Composite thermal insulation for cryogenic substance cargo tanks and cryogenic substance cargo tank comprising same

Abstract

Provided are a composite thermal insulation material for a cryogenic substance cargo hold, which has improved thermal insulation and strength, and a cryogenic substance cargo hold including the same, the composite thermal insulation material including a novel vacuum thermal insulation material and a rigid polyurethane foam.

Description

Technical Field

[0001] This invention relates to composite insulation materials for cryogenic cargo holds and cryogenic cargo holds comprising the same. More specifically, it relates to composite insulation materials for cryogenic cargo holds with improved insulation and strength, and cryogenic cargo holds comprising the same. Background Technology

[0002] Recently, hydrogen energy has garnered significant attention worldwide as an alternative energy source. This is because, with fossil fuels facing depletion, addressing environmental problems caused by global warming and securing alternative energy resources have become crucial issues. Hydrogen boasts the highest energy density per unit mass, and its abundance on Earth is second only to carbon and nitrogen, particularly abundant in water, making it inexhaustible. Furthermore, it possesses the environmentally friendly characteristic of not emitting harmful substances during combustion, thus being considered an ideal energy source from an environmental pollution perspective. Especially now, with the reduction of carbon dioxide emissions related to global warming becoming a major issue, hydrogen energy has attracted considerable attention as a core component.

[0003] The most important technology for the effective utilization of hydrogen energy is hydrogen storage. Hydrogen has a high energy density per unit mass but a low energy density per unit volume. For effective storage, liquefaction is an economical and practical solution.

[0004] The design of cargo holds for applicable ships is broadly divided into membrane tanks and freestanding IMO Type A, B, and C tanks. Compared to freestanding IMO tanks, membrane tanks are more advantageous for transporting bulk cargo and are more suitable for large-scale transport of liquid hydrogen. However, to expand the market penetration of liquid hydrogen and reduce supply costs, the application of membrane tanks is necessary; however, the development of insulation materials for membrane tanks that are optimally insulated for liquid hydrogen has not been entirely satisfactory.

[0005] Currently, liquid hydrogen storage technology mainly utilizes existing insulation materials used in liquefied natural gas (LNG) storage and transportation, or modifies them for utilization. However, liquid hydrogen is an extremely cryogenic fluid with a boiling point lower than LNG (-253°C), and its boil-off rate (BOR) is approximately 10 times higher than that of LNG. Therefore, higher-performance insulation technology is required than existing technologies. While vacuum insulated panels (VIPs) are used to address this high-performance insulation, in extremely low-temperature environments, techniques are still needed to effectively suppress thermal bridging and thermal radiation at the joints between VIPs. This technology can reduce the evaporation rate and minimize the energy loss of liquid hydrogen.

[0006] Therefore, developing composite insulation materials with excellent thermal insulation properties is essential to improve the storage and transportation efficiency of liquid hydrogen. Not only for hydrogen, such high-performance composite insulation materials can also be used in the storage and transportation of various cryogenic fluids such as liquid helium, liquid nitrogen, and liquid methane, thus their application potential is very high.

[0007] Existing technical documents Patent documents Korean Patent No. 10-2310112. Summary of the Invention

[0008] The purpose of this invention is to provide a novel composite insulation material for cryogenic cargo holds that has high thermal insulation properties and strength, capable of storing and transporting cryogenic substances.

[0009] The purpose of this invention is to provide a cryogenic cargo hold containing the aforementioned novel composite thermal insulation material.

[0010] One embodiment of the present invention provides a composite thermal insulation material for cryogenic cargo compartments, comprising: a vacuum insulation material; and rigid polyurethane foam encapsulating the surface of the vacuum insulation material. The vacuum insulation material comprises: a core material; an absorbent material; and an outer covering material encapsulating the core material and the absorbent material.

[0011] The outer packaging material can be composed of a film, a metal barrier layer, and an adhesive layer stacked together.

[0012] The film may contain at least one of polyvinylidene chloride (PVDC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), ethylene-vinyl alcohol copolymer (EVOH), and nylon.

[0013] The metal barrier layer may include at least one of aluminum foil, silver foil, and copper foil.

[0014] The thickness of the metal barrier layer can be from 3 μm to 10 μm.

[0015] The adhesive layer may comprise at least one of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), unstretched polypropylene (CPP), and ethylene-vinyl alcohol copolymer (EVOH).

