airtight layer 12 to an extremely low level.

[0051] The airtight layer 12 may also include additives selected from at least one of glass fiber (containing silanol groups, etc.), carbon fiber (containing carboxyl, hydroxyl, carbonyl groups, etc.), carbon nanotubes, nano-titanium dioxide, and nano-zinc oxide. The addition of glass fiber, carbon fiber, carbon nanotubes, nano-titanium dioxide, and nano-zinc oxide can reduce cold flow and porosity, further improving the gas barrier performance of the airtight layer 12. In the airtight layer 12, the mass percentage content of glass fiber is 0.01-0.2%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.11%, 0.13%, 0.15%, 0.17%, 0.19%, or 0.2%; the mass percentage content of carbon fiber is 0.01-0.3%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, or 0.2%. 1%, 0.11%, 0.13%, 0.15%, 0.17%, 0.19%, 0.2%, 0.21%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, or 0.3% by mass; the mass percentage content of carbon nanotubes is 0.01-0.3%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.11%, 0.13%. The percentages are 0.15%, 0.17%, 0.19%, 0.2%, 0.21%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, or 0.3%; the mass percentage content of nano-titanium dioxide is 0.01-0.25%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.11%, 0.13%, 0.15%, 0. 17%, 0.19%, 0.2%, 0.21%, 0.23%, 0.24%, or 0.25%; the mass percentage content of nano zinc oxide is 0.01-0.25%, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.09%, 0.1%, 0.11%, 0.13%, 0.15%, 0.17%, 0.19%, 0.2%, 0.21%, 0.23%, 0.24%, or 0.25%.

[0052] The present invention also provides a method for preparing a gas container, comprising the following steps:

[0053] Provide multiple extruders sharing a common compound die head, the compound die head having a plurality of stacked flow channels; and

[0054] Multiple extruders are used to process the raw materials corresponding to the first thermoplastic resin layer 11, the airtight layer 12, the first adhesive layer 13, the second thermoplastic resin layer 14, and the second adhesive layer 15, respectively. The processed products are conveyed to the composite die head and extruded through the corresponding flow channels to form a gas container 10. The gas container 10 includes the first thermoplastic resin layer 11, the airtight layer 12, the first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, the second thermoplastic resin layer 14, and the second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14.

[0055] After extrusion molding, the preparation method may further include a step of conveying the gas container 10 to an insulated box for heat preservation treatment to increase the thickness of each intermediate layer. The heat preservation treatment temperature is 30-60°C, and the time is 10-60 minutes. The specific heat preservation temperature can be 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, or 60°C. The specific heat preservation time can be 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, or 60 minutes.

[0056] The raw materials corresponding to the first thermoplastic resin layer 11 include polyolefins, functional molecules, and initiators. The polyolefins are selected from at least one of polyethylene, polypropylene, poly-1-butene, polypentene, polyolefin elastomers, metallocene polyethylene, metallocene polypropylene, metallocene poly-1-butene, and metallocene polypentene homopolymers. The functional molecules are selected from at least one of hydroxyethyl methacrylate, hydroxyethyl acrylate, polyvinyl butyral, hydroxylated carbon nanotubes, acrylamide, vinyl ether, glycidyl methacrylate, glycidyl acrylate, vinyltrimethoxysilane, vinyl silane, maleic anhydride, acrylic acid, methacrylic acid, styrene, octadecyl acrylate, octadecyl methacrylate, methyl acrylate, butyl acrylate, methyl methacrylate, vinyl acetate, ethylene-vinyl acetate copolymer, and acrylate acetate. The initiator is selected from at least one of dicumyl peroxide, benzoyl peroxide, dicumyl peroxide, azobisisobutyronitrile, dodecyl peroxide, di-tert-butyl peroxide, tert-butyl peroxide, tert-butyl peroxide ester, and dicarbonate peroxide.

[0057] In one embodiment, the polyolefin of the first thermoplastic resin layer 11 may be a low-density polyolefin with a density of 0.7-0.9 g / cm³. 3 Specifically, it can be 0.7 g / cm³. 3 0.71 g / cm 3 0.73 g / cm 3 0.75 g / cm 3 0.77 g / cm 3 0.79 g / cm3 0.8 g / cm 3 0.81 g / cm 3 0.83 g / cm 3 0.85 g / cm 3 0.87 g / cm 3 0.89 g / cm 3 or 0.9 g / cm 3 The molecular weight of low-density polyolefins is 20,000-40,000 g / mol, specifically 20,000 g / mol, 30,000 g / mol, or 40,000 g / mol. The branch density of low-density polyolefins is 15-30 branches / 1000C (i.e., 15-30 branches per 1000 main chain carbons), specifically 15 branches / 1000C, 20 branches / 1000C, 25 branches / 1000C, or 30 branches / 1000C. The grafting amount of low-density polyolefins is 1-3wt%, specifically 1wt%, 1.5wt%, 2wt%, 2.5wt%, or 3wt%.

