Vacuum insulation panel for a deep freeze refrigerator and method of manufacturing the same

Abstract

The application provides a vacuum heat insulation plate suitable for a deep-freezing refrigerator and a preparation method thereof. The vacuum heat insulation plate comprises a heat insulation plate and a high heat insulation coating. The heat insulation plate comprises a composite core material, a barium-radium getter and a film material. The composite core material and the barium-radium getter are arranged inside the film material, and the high heat insulation coating is arranged on the outer surface of the film material. One side of the film material is an aluminum foil film layer, and the other side of the film material is an aluminized film layer. The edge of the aluminum foil film layer is folded towards the aluminized film layer. The high heat insulation coating comprises 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber and a mixed solution. The epoxy resin, the chitosan aerogel, the glass fiber and the aluminum silicate fiber are mixed, and then added into the mixed solution and stirred uniformly to obtain a spraying liquid. Finally, the spraying liquid is sprayed on the surface of the heat insulation plate by a spray gun to form the high heat insulation coating on the heat insulation plate, so that the problem of low heat insulation capacity of the vacuum heat insulation plate is solved.

Description

Technical Field

[0001] This application relates to the field of vacuum insulation panel technology, and in particular to a vacuum insulation panel suitable for cryogenic refrigerators and its preparation method. Background Technology

[0002] Cryogenic refrigerators are thermal insulation devices for ultra-low temperature storage. They use a compressor to circulate a refrigerant, creating a cycle of low pressure and low temperature followed by high pressure and high temperature within the system to regulate temperature. Cryogenic refrigerators play an important role in scientific research, medical fields, and other areas, and therefore require even higher levels of low-temperature resistance.

[0003] In related technologies, there are two ways to improve the insulation performance of cryogenic refrigerators using insulation materials: one is through a polyurethane foam system, but to ensure the insulation effect, a very thick foam layer is formed, which increases the thickness of the door and body of the cryogenic refrigerator, thus increasing its weight, footprint, and effective volume; the other is by combining a polyurethane foam system with vacuum insulation panels to maintain the low temperature inside the refrigerator, increasing the effective volume and reducing the footprint. However, at ultra-low temperatures, the membrane material of the vacuum insulation panel is prone to embrittlement, leading to a loss of airtightness and insulation effect. Furthermore, in ultra-low temperature environments, the thermal conductivity of the vacuum insulation panel is required to be even lower. In addition, due to the folding method of the membrane material, there is a certain risk of gas leakage, which reduces the insulation capacity of the vacuum insulation panel. Summary of the Invention

[0004] This application provides a vacuum insulation panel suitable for cryogenic refrigerators and its preparation method to solve the problem of low heat insulation capacity of vacuum insulation panels.

[0005] The first aspect of this application provides a vacuum insulation panel suitable for cryogenic refrigerators, comprising: an insulation panel and a high-insulation coating; the insulation panel includes a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer, with the edge of the aluminum foil film layer folded towards the aluminized film layer; the high-insulation coating comprises the following components in parts by weight: 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber, and a mixed solution.

[0006] This application selects epoxy resin as the film-forming material and chitosan aerogel, glass fiber, and aluminum silicate fiber as fillers, adding them to a mixed solution to obtain a high-insulation coating. This coating is then applied to the surface of an insulation board, creating a vacuum insulation board with good thermal insulation performance. This makes it suitable for the operating environment and conditions of cryogenic refrigerators, while also meeting requirements for puncture resistance and wear resistance. Furthermore, the high-insulation coating has a certain degree of adhesion, ensuring stronger adhesion at the film surface and addressing the issue of low insulation capacity in vacuum insulation boards. The edges of the aluminum foil film layer are folded towards the aluminized film layer, reducing the possibility of air leakage caused by internal wrinkles in the aluminum foil film layer, enhancing the sealing effect of the vacuum insulation board, and thus reducing its failure rate. In addition, the use of biomass chitosan aerogel reduces unnecessary environmental pollution and lowers product costs.

[0007] Optionally, the composite core material may be a core material comprising one or two of ultrafine glass fibers and fumed silica.

[0008] Because both ultrafine glass fiber and fumed silica have extremely low thermal conductivity and low density, they can not only effectively reduce heat transfer and improve the insulation effect of vacuum insulation panels, but also make the overall weight of vacuum insulation panels lighter, making them easier to transport and install.

[0009] Optionally, the barium radium getter is one of metal oxides or metal alloys.