[0016] The core material may include at least one of microporous materials, fiber-based materials, porous composite materials, special composite materials, and amorphous materials.

[0017] The adsorbent material may include at least one of the following: metal oxide-based adsorbent material, metal-based adsorbent material, porous material, carbon-based adsorbent material, hygroscopic agent, desiccant, and gas-specific adsorbent material.

[0018] The density of the rigid polyurethane foam can be 70 kg / m³. 3 Up to 350kg / m 3 Its compressive strength at room temperature can be 1.0 MPa to 8 MPa, and its compressive strength at extremely low temperatures of -160℃±5℃ can be 2.5 MPa to 23 MPa. Its thermal conductivity at room temperature can be 20 mW / mK to 25 mW / mK, and its thermal conductivity at extremely low temperatures of -160℃±5℃ can be 10 mW / mK to 18 mW / mK.

[0019] The composite thermal insulation material has a compressive strength of 1.0 MPa to 8 MPa at room temperature, a compressive strength of 2.5 MPa to 23 MPa at extremely low temperatures of -160℃±5℃, and a thermal conductivity of less than 15 mW / mK at room temperature.

[0020] Another embodiment of the present invention provides a cryogenic cargo hold comprising the aforementioned composite insulation material.

[0021] The cryogenic substance can be at least one of liquid hydrogen, liquid nitrogen, liquid helium, and liquefied natural gas.

[0022] The composite thermal insulation material for cryogenic cargo holds in this invention uses novel vacuum insulation materials and rigid polyurethane foam to effectively block heat inflow, and has the advantage of improving compressive strength even without increasing the insulation volume.

[0023] The composite insulation material for cryogenic cargo holds according to embodiments of the present invention enhances structural stability by compositing the internal structure, minimizing deformation caused by external impacts or pressures. Furthermore, it offers the advantage of providing improved insulation performance even without significantly increasing the insulation thickness.

[0024] Furthermore, a cryogenic cargo hold incorporating a composite insulation material according to an embodiment of the present invention can achieve a highly practical storage and transportation environment for cryogenic fluids by simultaneously ensuring insulation performance and strength. Attached Figure Description

[0025] Figure 1 This is a simplified cross-sectional view of a composite thermal insulation material for cryogenic cargo holds according to an embodiment of the present invention.

[0026] Figure 2 and Figure 3 This is a simplified cross-sectional view of a composite insulation material for a cryogenic cargo hold, which includes multiple vacuum insulation materials according to an embodiment of the present invention.

[0027] Figure 4 A simplified cross-sectional view of a vacuum insulation material.

[0028] Figure 5 This is a simplified cross-sectional view of the outer packaging material.

[0029] Figure 6 A simplified cross-sectional view of a ship equipped with a cryogenic cargo hold according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures 1: Composite thermal insulation material; 2: Sealed wall; 3: Anchoring structure; 4: Inner wall; 5: Partition; 6: Outer wall; 7: Cargo hold; 10: Vacuum insulation materials; 11: Core material; 12: Adsorbent materials; 13: Outsourced materials; 13-1: Film; 13-2: Metal barrier layer; 13-3: Adhesive layer; 20: Rigid polyurethane foam. Detailed Implementation

[0031] The terms “comprising” and similar expressions used in this specification should be interpreted as open-ended terms that imply the possibility of including other technical features.

[0032] As used in this specification, "as an example," "as an embodiment," and "preferred" refer to an embodiment of the invention that can provide the specified advantages under specified conditions, and are not intended to exclude other embodiments from the scope of the invention.

[0033] Figure 1 This is a simplified cross-sectional view of a composite thermal insulation material 1 for a cryogenic cargo hold according to an embodiment of the present invention.

[0034] Reference Figure 1 According to one embodiment of the present invention, the composite thermal insulation material 1 for a cryogenic cargo compartment may include a vacuum thermal insulation material 10 and a rigid polyurethane foam 20 covering the surface of the vacuum thermal insulation material 10.

[0035] As an example, the composite thermal insulation material 1 for cryogenic cargo compartments in one embodiment of the present invention may include a plurality of vacuum thermal insulation materials 10 and rigid polyurethane foam 20 encapsulating the plurality of vacuum thermal insulation materials 10.