[0058] In another embodiment, the polyolefin of the first thermoplastic resin layer 11 may be a mixture of high-density polyolefin and low-density polyolefin. In the mixture, the mass percentage content of the high-density polyolefin is 5-15%, specifically 5%, 7%, 9%, 10%, 11%, 13%, or 15%, and the mass percentage content of the low-density polyolefin is 85-95%, specifically 85%, 87%, 89%, 90%, 91%, 93%, or 95%. In this case, the density of the polyolefin may be 0.9-1.1 g / cm³. 3 Specifically, it can be 0.9 g / cm³. 3 0.91 g / cm 3 0.93 g / cm 3 0.95 g / cm 3 0.97 g / cm 3 0.99 g / cm 3 1 g / cm 3 or 1.1 g / cm 3High-density polyolefins have a molecular weight of 41,000-60,000 g / mol, specifically 41,000 g / mol, 50,000 g / mol, or 60,000 g / mol. Low-density polyolefins have a molecular weight of 20,000-40,000 g / mol, specifically 20,000 g / mol, 30,000 g / mol, or 40,000 g / mol. When functional groups are grafted onto low-density polyolefins, the branch density of the low-density polyolefin is 20-45 branches / 1000C (i.e., 20-45 branches per 1000 main chain carbons), specifically 20 branches / 1000C, 25 branches / 1000C, 30 branches / 1000C, 35 branches / 1000C, 40 branches / 1000C, or 45 branches / 1000C. The grafting amount of the low-density polyolefin is 2-4wt%, specifically 2wt%, 2 0.5wt%, 3wt%, 3.5wt%, or 4wt%; When functional groups are grafted onto high-density polyolefins, the branch density of the high-density polyolefin is 50-80 branches / 1000°C, specifically 50, 55, 60, 65, 70, 75, or 80 branches / 1000°C, and the grafting amount of the high-density polyolefin is 4-8wt%. The percentage (t%) can be 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, 7.5wt%, or 8wt%; when functional groups are grafted onto low-density polyolefins and high-density polyolefins, the branch density of the low-density polyolefin is 10-20 branches / 1000°C, specifically 10 branches / 1000°C, 15 branches / 1000°C, or 20 branches / 1000°C, and the grafting amount of the low-density polyolefin is 1-2w. The percentage (t%) can be 1 wt%, 1.5 wt%, or 2 wt%. The branch density of the high-density polyolefin is 30-50 branches / 1000°C, specifically 30, 35, 40, 45, or 50 branches / 1000°C. The grafting amount of the high-density polyolefin is 3-5 wt%, specifically 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, or 5 wt%. Understandably, the melting point of the first thermoplastic resin layer 11 is adjusted according to the type and content of the selected functional groups. For example, hydroxyl groups lower the melting point of the first thermoplastic resin 11. When hydroxyl groups are grafted onto the polyolefin, the higher the branch density and grafting amount, the lower the melting point. When the polyolefin is a low-density polyolefin with a small molecular weight, the melting point of the low-density polyolefin may be low, which also requires the addition of epoxy groups to increase the melting point of the polyolefin. Alternatively, if too many groups that lower the melting point are added, epoxy groups can be added to compensate and adjust the melting point in a comprehensive manner.

[0059] The raw materials corresponding to the first thermoplastic resin layer 11 may further include at least one of a reinforcing agent, a toughening agent, a melting point modifier, and an antioxidant. The reinforcing agent has a mass percentage content of 0.1-2% and is selected from at least one of glass fiber, oxidized carbon fiber, amino-modified graphene, and hydroxyl-modified graphene. The toughening agent has a mass percentage content of 0.1-2% and is selected from at least one of ethylene propylene diene monomer (EPDM) rubber, ethylene-butyl acrylate-glycidyl methacrylate, nano-silica, and plant fiber. The melting point modifier has a mass percentage content of 0.01-5% and is selected from at least one of calcium carbonate, titanium dioxide, carbon black, sodium silicate, lithium silicate, and magnesium hydroxide. The antioxidant has a mass percentage content of 0.1-2% and is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol.

[0060] The raw material of the second thermoplastic resin layer 14 may be the same as or different from the raw material of the first thermoplastic resin layer 11. It is understood that the raw materials corresponding to the first thermoplastic resin layer 11 and the second thermoplastic resin layer 14 are blended and modified in the corresponding extruder (preferably a twin-screw extruder); alternatively, the modified polyolefin can be obtained outside the extruder and then placed in the extruder for extrusion processing, in which case the extruder can be a single-screw extruder.

[0061] A twin-screw extruder comprises a conveying section, a plasticizing section, a dispersing and mixing section, a venting section, and a metering section. Multiple metering sections of the extruder can be connected to a compound die, allowing the product to be conveyed to the compound die. The conveying section includes a large-lead deep-groove threaded section to increase free volume, improve conveying capacity, and prevent bridging or backflow. The plasticizing section includes a threaded section with a gradually decreasing lead, providing weak shear to prevent decomposition of polyolefins or modifiers. The dispersing and mixing section features a forward and reverse stretching block mixing rotor and a toothed disc to enhance the dispersion of raw materials and promote reaction. The venting section includes a large-lead threaded section with dual vacuum vents to effectively remove low-molecular-weight volatiles (such as water, solvents, and reaction byproducts) generated during the reaction, preventing material interface weakening. The metering section features a small-lead gradual-change section design to stabilize extrusion pressure and ensure uniform molding of the modified material into tubular structures. The metering section and compound die can be cooled to rapidly reduce the temperature of the modified polyolefin. Cooling can be achieved by external water cooling of the twin-screw extruder. The principle of using a twin-screw extruder for blending modification of polyolefins is as follows: during the forward conveying of raw materials, the meshing action between the two screws shears the raw materials; under the high temperature and high shear force in the dispersion and mixing section, agglomerates are broken down, forming micro-dispersions, and physical and chemical changes occur between the raw materials, with functional groups grafted onto the polyolefin under the action of an initiator.