[0010] Because metal oxides and metal alloys have high chemical stability, they can maintain stable adsorption performance and are not prone to chemical reactions with other substances, thus ensuring the long service life of vacuum insulation panels.

[0011] Optionally, the aluminum-plated film layer is composed of multiple aluminum foil composites; or the aluminum-plated film layer is composed of vapor-deposited aluminum film composites.

[0012] The aluminized film layer in the multi-layer aluminum foil composite structure not only significantly improves the reflectivity of heat radiation by increasing the reflective interface, thereby enhancing the thermal insulation effect of the insulation board, but also increases the overall mechanical strength by increasing the material thickness, making the insulation board more durable and resistant to external impacts and pressures. The aluminized film layer is formed on the substrate surface using vapor deposition technology, resulting in a uniform and dense aluminum film layer. This not only helps achieve a more consistent thermal insulation effect and reduce thermal bridging effects, but also contributes to improving the stability and durability of the insulation board.

[0013] Optionally, the chitosan aerogel accounts for 20%-30% of the total mass of the high heat insulation coating, and the glass fiber and the aluminosilicate fiber each account for 3%-5% of the total mass of the high heat insulation coating.

[0014] The excellent thermal insulation properties and low density of the chitosan aerogel improve the overall thermal insulation effect while maintaining the lightweight nature of the coating. The high strength and heat resistance of the glass fiber significantly enhance the structural stability and tensile strength of the coating, ensuring reliability during long-term use. The excellent high-temperature resistance and corrosion resistance of the aluminosilicate fiber further enhance the service life and stability of the coating in high-temperature environments. The optimal ratio of chitosan aerogel, glass fiber, and aluminosilicate fiber significantly improves the overall performance of the high-insulation coating.

[0015] Optionally, the mixed solution includes xylene, n-butanol, and dibutyl phthalate solution; the mass ratio of xylene, n-butanol, and dibutyl phthalate solution is 5:2:7.

[0016] The mass ratio of xylene, n-butanol, and dibutyl phthalate solution is 5:2:7, which not only helps to improve the solubility and mixing uniformity of each component, thereby enhancing the overall performance and stability of the heat insulation coating, but also significantly improves the mechanical strength, wear resistance, and corrosion resistance of the high heat insulation coating.

[0017] Optionally, the mixed solvent in the mixed solution is a mixed solvent composed of aromatic solvents, esters and ketones.

[0018] A mixed solvent composed of aromatic solvents, esters, and ketones improves the solubility of the high-insulation coating, enhances its adhesion, and ensures uniform distribution. The mixed solvent also exhibits excellent chemical stability, outstanding heat resistance, and weather resistance, resisting corrosion from acids, alkalis, and other chemicals, extending the service life of the high-insulation coating, and maintaining stable performance under high temperatures and harsh weather conditions. Furthermore, the mixed solvent uses low-toxicity, low-volatility components, meeting environmental protection requirements while reducing production costs.

[0019] The second aspect of this application provides a method for preparing a vacuum insulation panel suitable for cryogenic refrigerators, used to prepare the vacuum insulation panel suitable for cryogenic refrigerators described in the first aspect, the method comprising:

[0020] Mix 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, and 5-8 parts by weight of aluminosilicate fiber to obtain a mixture.

[0021] The mixture is added to the mixing solution and stirred until homogeneous to obtain the spraying liquid;

[0022] The coating liquid is sprayed onto the surface of the insulation board using a spray gun and left to stand for a preset time to form a highly heat-insulating coating on the insulation board.

[0023] The above method, by mixing epoxy resin, chitosan aerogel, glass fiber, and aluminum silicate fiber in a specific ratio, not only ensures the strength and stability of the high-insulation coating but also improves its thermal insulation performance. Adding the mixture to the mixing solution and stirring thoroughly helps improve the solubility and compatibility of each component, allowing the high-insulation coating to be evenly distributed and firmly adhered to various surfaces, thereby enhancing overall performance. Spraying the coating onto the insulation board surface using a spray gun and allowing it to stand for a preset time to form the high-insulation coating not only facilitates operation but also improves construction efficiency.

[0024] Optionally, the preset time is 10-30 minutes.

[0025] The preset time of 10-30 minutes not only ensures that the sprayed liquid can fully settle and cure on the surface of the insulation board, thereby improving the stability and durability of the high-insulation coating, but also effectively controls the time cost in the production process, improves the overall process efficiency, reduces the production cycle, and increases production capacity. Furthermore, an appropriate settling time helps the sprayed liquid to be evenly distributed and well-adhered to the surface of the insulation board, improving the mechanical properties of the high-insulation coating. It also allows the internal stress of the high-insulation coating to be released, reducing cracking and blistering, thus significantly improving the overall quality of the high-insulation coating.