[0036] Figure 2 and Figure 3This is a simplified cross-sectional view of a composite insulation material 1 for a cryogenic cargo hold, which includes a plurality of vacuum insulation materials 10 according to an embodiment of the present invention.

[0037] As an example, refer to Figure 2 In one embodiment of the present invention, the composite thermal insulation material 1 for a cryogenic cargo hold can be in the form of a structure in which rigid polyurethane foam 20 encapsulates multiple layers of vacuum thermal insulation material 10.

[0038] As an example, refer to Figure 3 In one embodiment of the present invention, the composite thermal insulation material 1 for a cryogenic cargo hold can be a structure in which a rigid polyurethane foam 20 is wrapped around a vacuum insulation material 10 and the wrapped structure is stacked.

[0039] Figure 4 This is a simplified cross-sectional view of the vacuum insulation material 10.

[0040] Reference Figure 4 The vacuum insulation material 10 may include a core material 11, an adsorbent material 12, and an outer packaging material 13 that wraps the core material 11 and the adsorbent material 12.

[0041] As an example, the core material 11 is an internal core insulation structure that serves to block heat conduction from the outside. The core material 11 is formed to contain no air or gas, effectively suppressing heat conduction in a vacuum state to prevent heat from flowing into the insulation material. Therefore, the core material 11 plays a crucial role in determining the overall insulation performance of the vacuum insulation material 10.

[0042] As an example, the core material 11 may include at least one of microporous materials, fiber-based materials, porous composite materials, special composite materials and amorphous materials, but is not limited thereto.

[0043] As a preferred example, the microporous material may include at least one of microporous silica, aerogel, ceramic powder, and activated carbon-based nanomaterials, but is not limited thereto.

[0044] As a preferred example, the fiber-based material may include at least one of glass fiber, mineral wool, carbon fiber, ceramic fiber and aramid fiber, but is not limited thereto.

[0045] As a preferred example, the porous composite material may include at least one of perlite, vermiculite, polymer-based porous structures, silica gel, and metal foam, but is not limited thereto.

[0046] As a preferred example, the special composite material may include at least one of aluminum-silicon composite, nano-ceramic composite, metal foam, thermally insulating polymer / ceramic hybrid material and carbon nanotube composite material, but is not limited thereto.

[0047] As a preferred example, the amorphous material may include at least one of amorphous silicon dioxide, amorphous carbon, amorphous metal, amorphous oxide and amorphous polymer, but is not limited thereto.

[0048] As an example, the adsorbent material 12 is located inside the core material 11, and plays a role in maintaining a vacuum state for a long time by adsorbing specific gases and impurities such as moisture, oxygen, and carbon dioxide that will be generated inside over time.

[0049] As an example, the adsorbent material 12 may include at least one of metal oxide-based adsorbent materials, metal-based adsorbent materials, porous materials, carbon-based adsorbent materials, hygroscopic agents, desiccants, and gas-specific adsorbent materials, but is not limited thereto.

[0050] As a preferred example, the metal oxide-based adsorbent material may include at least one of magnesium oxide (MgO), aluminum oxide (Al2O3), titanium dioxide (TiO2), and iron oxide (Fe2O3), but is not limited thereto.

[0051] As a preferred example, the metal-based adsorbent material may contain at least one of an active metal (sodium, lithium, potassium) and a metal hydride (titanium hydride, magnesium hydride), but is not limited thereto.

[0052] As a preferred example, the porous material may include at least one of mesoporous silica, metal-organic frameworks (MOFs), zeolite and silica gel, but is not limited thereto.

[0053] As a preferred example, the carbon-based adsorbent material may include at least one of activated carbon, carbon nanotubes, graphene oxide, carbon aerogel, and activated carbon fiber, but is not limited thereto.

[0054] As a preferred example, the hygroscopic agent and desiccant may include at least one of calcium sulfate (CaSO4), calcium chloride (CaCl), calcium oxide (CaO), silica gel, lithium bromide (LiBr), magnesium perchlorate (Mg(ClO4)2), and zeolite, but are not limited thereto.

[0055] As a preferred example, the gas-specific adsorbent material may include one or more of the following: getter materials (barium, strontium, zirconium-based compounds), active metal oxides (vanadium oxide, molybdenum oxide), metal-organic frameworks, zeolites, activated carbon, carbon nanotubes, and metal hydrides (titanium hydride, magnesium hydride), but is not limited thereto.