[0062] When using a twin-screw extruder to blend and modify polyolefins to prepare the first thermoplastic resin layer 11 and the second thermoplastic resin layer 14, the temperature of the conveying section is 150-160°C, the screw speed is 50-100 r / min, the length-to-diameter ratio is 25-35:1, the temperature of the plasticizing section is 160-180°C, the temperature of the dispersion and mixing section is 180-200°C, the screw speed is 200-350 r / min, the temperature of the venting section is 150-180°C, the vacuum degree is 0.05-0.08 MPa, the temperature of the metering section is 180-200°C, the residence time of the raw material in the dispersion and mixing section is 1-3 min, and the residence time in the venting section is no more than 1 min.

[0063] The raw material corresponding to the airtight layer 12 is selected from at least one of graphene-modified polyethylene naphthalate, graphene-modified ethylene-tetrafluoroethylene copolymer, and graphene-modified polytetrafluoroethylene. The raw material corresponding to the airtight layer 12 also includes at least one of glass fiber, carbon fiber, carbon nanotubes, nano-titanium dioxide, and nano-zinc oxide. Specifically, in the airtight layer, the mass percentage content of glass fiber is 0.01-0.2%; the mass percentage content of carbon fiber is 0.01-0.3%; the mass percentage content of carbon nanotubes is 0.01-0.3%; the mass percentage content of nano-titanium dioxide is 0.01-0.25%; and the mass percentage content of nano-zinc oxide is 0.01-0.25%.

[0064] The raw material corresponding to the airtight layer 12 can be placed into a single-screw extruder for processing. The single-screw extruder includes a feeding section, a compression section, and a metering section. The screw channel in the feeding section is relatively deep and is used for preheating, preliminary compaction, and conveying the raw material. The screw channel depth in the compression section gradually decreases and is used for melting and mixing the raw material. The metering section ensures uniform plasticization of the melt and quantitatively delivers it to the composite die. The temperature in the conveying section is 160-180°C, the screw speed is 50-80 r / min, and the length-to-diameter ratio is 15-30:1. The temperature in the compression section is 180-250°C, and the screw speed is 150-350 r / min. The temperature in the metering section is 180-220°C, and the residence time of the raw material in the venting section is no more than 1 minute. Understandably, specific temperatures and other parameters are set depending on the selected raw material. Understandably, when the airtight layer 12 has a multi-layer structure, the raw materials of different airtight layers 12 can be transported to the corresponding extruders for processing according to the number of film layers of the airtight layer 12.

[0065] The raw materials corresponding to the first adhesive layer 13 and the second adhesive layer 15 may be high-polarity adhesives, selected from at least one of collagen-polyethyleneimine-tannic acid adhesives, gelatin-chitosan-sodium alginate, ε-polylysine-oxidized dextran-dopamine adhesives, and carboxymethyl lignin-amidated sorbitol. The raw materials corresponding to the first adhesive layer 13 and the second adhesive layer 15 may be different or the same. The raw materials corresponding to the first adhesive layer 13 / second adhesive layer 15 may be placed in a single-screw extruder for processing.

[0066] The raw materials corresponding to the first thermoplastic resin layer 11, the airtight layer 12, the first adhesive layer 13, the second thermoplastic resin layer 14, and the second adhesive layer 15 may be placed in corresponding extruders, and the products obtained after being processed by the extruders may be transported to a composite die head for shaping to produce the gas container 10.