[0026] Optionally, the spray gun can spray 1000-5000 ml / m².

[0027] By setting the spraying amount to 1000-5000 ml / m², it is possible not only to ensure that the high heat insulation coating is evenly distributed on the surface of the insulation board and to avoid performance differences caused by uneven thickness of the high heat insulation coating, but also to improve the coverage of the high heat insulation coating, reduce missed coatings and defects, and enhance the overall protective effect.

[0028] As can be seen from the above technical solutions, this application provides a vacuum insulation panel suitable for cryogenic refrigerators and its preparation method. The vacuum insulation panel includes an insulation panel and a high-insulation coating. The insulation panel includes a composite core material, a barium radium getter, and a membrane material. The composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material. One side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer. The edge of the aluminum foil film layer is folded towards the aluminized film layer. The high-insulation coating includes the following components in parts by weight. Composition: 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber, and a mixed solution; the epoxy resin, chitosan aerogel, glass fiber, and aluminum silicate fiber are mixed to obtain a mixture; the mixture is then added to the mixed solution and stirred evenly to obtain a spraying liquid; finally, the spraying liquid is sprayed onto the surface of the insulation board using a spray gun and left to stand for a preset time to form a high heat insulation coating on the insulation board, solving the problem of low heat insulation capacity of vacuum insulation boards. Attached Figure Description

[0029] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic flowchart of the method for preparing a vacuum insulation panel suitable for cryogenic refrigerators as described in the embodiments of this application;

[0031] Figure 2 This diagram illustrates the performance test results of the vacuum insulation panels in the embodiments and comparative examples of the vacuum insulation panels suitable for cryogenic refrigerators described in this application. Detailed Implementation

[0032] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application.

[0033] To address the issue of low thermal insulation capacity in vacuum insulation panels, some embodiments of this application provide a vacuum insulation panel suitable for cryogenic refrigerators, comprising: an insulation panel and a high-insulation coating; the insulation panel includes a composite core material, a barium radium getter, and a membrane material; both the composite core material and the barium radium getter are disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer, with the edge of the aluminum foil film layer folded towards the aluminized film layer; the high-insulation coating comprises the following components in parts by weight: 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber, and a mixed solution.

[0034] It should be understood that the epoxy resin is the film-forming substance, and the chitosan aerogel, glass fiber, and aluminum silicate fiber are fillers. The barium radium getter refers to an alloy or compound containing barium and other elements (such as aluminum, zirconium, etc.), which can adsorb gas molecules under specific conditions. It can not only efficiently absorb and fix residual gases within the vacuum insulation panel and gases permeating from the external environment, helping to maintain the high vacuum level inside the vacuum insulation panel and thus improving its insulation performance; it can also maintain its adsorption performance under different temperature and pressure conditions, maintaining the stability of the purified gas.

[0035] This application selects epoxy resin as the film-forming material and chitosan aerogel, glass fiber, and aluminum silicate fiber as fillers, adding them to a mixed solution to obtain a high-insulation coating. This coating is then applied to the surface of an insulation board, creating a vacuum insulation board with good thermal insulation performance. This makes it suitable for the operating environment and conditions of cryogenic refrigerators, while also meeting requirements for puncture resistance and wear resistance. Furthermore, the high-insulation coating has a certain degree of adhesion, ensuring stronger adhesion at the film surface and addressing the issue of low insulation capacity in vacuum insulation boards. The edges of the aluminum foil film layer are folded towards the aluminized film layer, reducing the possibility of air leakage caused by internal wrinkles in the aluminum foil film layer, enhancing the sealing effect of the vacuum insulation board, and thus reducing its failure rate. In addition, the use of biomass chitosan aerogel reduces unnecessary environmental pollution and lowers product costs.

[0036] In some embodiments, the composite core material is a core material comprising one or two of ultrafine glass fibers and fumed silica.

[0037] It should be understood that the ultrafine glass fiber is a fibrous material with a diameter of less than 2 micrometers, made from quartz sand, feldspar, boric acid, etc., as the main raw materials, after being melted at high temperature. The fumed silica is a fine and special amorphous silica product obtained by high-temperature hydrolysis of halosilanes in an oxyhydrogen flame.