[0056] As an example, the outer packaging material 13 ensures the durability of the vacuum insulation material 10 and acts as a protective film for protection from the external environment.

[0057] Figure 5 This is a simplified cross-sectional view of the outer packaging material 13.

[0058] As an example, refer to Figure 3 The outer packaging material 13 can form a multilayer structure comprising a thin film 13-1, a metal barrier layer 13-2, and an adhesive layer 13-3.

[0059] The thin film 13-1, as the outermost layer of the outer packaging material 13, is located at the upper end of the metal barrier layer 13-2. While protecting the core material 11 and the adsorbent material 12 from the external environment, it also prevents cracks that may occur when the inner metal barrier layer 13-2 comes into contact with or deforms. Furthermore, the thin film 13-1 functions as a gas barrier, blocking gases and impurities such as moisture, carbon dioxide, and oxygen.

[0060] As an example, the film 13-1 may contain at least one of polyvinylidene chloride, polyethylene, polypropylene, polyethylene terephthalate, ethylene-vinyl alcohol copolymer and nylon, but is not limited thereto.

[0061] The metal barrier layer 13-2 is located at the lower end of the film 13-1. It serves as a layer to block gas and moisture and protect the core material 11 and the adsorbent material 12, and plays the role of blocking external radiant heat.

[0062] As an example, the thickness of the metal barrier layer 13-2 can be 3μm or more, 4μm or more, or 5μm, or less than 10μm, 9μm or less, or less than 8μm. When these ranges are met, an optimal balance can be maintained between gas and moisture barrier function and mechanical stability.

[0063] As an example, the metal barrier layer 13-2 may include at least one of aluminum foil, silver foil and copper foil, but is not limited thereto.

[0064] The adhesive layer 13-3 is located at the lower end of the metal barrier layer 13-2. It is heat-sealed to ensure the airtightness of the outer packaging material 13 and to provide the function of maintaining a vacuum state.

[0065] As an example, the adhesive layer 13-3 may comprise at least one of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, unstretched polypropylene, and ethylene-vinyl alcohol copolymer, but is not limited thereto.

[0066] The rigid polyurethane foam 20 enhances the thermal insulation performance of the composite thermal insulation material 1 and the strength of the vacuum thermal insulation material 10.

[0067] In this specification, rigid polyurethane foam 20 refers to a foamed plastic with a closed-cell structure, produced by reacting polyol with isocyanate. Furthermore, the closed-cell structure refers to a state in which the air bubbles (pores) inside the foamed plastic or foamed material are not interconnected and are independently sealed.

[0068] As an example, the density of the rigid polyurethane foam 20, measured at room temperature (23℃±2℃) and relative humidity of 50%±5%, can be 70 kg / m³. 3 Above, 80kg / m 3 Above, 90kg / m 3 Above, 100kg / m 3 Above, 110kg / m 3 Above, 120kg / m 3 Above, 130kg / m 3 Above, 140kg / m 3 Above or 150kg / m 3 The above can be 350kg / m 3 Below, 340kg / m 3 Below, 330kg / m 3 Below, 320kg / m 3 Below, 310kg / m 3 Below or 300kg / m 3 The following, when the aforementioned range is met, can improve thermal insulation performance, structural stability, lightweight, durability and water resistance, ease of processing, and absorption of vibration and shock.

[0069] As an example, the density of the rigid polyurethane foam 20 can be adjusted to a variety of ranges depending on the vacuum insulation material 10 used.

[0070] As an example, the compressive strength of the rigid polyurethane foam 20, measured under conditions of ambient temperature (23℃±2℃), relative humidity of 50%±5%, and a loading rate of 1~10mm / min, can be 1.0MPa or higher, 1.2MPa or higher, 1.4MPa or higher, 1.6MPa or higher, 1.8MPa or higher, or 2.0MPa or higher, and can be below 8MPa, below 7.8MPa, below 7.6MPa, below 7.4MPa, below 7.2MPa, or below 7.0MPa. While meeting these ranges, it provides excellent thermal insulation performance and structural stability. In particular, it maintains its physical properties even in extremely low temperature environments, maintains strong durability under external pressure and impact, and minimizes energy loss through its thermal insulation effect.