[0067] See Figures 1-11This invention also provides an automatic fire extinguishing device 100, comprising a gas container 10 and a gaseous fire extinguishing agent (not shown) contained within the gas container 10. The gas container 10 is sealed at both ends to prevent the gaseous fire extinguishing agent from overflowing. When the ambient temperature reaches 60-110°C, the gas container 10 can rapidly and effectively burst, forming an opening. The gaseous fire extinguishing agent inside the gas container 10 can then be rapidly and massively ejected from the opening, effectively extinguishing the fire. The automatic fire extinguishing device 100 is suitable for various applications, such as power distribution cabinets, server cabinets, communication equipment rooms, power plant control rooms, elevator control cabinets, museum artifact display cases, ancient book warehouses, biological laboratories, train power compartments, ship engine rooms, new energy vehicle engine compartments, lithium battery warehouses, paint spraying workshops, etc. It can be installed in an S-shaped or U-shaped pattern to achieve precise fire detection. The gaseous fire extinguishing agent can be an inert gas fire extinguishing agent or a chemical gas fire extinguishing agent, etc. Inert gas extinguishing agents can be mixtures of nitrogen, argon, and carbon dioxide, or nitrogen alone, or carbon dioxide alone. Chemical gas extinguishing agents can be heptafluoropropane, hexafluoropropane, or perfluorohexanone, etc. This invention preferably uses chemical gas extinguishing agents, and more preferably perfluorohexanone. The automatic fire extinguishing device 100 also includes a first housing 20, a first adapter 30, a pressurizing needle 40, a plug 50, a second housing 60, and a second adapter 70. The first housing 20 is generally cylindrical and is fitted onto one end of the gas container 10. The first housing 20 has a through hole 21, and the inner wall of the first housing 20 also has a protruding step 22. The first adapter 30 includes a threaded section 31 and a connecting section 32. The first adapter 30 also includes a through hole 33 penetrating the threaded section 31 and the connecting section 32. The threaded section 31 can pass through the through hole 21 of the first housing 20 and extend into the gas container 10 to connect with it. The threaded section 31 has a receiving groove 311, in which a sealing ring 312 can be accommodated to ensure a sealed connection between the threaded section 31 and the inner wall of the gas container 10. The end face of the connecting section 32 can rest on the step 22 to prevent the first adapter 30 from fully extending into the gas container 10. The connecting section 32 has a receiving groove 321, the inner wall of which has threads 322, and the outer wall of the plug 50 has threads 51. Through the interaction between the threads 322 and 51, the plug 50 can be rotatably accommodated in the receiving groove 321. The top of the plug 50 may also have an operating groove 52, through which a tool can be inserted to operate the plug 50 to connect or separate the plug 50 from the connecting section 32. The pressurizing needle 40 includes a first connecting portion 41, a second connecting portion 42, and a threaded portion 43 located between the first connecting portion 41 and the second connecting portion 42. The needle tip 411 at the end of the first connecting portion 41 can pass through the through hole 33 of the first adapter 30 and extend into the gas container 10. The external thread 431 of the threaded portion 43 can be threadedly connected to the internal thread 331 of the through hole 33 to stably connect the pressurizing needle 40 to the first adapter 30.The second connecting part 42 can be accommodated in the receiving hole 54 of the plug 50, connecting the pressurizing needle 40 to the plug 50. When the gas container 10 is heated and bursts, the internal pressure drops sharply. At this time, the pressurizing needle 40 in the first adapter 30 will move or pop out of the first adapter 30 under the action of the pressure difference to release the gaseous fire extinguishing agent.

[0068] Example 1

[0069] The gas container 10 of Embodiment 1 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0070] The first thermoplastic resin layer 11 has a thickness of 1 mm, a melting point of 89°C, and comprises polyethylene with a molecular weight of 30,000 g / mol. The main chain is grafted with hydroxyl groups at a grafting amount of 1.2 wt%, and the branching density is 15 branches / 1000°C. The second thermoplastic resin layer 14 has a thickness of 1 mm, a melting point of 89°C, and comprises polyethylene with a molecular weight of 30,000 g / mol. The main chain is grafted with hydroxyl groups at a grafting amount of 1.2 wt%, and the branching density is 15 branches / 1000°C. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.015 mm and a density of 1.75 g / cm³. 3 The graphene and the adsorbed groups on it contain 0.5% by mass. The first adhesive layer 13 has a thickness of 0.2 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 2% by mass of hydroxyl groups, 3% by mass of carboxyl groups, and 1% by mass of amino groups. The second adhesive layer 15 has a thickness of 1 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 10% by mass of hydroxyl groups, 4% by mass of carboxyl groups, and 2% by mass of amino groups. The first intermediate layer 111 has a thickness of 0.07 µm, the second intermediate layer 141 has a thickness of 0.35 µm, the third intermediate layer 121 has a thickness of 0.1 µm, and the fourth intermediate layer 122 has a thickness of 0.4 µm.

[0071] The gas container 10 of Example 1 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the temperature and time at which the gas container 10 ruptured. The gas container 10 of Example 1 spontaneously exploded approximately 21 minutes after being placed in the heating device, when the temperature inside the device reached 89°C. The permeability of the airtight layer 12 to nitrogen was 1×10⁻⁶. - 14 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0072] Example 2

[0073] The gas container 10 of Embodiment 2 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0074] The first thermoplastic resin layer 11 has a thickness of 4 mm and a melting point of 89°C. It comprises polyethylene with a molecular weight of 35,000 g / mol, with hydroxyl groups grafted onto the main chain at a grafting amount of 1.3 wt%, and a branch density of 20 branches / 1000°C. The first thermoplastic resin layer 11 also contains 0.3% by weight of oxidized carbon fiber, 0.1% by weight of oxidized nano-silica, and 0.3% by weight of sodium silicate. The second thermoplastic resin layer 14 has a thickness of 4 mm and a melting point of 90°C. It comprises polyethylene with a molecular weight of 35,000 g / mol, with hydroxyl groups grafted onto the main chain at a grafting amount of 1 wt%, and a branch density of 20 branches / 1000°C. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.01 mm and a density of 1.75 g / cm³. 3The graphene and the adsorbed groups on it contain 0.6% by mass. The first adhesive layer 13 has a thickness of 0.3 mm and is made of carboxymethyl lignin-amined sorbitol, containing 2% by mass of hydroxyl groups, 4% by mass of carboxyl groups, and 1% by mass of amino groups. The second adhesive layer 15 has a thickness of 1 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 3% by mass of hydroxyl groups, 5% by mass of carboxyl groups, and 1% by mass of amino groups. The first intermediate layer 111 has a thickness of 0.03 µm, the second intermediate layer 141 has a thickness of 0.1 µm, the third intermediate layer 121 has a thickness of 0.02 µm, and the fourth intermediate layer 122 has a thickness of 0.1 µm.