[0038] Both ultrafine glass fiber and fumed silica have extremely low thermal conductivity and low density, which not only effectively reduces heat transfer and improves the insulation effect of vacuum insulation panels, but also makes the overall weight of the vacuum insulation panels lighter, facilitating transportation and installation. Furthermore, ultrafine glass fiber has good mechanical strength and non-combustibility, which not only improves the compressive and tensile strength of the vacuum insulation panels, ensuring their stability in various environments, but also improves their fire resistance rating, increasing safety in use. Fumed silica has good chemical inertness and low moisture absorption, making it less likely to react with other substances, thus extending the service life of the vacuum insulation panels. It also helps maintain the vacuum state inside the panels, ensuring their long-term stable insulation performance.

[0039] In some embodiments, the barium radium getter is one of a metal oxide or a metal alloy.

[0040] Because metal oxides and metal alloys have high chemical stability, they can maintain stable adsorption performance and are not prone to chemical reactions with other substances, thus ensuring the long service life of vacuum insulation panels.

[0041] In some embodiments, the aluminum-plated film layer is composed of multiple aluminum foil composites; the aluminum-plated film layer is composed of vapor-deposited aluminum film composites.

[0042] The aluminized film layer in the multi-layer aluminum foil composite structure not only significantly improves the reflectivity of heat radiation by increasing the reflective interface, thereby enhancing the thermal insulation effect of the insulation board, but also increases the overall mechanical strength by increasing the material thickness, making the insulation board more durable and resistant to external impacts and pressures. The aluminized film layer is formed on the substrate surface using vapor deposition technology, resulting in a uniform and dense aluminum film layer. This not only helps achieve a more consistent thermal insulation effect and reduce thermal bridging effects, but also contributes to improving the stability and durability of the insulation board.

[0043] In some embodiments, the chitosan aerogel accounts for 20%-30% of the total mass of the high heat insulation coating, and the glass fiber and the aluminosilicate fiber each account for 3%-5% of the total mass of the high heat insulation coating.

[0044] The excellent thermal insulation properties and low density of the chitosan aerogel improve the overall thermal insulation effect while maintaining the lightweight nature of the coating. The high strength and heat resistance of the glass fiber significantly enhance the structural stability and tensile strength of the coating, ensuring reliability during long-term use. The excellent high-temperature resistance and corrosion resistance of the aluminosilicate fiber further enhance the service life and stability of the coating in high-temperature environments. The optimal ratio of chitosan aerogel, glass fiber, and aluminosilicate fiber significantly improves the overall performance of the high-insulation coating.

[0045] In some embodiments, the mixed solution comprises xylene, n-butanol, and dibutyl phthalate solution; the mass ratio of xylene, n-butanol, and dibutyl phthalate solution is 5:2:7.

[0046] The mass ratio of xylene, n-butanol, and dibutyl phthalate solution is 5:2:7, which not only helps to improve the solubility and mixing uniformity of each component, thereby enhancing the overall performance and stability of the high heat insulation coating, but also significantly improves the mechanical strength, wear resistance, and corrosion resistance of the high heat insulation coating.

[0047] In some embodiments, the mixed solvent in the mixed solution is a mixed solvent composed of aromatic solvents, esters and ketones.

[0048] A mixed solvent composed of aromatic solvents, esters, and ketones improves the solubility of the high-insulation coating, enhances its adhesion, and ensures uniform distribution. The mixed solvent also exhibits excellent chemical stability, outstanding heat resistance, and weather resistance, resisting corrosion from acids, alkalis, and other chemicals, extending the service life of the high-insulation coating, and maintaining stable performance under high temperatures and harsh weather conditions. Furthermore, the mixed solvent uses low-toxicity, low-volatility components, meeting environmental protection requirements while reducing production costs.

[0049] See Figure 1 This application also provides a method for preparing a vacuum insulation panel suitable for cryogenic refrigerators, in some embodiments, for preparing the vacuum insulation panel suitable for cryogenic refrigerators described in the above embodiments. The method includes:

[0050] S100: Mix 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, and 5-8 parts by weight of aluminum silicate fiber to obtain a mixture.

[0051] S200: Add the mixture to the mixing solution and stir until homogeneous to obtain the spraying liquid.

[0052] It should be understood that mechanical stirring can be used to mix the spray liquid evenly, which can quickly and evenly mix materials of different components together, ensure that each component is in full contact and reacts, and ensure that each component can be evenly mixed and dispersed.

[0053] S300: The spraying liquid is sprayed onto the surface of the insulation board using a spray gun and left to stand for a preset time to form a high heat insulation coating on the insulation board.