[0071] As an example, the compressive strength of the rigid polyurethane foam 20, measured under extremely low temperatures of -160℃±5℃ and loading rates of 1~10mm / min, can be above 2.5MPa, above 2.7MPa, above 2.9MPa, above 3.1MPa, above 3.3MPa, or 3.5MPa, and below 23MPa, below 22.8MPa, below 22.6MPa, below 22.4MPa, below 22.2MPa, or below 22.0MPa. Meeting these ranges provides excellent thermal insulation performance and structural stability, minimizes energy loss through insulation, and enhances safety by preventing gas leakage.

[0072] As an example, the thermal conductivity of the rigid polyurethane foam 20, measured at room temperature (23℃±2℃) and relative humidity of 50%±5%, can be above 20 mW / mK, above 20.2 mW / mK, above 20.4 mW / mK, above 20.6 mW / mK, above 20.8 mW / mK, or above 21.0 mW / mK, and below 25 mW / mK, below 24.8 mW / mK, below 24.6 mW / mK, below 24.4 mW / mK, below 24.2 mW / mK, or below 24.0 mW / mK. When meeting the above ranges, it can also exhibit excellent thermal insulation performance in extremely low temperature environments. Due to its low thermal conductivity, excellent thermal insulation performance can be ensured even with a thin thickness.

[0073] As an example, the thermal conductivity of the rigid polyurethane foam 20, measured under extremely low temperature conditions of -160℃±5℃, can be above 10 mW / mK, above 10.2 mW / mK, above 10.4 mW / mK, above 10.6 mW / mK, above 10.8 mW / mK, or above 11 mW / mK, and below 18 mW / mK, below 17.8 mW / mK, below 17.6 mW / mK, below 17.4 mW / mK, below 17.2 mW / mK, or below 17.0 mW / mK. While meeting these ranges, excellent thermal insulation performance and structural stability are provided.

[0074] As an example, the compressive strength of the composite thermal insulation material 1, measured under conditions of ambient temperature (23℃±2℃), relative humidity of 50%±5%, and a loading rate of 1~10mm / min, can be 1.0MPa or higher, 1.2MPa or higher, 1.4MPa or higher, 1.6MPa or higher, 1.8MPa or higher, or 2.0MPa or higher, and can be below 8MPa, below 7.8MPa, below 7.6MPa, below 7.4MPa, below 7.2MPa, or below 7.0MPa. While meeting the aforementioned ranges, it provides excellent thermal insulation performance and structural stability. In particular, it maintains its physical properties even in extremely low temperature environments, maintains strong durability under external pressure and impact, and minimizes energy loss through its thermal insulation effect.

[0075] As an example, the compressive strength of the composite thermal insulation material 1, measured under extremely low temperatures of -160℃±5℃ and loading rates of 1~10mm / min, can be above 2.5MPa, above 2.7MPa, above 2.9MPa, above 3.1MPa, above 3.3MPa, or 3.5MPa, and below 23MPa, below 22.8MPa, below 22.6MPa, below 22.4MPa, below 22.2MPa, or below 22.0MPa. When meeting these ranges, excellent thermal insulation performance and structural stability can be provided, energy loss can be minimized through the thermal insulation effect, and safety can be enhanced by preventing gas leakage.

[0076] As an example, the thermal conductivity of the composite insulation material 1, measured at room temperature (23℃±2℃) and relative humidity of 50%±5%, can be below 15 mW / mK, below 14.8 mW / mK, below 14.6 mW / mK, below 14.4 mW / mK, below 14.2 mW / mK, or below 14.0 mW / mK. When these ranges are met, excellent thermal insulation performance can be maintained even in extremely low temperature environments. Due to the low thermal conductivity, excellent thermal insulation performance can be ensured even with a thin thickness.

[0077] In another embodiment of the present invention, the cryogenic cargo compartment includes the aforementioned composite thermal insulation material 1.

[0078] Figure 6 A simplified cross-sectional view of a ship equipped with a cryogenic cargo hold according to an embodiment of the present invention.

[0079] Reference Figure 6 The ship equipped with the cryogenic cargo hold of the present invention can have a hull with a double-layer structure formed by an outer wall 6 forming the shape and an inner wall 4 formed inside the outer wall 6.