[0075] The gas container 10 of Example 2 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the temperature and time at which the gas container 10 ruptured. Approximately 21 minutes after being placed in the heating device, the gas container 10 spontaneously exploded when the temperature inside the heating device reached 89°C. The permeability of the airtight layer 12 to nitrogen was 1.2 × 10⁻⁶. - 14 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0076] Example 3

[0077] The gas container 10 of Embodiment 3 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0078] The first thermoplastic resin layer 11 has a thickness of 2 mm and a melting point of 78°C. It comprises polyethylene with a molecular weight of 20,000 g / mol, and the main chain is grafted with ether groups and amino groups at a grafting amount of 2 wt%, with a branch density of 30 branches / 1000°C. The first thermoplastic resin layer 11 also contains 0.2% calcium carbonate and 0.2% titanium dioxide by mass. The second thermoplastic resin layer 14 has a thickness of 4 mm and a melting point of 80°C. It comprises polyethylene with a molecular weight of 21,000 g / mol, and the main chain is grafted with ether groups and amino groups at a grafting amount of 2 wt%, with a branch density of 30 branches / 1000°C. The airtight layer 12 is made of graphene-modified polyethylene naphthalate, with a thickness of 0.03 mm and a density of 1.36 g / cm³. 3 The graphene and the adsorbed groups on it have a mass percentage content of 7%. The first adhesive layer 13 has a thickness of 0.4 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 2% hydroxyl groups, 4% carboxyl groups, and 1% amino groups by mass percentage. The second adhesive layer 15 has a thickness of 2 mm and is made of carboxymethyl lignin-amined sorbitol, containing 4.5% hydroxyl groups, 8% carboxyl groups, and 4% amino groups by mass percentage. The first intermediate layer 111 has a thickness of 0.3 µm, the second intermediate layer 141 has a thickness of 1.2 µm, the third intermediate layer 121 has a thickness of 0.2 µm, and the fourth intermediate layer 122 has a thickness of 1 µm.

[0079] The gas container 10 of Example 3 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the rupture temperature and time of the gas container 10. The gas container 10 of Example 3 spontaneously exploded approximately 22 minutes after being placed in the heating device, when the temperature inside the heating device reached 78°C. The permeability of the airtight layer 12 to nitrogen was 1×10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0080] Example 4

[0081] The gas container 10 of Embodiment 4 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0082] The first thermoplastic resin layer 11 has a thickness of 1 mm and a melting point of 85°C. It comprises low-density polyethylene (LDPE) with a molecular weight of 30,000 g / mol and high-density polyethylene (HDPE) with a molecular weight of 41,000 g / mol. The LDPE main chain is grafted with hydroxyl groups at a grafting amount of 2 wt%, and the branching density is 25 branches / 1000°C. The HDPE has no grafted groups. In the mixture of LDPE and HDPE, the mass percentage content of LDPE is 90%, and the mass percentage content of HDPE is 10%. The second thermoplastic resin layer 14 has a thickness of 5 mm and a melting point of 85°C. It comprises low-density polyethylene (LDPE) with a molecular weight of 30,000 g / mol and HDPE with a molecular weight of 41,000 g / mol. The LDPE main chain is grafted with hydroxyl groups at a grafting amount of 2 wt%, and the branching density is 25 branches / 1000°C. The HDPE has no grafted groups. The mixture is composed of low-density polyethylene (LDPE) and high-density polyethylene (HDPE), with LPE comprising 90% by mass and HDPE comprising 10% by mass. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.05 mm and a density of 1.75 g / cm³. 3 The graphene and its adsorbed groups comprise 0.6% by mass. The hermetically sealed layer 12 also contains 0.01% carbon nanotubes by mass. The first adhesive layer 13 has a thickness of 0.5 mm and is made of carboxymethyl lignin-amined sorbitol, containing 2% hydroxyl groups, 5% carboxyl groups, and 3% amino groups by mass. The second adhesive layer 15 has a thickness of 2.5 mm and is also made of carboxymethyl lignin-amined sorbitol, containing 4.5% hydroxyl groups, 6.5% carboxyl groups, and 4% amino groups by mass. The first intermediate layer 111 has a thickness of 0.5 µm, the second intermediate layer 141 has a thickness of 1.3 µm, the third intermediate layer 121 has a thickness of 0.03 µm, and the fourth intermediate layer 122 has a thickness of 0.15 µm.