[0054] It should be understood that the insulation board includes a composite core material, a barium radium getter, and a membrane material; both the composite core material and the barium radium getter are disposed inside the membrane material, and the high heat insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminum-plated film layer, with the edge of the aluminum foil film layer folded towards the aluminum-plated film layer.

[0055] The above method, by mixing epoxy resin, chitosan aerogel, glass fiber, and aluminum silicate fiber in a specific ratio, not only ensures the strength and stability of the high-insulation coating but also improves its thermal insulation performance. Adding the mixture to the mixing solution and stirring thoroughly helps improve the solubility and compatibility of each component, allowing the high-insulation coating to be evenly distributed and firmly adhered to various surfaces, thereby enhancing overall performance. Spraying the coating onto the insulation board surface using a spray gun and allowing it to stand for a preset time to form the high-insulation coating not only facilitates operation but also improves construction efficiency.

[0056] In some embodiments, the preset time is 10-30 minutes.

[0057] The preset time of 10-30 minutes not only ensures that the sprayed liquid can fully settle and cure on the surface of the insulation board, thereby improving the stability and durability of the high-insulation coating, but also effectively controls the time cost in the production process, improves the overall process efficiency, reduces the production cycle, and increases production capacity. Furthermore, an appropriate settling time helps the sprayed liquid to be evenly distributed and well-adhered to the surface of the insulation board, improving the mechanical properties of the high-insulation coating. It also allows the internal stress of the high-insulation coating to be released, reducing cracking and blistering, thus significantly improving the overall quality of the high-insulation coating.

[0058] In some embodiments, the spray gun has a spray volume of 1000-5000 ml / m².

[0059] By setting the spraying amount to 1000-5000 ml / m², it is possible not only to ensure that the high heat insulation coating is evenly distributed on the surface of the insulation board and to avoid performance differences caused by uneven thickness of the high heat insulation coating, but also to improve the coverage of the high heat insulation coating, reduce missed coatings and defects, and enhance the overall protective effect.

[0060] Example 1:

[0061] A vacuum insulation panel suitable for cryogenic refrigerators includes: an insulation panel and a high-insulation coating; the insulation panel includes a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer, with the edge of the aluminum foil film layer folded towards the aluminized film layer; the high-insulation coating comprises the following components in parts by weight: 100g epoxy resin, 30g chitosan aerogel, 5g glass fiber, 5g aluminum silicate fiber, and a mixed solution.

[0062] Methods for preparing vacuum insulation panels suitable for cryogenic refrigerators include:

[0063] 100g of epoxy resin was mixed with 30g of chitosan aerogel, 5g of glass fiber, and 5g of aluminum silicate fiber. The mixture was then added to the solution and mechanically stirred until homogeneous, ensuring the full release of all effects and uniform mixing and dispersion of the components to obtain the spray coating. The mixed solution was prepared by mixing xylene, n-butanol, and dibutyl phthalate solutions in a 5:2:7 ratio.

[0064] The spraying liquid is sprayed onto the surface of the insulation board using a spray gun, and after standing for 20 minutes, a high heat insulation coating is formed on the insulation board. The spraying amount of the spray gun is 3000 ml / m².

[0065] Example 2:

[0066] A vacuum insulation panel suitable for cryogenic refrigerators includes: an insulation panel and a high-insulation coating; the insulation panel includes a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer, with the edge of the aluminum foil film layer folded towards the aluminized film layer; the high-insulation coating comprises the following components in parts by weight: 110g epoxy resin, 40g chitosan aerogel, 5g glass fiber, 5g aluminum silicate fiber, and a mixed solution.

[0067] Methods for preparing vacuum insulation panels suitable for cryogenic refrigerators include:

[0068] 110g of epoxy resin was mixed with 40g of chitosan aerogel, 5g of glass fiber, and 5g of aluminum silicate fiber. The mixture was then added to the solution and mechanically stirred until homogeneous, ensuring the full release of all effects and uniform mixing and dispersion of the components to obtain the spray coating. The mixed solution was prepared by mixing xylene, n-butanol, and dibutyl phthalate solutions in a 5:2:7 ratio.

[0069] The spraying liquid is sprayed onto the surface of the insulation board using a spray gun, and after standing for 20 minutes, a high heat insulation coating is formed on the insulation board. The spraying amount of the spray gun is 3000 ml / m².