[0080] Furthermore, the interior of the hull, that is, the interior of the inner wall 4, can be used as cargo holds 7 for loading cryogenic materials by dividing each interior space by one or more partitions 5.

[0081] The inner wall of the cargo hold 7 is sealed in a liquid-tight state by a sealing wall 2. That is, the sealing wall 2 is formed by welding multiple membranes together to form a storage space, thereby allowing the cargo hold 7 to store and transport cryogenic substances without leakage.

[0082] As a preferred example, the sealing wall 2 may include a primary sealing wall and a secondary sealing wall, and can be fixed to the inner wall 4 of the cryogenic cargo hold by the anchoring structure 3.

[0083] As a preferred example, the composite thermal insulation material 1 can be located between the sealing wall 2 and the inner wall 4.

[0084] As a preferred example, the composite thermal insulation material 1 can be used as the sealing wall 2.

[0085] As an example, the interior of the composite insulation material 1 or the sealed wall 2 may contain at least one of liquid hydrogen, liquid nitrogen, liquid helium and liquefied natural gas.

[0086] The present invention has been described in detail with reference to the proposed embodiments. However, those skilled in the art to which this invention pertains can implement various modifications and variations of the invention without departing from the technical spirit of the invention. The present invention is not limited to these modifications and variations, but is only subject to the scope of the claims.

Claims

1. A composite thermal insulation material for cryogenic cargo holds, characterized in that, Include: Vacuum insulation materials; and Rigid polyurethane foam is used to wrap the surface of the vacuum insulation material. The vacuum insulation material comprises: core material; Adsorbent materials; and The outer packaging material encapsulates the core material and the adsorbent material.

2. The composite thermal insulation material for cryogenic cargo holds according to claim 1, characterized in that, The outer packaging material is composed of a film, a metal barrier layer, and an adhesive layer stacked together.

3. The composite thermal insulation material for cryogenic cargo holds according to claim 2, characterized in that, The film comprises at least one of polyvinylidene chloride, polyethylene, polypropylene, polyethylene terephthalate, ethylene-vinyl alcohol copolymer, and nylon.

4. The composite thermal insulation material for cryogenic cargo holds according to claim 2, characterized in that, The metal barrier layer comprises at least one of aluminum foil, silver foil, and copper foil.

5. The composite thermal insulation material for cryogenic cargo holds according to claim 2, characterized in that, The thickness of the metal barrier layer is 3 μm to 10 μm.

6. The composite thermal insulation material for cryogenic cargo holds according to claim 2, characterized in that, The adhesive layer comprises at least one of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, unstretched polypropylene, and ethylene-vinyl alcohol copolymer.

7. The composite thermal insulation material for cryogenic cargo holds according to claim 1, characterized in that, The core material comprises at least one of microporous materials, fiber-based materials, porous composite materials, special composite materials, and amorphous materials.

8. The composite thermal insulation material for cryogenic cargo holds according to claim 1, characterized in that, The adsorbent material includes at least one of the following: metal oxide-based adsorbent material, metal-based adsorbent material, porous material, carbon-based adsorbent material, hygroscopic agent, desiccant, and gas-specific adsorbent material.

9. The composite thermal insulation material for cryogenic cargo holds according to claim 1, characterized in that, The density of the rigid polyurethane foam is 70 kg / m³. 3 Up to 350kg / m 3 , Its compressive strength at room temperature is 1.0 to 8 MPa, and its compressive strength at extremely low temperatures of -160℃±5℃ is 2.5 MPa to 23 MPa. The thermal conductivity at room temperature is 20 mW / mK to 25 mW / mK, and at extremely low temperatures of -160℃±5℃, the thermal conductivity is 10 mW / mK to 18 mW / mK.

10. The composite thermal insulation material for cryogenic cargo holds according to claim 1, characterized in that, The composite thermal insulation material has a compressive strength of 1.0 MPa to 8 MPa at room temperature, a compressive strength of 2.5 MPa to 23 MPa at extremely low temperatures of -160℃±5℃, and a thermal conductivity of 15 mW / mK at room temperature.

11. A cryogenic cargo hold, characterized in that, The composite thermal insulation material comprising any one of claims 1 to 10.

12. The cryogenic cargo hold according to claim 11, characterized in that, The cryogenic substance is at least one of liquid hydrogen, liquid nitrogen, liquid helium, and liquefied natural gas.

Images