[0083] The gas container 10 of Example 4 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the temperature and time at which the gas container 10 ruptured. The gas container 10 of Example 4 spontaneously exploded approximately 22 minutes after being placed in the heating device, when the temperature inside the device reached 85°C. The permeability of the airtight layer 12 to nitrogen was 5 × 10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0084] Example 5

[0085] The gas container 10 of Embodiment 5 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0086] The first thermoplastic resin layer 11 has a thickness of 2 mm and a melting point of 83°C. It comprises low-density polyethylene (LDPE) with a molecular weight of 30,000 g / mol and high-density polyethylene (HDPE) with a molecular weight of 41,000 g / mol. The LPE main chain is grafted with hydroxyl groups at a grafting amount of 1.5 wt%, and the branching density is 15 branches / 1000°C. The HDPE main chain is also grafted with hydroxyl groups at a grafting amount of 3 wt%, and the branching density is 35 branches / 1000°C. In the mixture of LPE and HDPE, the mass percentage content of LPE is 92%, and the mass percentage content of HDPE is 8%. The second thermoplastic resin layer 14 has a thickness of 6 mm and a melting point of 89°C. It comprises polyethylene with a molecular weight of 30,000 g / mol, with hydroxyl groups grafted onto the main chain at a grafting amount of 1.2 wt%, and a branch density of 15 branches / 1000°C. The second thermoplastic resin layer 14 also contains 0.1% (by weight) amino-modified graphene. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.02 mm and a density of 1.75 g / cm³. 3The graphene and its adsorbed groups comprise 0.6% by mass. The hermetically sealed layer 12 also contains 0.01% carbon nanotubes by mass. The first adhesive layer 13 has a thickness of 0.5 mm and is made of ε-polylysine-oxidized dextran-dopamine adhesive, containing 4% hydroxyl groups, 5% carboxyl groups, and 3% amino groups by mass. The second adhesive layer 15 has a thickness of 2.5 mm and is also made of ε-polylysine-oxidized dextran-dopamine adhesive, containing 4.5% hydroxyl groups, 6.5% carboxyl groups, and 4% amino groups by mass. The first intermediate layer 111 has a thickness of 0.2 µm, the second intermediate layer 141 has a thickness of 1 µm, the third intermediate layer 121 has a thickness of 0.04 µm, and the fourth intermediate layer 122 has a thickness of 0.2 µm.

[0087] The gas container 10 of Example 5 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the rupture temperature and time of the gas container 10. The gas container 10 of Example 5 exploded spontaneously approximately 18 minutes after being placed in the heating device, when the temperature inside the heating device reached 83°C. The permeability of the airtight layer 12 to nitrogen was 3 × 10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0088] Example 6

[0089] The gas container 10 of Embodiment 6 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0090] The first thermoplastic resin layer 11 and the second thermoplastic resin layer 14 are 1 mm thick and have a melting point of 96°C. They consist of low-density polyethylene (LDPE) with a molecular weight of 30,000 g / mol and high-density polyethylene (HDPE) with a molecular weight of 41,000 g / mol. The HDPE main chain is grafted with hydroxyl groups at a grafting amount of 8 wt%, and the branch density is 80 branches / 100°C. The grafted HDPE can be prepared in advance, and then the grafted HDPE and LPE can be mixed. In the mixture of LPE and HDPE, the mass percentage content of LPE is 95%, and the mass percentage content of HDPE is 5%. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.015 mm and a density of 1.75 g / cm³. 3 The graphene and the adsorbed groups on it contain 0.9% by mass. The first adhesive layer 13 has a thickness of 0.2 mm and is made of gelatin-chitosan-sodium alginate, containing 2.5% hydroxyl groups, 3.2% carboxyl groups, and 4% amino groups by mass. The second adhesive layer 15 has a thickness of 0.5 mm and is made of gelatin-chitosan-sodium alginate, containing 3.5% hydroxyl groups, 3.5% carboxyl groups, and 5% amino groups by mass. The first intermediate layer 111 has a thickness of 0.3 µm, the second intermediate layer 141 has a thickness of 1.5 µm, the third intermediate layer 121 has a thickness of 0.1 µm, and the fourth intermediate layer 122 has a thickness of 0.2 µm.

[0091] The gas container 10 of Example 6 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the rupture temperature and time of the gas container 10. The gas container 10 of Example 6 exploded spontaneously approximately 20 minutes after being placed in the heating device, when the temperature inside the device reached 96°C. The permeability of the airtight layer 12 to nitrogen was 3 × 10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0092] Example 7

[0093] The gas container 10 of Embodiment 7 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0094] The first thermoplastic resin layer 11 has a thickness of 1 mm and a melting point of 79°C. It comprises polyethylene with a molecular weight of 20,000 g / mol, and its main chain is grafted with epoxy groups and acrylate groups at a grafting amount of 1 wt%, with a branch density of 15 branches / 1000°C. The second thermoplastic resin layer 14 has a thickness of 3 mm and a melting point of 89°C. It comprises polyethylene with a molecular weight of 30,000 g / mol, and its main chain is grafted with hydroxyl groups at a grafting amount of 1.2 wt%, with a branch density of 15 branches / 1000°C. The second thermoplastic resin layer 14 also contains 0.1% by weight of amino-modified graphene, 0.1% by weight of amino-modified EPDM rubber, and 0.1% by weight of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.015 mm and a density of 1.78 g / cm³. 3 The graphene and its adsorbed groups comprise 0.5% by mass. The airtight layer 12 also contains 0.01% glass fiber and 0.05% carbon fiber by mass. The first adhesive layer 13 has a thickness of 0.2 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 2% hydroxyl groups, 3% carboxyl groups, and 2% amino groups by mass. The second adhesive layer 15 has a thickness of 0.5 mm and is also made of collagen-polyethyleneimine-tannic acid adhesive, containing 2% hydroxyl groups, 3% carboxyl groups, and 2% amino groups by mass. The first intermediate layer 111 has a thickness of 0.02 µm, the second intermediate layer 141 has a thickness of 0.1 µm, the third intermediate layer 121 has a thickness of 0.008 µm, and the fourth intermediate layer 122 has a thickness of 0.01 µm.

[0095] The gas container 10 of Example 7 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the temperature and time at which the gas container 10 ruptured. The gas container 10 of Example 7 spontaneously exploded approximately 21 minutes after being placed in the heating device, when the temperature inside the device reached 79°C. The permeability of the airtight layer 12 to nitrogen was 2 × 10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0096] Example 8

[0097] The gas container 10 of Embodiment 8 includes a first thermoplastic resin layer 11, an airtight layer 12, a first adhesive layer 13 bonded between the first thermoplastic resin layer 11 and the airtight layer 12, a second thermoplastic resin layer 14, and a second adhesive layer 15 bonded between the airtight layer 12 and the second thermoplastic resin layer 14. A first intermediate layer 111 is formed between the first thermoplastic resin layer 11 and the first adhesive layer 13. A second intermediate layer 141 is formed between the second thermoplastic resin layer 14 and the second adhesive layer 15. A third intermediate layer 121 is formed between the airtight layer 12 and the first adhesive layer 13. A fourth intermediate layer 122 is formed between the airtight layer 12 and the second adhesive layer 15.

[0098] The first thermoplastic resin layer 11 has a thickness of 1 mm and a melting point of 76°C. It comprises polyethylene with a molecular weight of 20,000 g / mol, and the main chain is grafted with carboxylic acid groups and epoxy groups at a grafting amount of 1.5 wt%, with a branch density of 20 branches / 1000°C. The second thermoplastic resin layer 14 has a thickness of 2 mm and a melting point of 82°C. It comprises polyethylene with a molecular weight of 30,000 g / mol, and the main chain is grafted with hydroxyl groups at a grafting amount of 1.2 wt%, with a branch density of 15 branches / 1000°C. The second thermoplastic resin layer 14 also contains 2% calcium carbonate by mass percentage. The airtight layer 12 is made of graphene-modified ethylene-tetrafluoroethylene copolymer, with a thickness of 0.012 mm and a density of 1.75 g / cm³. 3The graphene and its adsorbed groups comprise 7% by mass. The airtight layer 12 also contains 0.02% carbon nanotubes, 0.02% nano-titanium dioxide, and 0.02% nano-zinc oxide by mass. The first adhesive layer 13 has a thickness of 0.1 mm and is made of collagen-polyethyleneimine-tannic acid adhesive, containing 2% hydroxyl groups, 3% carboxyl groups, and 2% amino groups by mass. The second adhesive layer 15 has a thickness of 0.25 mm and is also made of collagen-polyethyleneimine-tannic acid adhesive, containing 3% hydroxyl groups, 3.5% carboxyl groups, and 4% amino groups by mass. The thickness of the first intermediate layer 111 is 0.4µm, the thickness of the second intermediate layer 141 is 1.3µm, the thickness of the third intermediate layer 121 is 0.18µm, and the thickness of the fourth intermediate layer 122 is 0.8µm.

[0099] The gas container 10 of Example 8 was placed inside a heating device, and the temperature was increased from 24°C to 3°C / min to determine the rupture temperature and time of the gas container 10. The gas container 10 of Example 8 spontaneously exploded approximately 24 minutes after being placed in the heating device, when the temperature inside the heating device reached 76°C. The permeability of the airtight layer 12 to nitrogen was 3 × 10⁻⁶. - 15 The value of mol / (m·s·Pa) indicates that the gas container 10 has a better leak-proof effect.

[0100] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the content of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A gas container, characterized in that, The gas container includes a first thermoplastic resin layer, an airtight layer, a first adhesive layer bonded between the first thermoplastic resin layer and the airtight layer, a second thermoplastic resin layer, and a second adhesive layer bonded between the airtight layer and the second thermoplastic resin layer, wherein... The first thermoplastic resin layer is a modified polyolefin, wherein the functional groups in the modified polyolefin have a mass percentage content of 0.5-5%; the second thermoplastic resin layer is a modified polyolefin, wherein the functional groups in the modified polyolefin have a mass percentage content of 1-10%; the thickness of the first thermoplastic resin layer is 0.5-5 mm, the thickness of the second thermoplastic resin layer is 0.5-10 mm, and the thickness of the second thermoplastic resin layer is 1-5 times the thickness of the first thermoplastic resin layer; and The first adhesive layer and the second adhesive layer are highly polar adhesives, and the highly polar adhesives in the first adhesive layer and the second adhesive layer contain functional groups with a mass percentage content of 4-23%; a first intermediate layer is formed between the first thermoplastic resin layer and the first adhesive layer due to the interaction between the groups, and the thickness of the first intermediate layer is 0.01-0.5µm; a second intermediate layer is formed between the second thermoplastic resin layer and the second adhesive layer due to the interaction between the groups, and the thickness of the second intermediate layer is 0.02-2.5µm, and the thickness of the second intermediate layer is 2-5 times the thickness of the first intermediate layer; The first thermoplastic resin layer and the second thermoplastic resin layer further contain a melting point modifier with a mass percentage content of 0.01-5%, wherein the melting point modifier is selected from at least one of calcium carbonate, titanium dioxide, carbon black, sodium silicate, lithium silicate, and magnesium hydroxide. The first thermoplastic resin layer and the second thermoplastic resin layer further contain a toughening agent with a mass percentage content of 0.1-2%, wherein the toughening agent is selected from at least one of ethylene propylene diene monomer (EPDM) rubber, ethylene-butyl acrylate-glycidyl methacrylate, nano silica, and plant fiber. The first thermoplastic resin layer and the second thermoplastic resin layer further contain a reinforcing agent with a mass percentage content of 0.1-2%, wherein the reinforcing agent is selected from at least one of glass fiber, oxidized carbon fiber, amino-modified graphene, and hydroxyl-modified graphene. The first and second thermoplastic resin layers further contain 0.1-2% by weight of an antioxidant, wherein the antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol.

2. The gas container according to claim 1, characterized in that, The melting point of the first thermoplastic resin layer is not greater than the melting point of the second thermoplastic resin layer.

3. The gas container according to claim 1, characterized in that, The highly polar adhesives of the first adhesive layer and the second adhesive layer are selected from at least one of collagen-polyethyleneimine-tannic acid adhesive, gelatin-chitosan-sodium alginate, ε-polylysine-oxidized dextran-dopamine adhesive, and carboxymethyl lignin-amined sorbitol.

4. The gas container according to claim 1, characterized in that, The highly polar adhesives of the first and second adhesive layers contain 2-10% by mass of hydroxyl groups, 3-8% by mass of carboxyl groups, and 1-5% by mass of amino groups.

5. The gas container according to claim 1, characterized in that, The functional groups in the modified polyolefin of the first thermoplastic resin layer and the second thermoplastic resin layer are selected from at least one of hydroxyl, amino, ether, siloxane, anhydride, carboxylic acid, epoxy, acrylate, and acetate groups.

6. The gas container according to claim 1, characterized in that, The material of the airtight layer is selected from at least one of graphene-modified polyethylene naphthalate, graphene-modified ethylene-tetrafluoroethylene copolymer, and graphene-modified polytetrafluoroethylene. The graphene is adsorbed with groups, which are selected from at least one of hydroxyl, carboxyl, epoxy, and carbonyl groups. The mass percentage content of graphene and the adsorbed groups in the airtight layer is 0.1-7%.

7. The gas container according to claim 6, characterized in that, A third intermediate layer is formed between the airtight layer and the first adhesive layer due to the interaction between the groups, and the thickness of the third intermediate layer is 0.001-0.2µm; a fourth intermediate layer is formed between the airtight layer and the second adhesive layer due to the interaction between the groups, and the thickness of the fourth intermediate layer is 0.002-1µm, and the thickness of the fourth intermediate layer is 2-5 times the thickness of the third intermediate layer.

8. A method for preparing a gas container as described in any one of claims 1-7, characterized in that, The method for preparing the gas container includes the following steps: Provide multiple extruders sharing a common compound die head, the compound die head having a plurality of stacked flow channels; and The multiple extruders are used to process the raw materials corresponding to the first thermoplastic resin layer, the airtight layer, the first adhesive layer, the second thermoplastic resin layer, and the second adhesive layer, respectively. The processed products are conveyed to the composite die head and extruded through corresponding flow channels to form a gas container. The gas container includes the first thermoplastic resin layer, the airtight layer, a first adhesive layer bonded between the first thermoplastic resin layer and the airtight layer, a second thermoplastic resin layer, and a second adhesive layer bonded between the airtight layer and the second thermoplastic resin layer. The first thermoplastic resin layer is a modified polyolefin, wherein the functional groups in the modified polyolefin have a mass percentage content of 0.5-5%; the second thermoplastic resin layer is a modified polyolefin, wherein the functional groups in the modified polyolefin have a mass percentage content of 1-10%; the thickness of the first thermoplastic resin layer is 0.5-5 mm, the thickness of the second thermoplastic resin layer is 0.5-10 mm, and the thickness of the second thermoplastic resin layer is 1-5 times the thickness of the first thermoplastic resin layer; The first adhesive layer and the second adhesive layer are high-polarity adhesives. The high-polarity adhesives of the first adhesive layer and the second adhesive layer contain 4-23% functional groups by mass percentage. A first intermediate layer is formed between the first thermoplastic resin layer and the first adhesive layer due to the interaction between the groups. The thickness of the first intermediate layer is 0.01-0.5µm. A second intermediate layer is formed between the second thermoplastic resin layer and the second adhesive layer due to the interaction between the groups. The thickness of the second intermediate layer is 0.02-2.5µm. The thickness of the second intermediate layer is greater than the thickness of the first intermediate layer.

9. An automatic fire extinguishing device, characterized in that, The automatic fire extinguishing device includes a gas container as described in any one of claims 1-7 and a gaseous fire extinguishing agent contained in the gas container, wherein the two ends of the gas container are sealed.

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