[0070] Example 3:

[0071] A vacuum insulation panel suitable for cryogenic refrigerators includes: an insulation panel and a high-insulation coating; the insulation panel includes a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer, with the edge of the aluminum foil film layer folded towards the aluminized film layer; the high-insulation coating comprises the following components in parts by weight: 90g epoxy resin, 40g chitosan aerogel, 5g glass fiber, 5g aluminum silicate fiber, and a mixed solution.

[0072] Methods for preparing vacuum insulation panels suitable for cryogenic refrigerators include:

[0073] 90g of epoxy resin was mixed with 40g of chitosan aerogel, 5g of glass fiber, and 5g of aluminum silicate fiber. The mixture was then added to the solution and mechanically stirred until homogeneous, ensuring the full release of all effects and uniform mixing and dispersion of the components to obtain the spray coating. The mixed solution was prepared by mixing xylene, n-butanol, and dibutyl phthalate solutions in a 5:2:7 ratio.

[0074] The spraying liquid is sprayed onto the surface of the insulation board using a spray gun, and after standing for 20 minutes, a high heat insulation coating is formed on the insulation board. The spraying amount of the spray gun is 3000 ml / m².

[0075] Comparative example:

[0076] The vacuum insulation panel for cryogenic refrigerators includes: a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high heat insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminum-plated film layer, with the edge of the aluminum foil film layer folded towards the aluminum-plated film layer.

[0077] The vacuum insulation panels corresponding to Examples 1, 2, and 3, and the comparative example, were subjected to performance tests. To ensure the validity and broad acceptance of the test results, the test methods were as follows: abrasion resistance was tested according to GB / T 1768-1979 "Determination of Weather Resistance of Coating Film"; heat seal strength was tested according to QB / T 2358-1998 "Test Method for Heat Seal Strength of Plastic Packaging"; and thermal conductivity was measured using a JW-3 thermal conductivity meter from Beijing Jianyan Tianrun Technology Co., Ltd. The performance test results of the vacuum insulation panels corresponding to Examples 1, 2, and 3, and the comparative example are available in [reference needed]. Figure 2.

[0078] It is evident that by mixing chitosan aerogel with insulating fiber materials to form a low-thermal-conductivity, high-insulation coating, both radiative and convective heat transfer can be effectively reduced. Furthermore, the reflection and emission effects of the surface coating can block radiative energy, thus achieving the effect of heat transfer isolation. Simultaneously, because the air molecules within the micropores of the aerogel cannot conduct heat through convection, the thermal conductivity decreases with increasing aerogel content.

[0079] As can be seen from the above technical solutions, this application provides a vacuum insulation panel suitable for cryogenic refrigerators and its preparation method. The vacuum insulation panel includes an insulation panel and a high-insulation coating. The insulation panel includes a composite core material, a barium radium getter, and a membrane material. The composite core material and the barium radium getter are both disposed inside the membrane material, and the high-insulation coating is disposed on the outer surface of the membrane material. One side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminized film layer. The edge of the aluminum foil film layer is folded towards the aluminized film layer. The high-insulation coating comprises the following parts by weight: Composition: 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber, and a mixed solution; the epoxy resin, chitosan aerogel, glass fiber, and aluminum silicate fiber are mixed to obtain a mixture; the mixture is then added to the mixed solution and stirred evenly to obtain a spraying liquid; finally, the spraying liquid is sprayed onto the surface of the insulation board using a spray gun and left to stand for a preset time to form a high heat insulation coating on the insulation board, solving the problem of low heat insulation capacity of vacuum insulation boards.

[0080] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A vacuum insulation panel suitable for cryogenic refrigerators, characterized in that, include: Insulation panels and high-insulation coating; The insulation board includes a composite core material, a barium radium getter, and a membrane material; the composite core material and the barium radium getter are both disposed inside the membrane material, and the high heat insulation coating is disposed on the outer surface of the membrane material; one side of the membrane material is an aluminum foil film layer, and the other side of the membrane material is an aluminum-plated film layer, with the edge of the aluminum foil film layer folded towards the aluminum-plated film layer; The high heat insulation coating comprises the following components in parts by weight: 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, 5-8 parts by weight of aluminum silicate fiber, and a mixed solution.

2. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The composite core material is a core material containing one or two of ultrafine glass fibers and fumed silica.

3. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The barium radium getter is one of the following: metal oxide or metal alloy.

4. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The aluminum-plated film layer is composed of multiple layers of aluminum foil; the aluminum-plated film layer is composed of vapor-deposited aluminum film.

5. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The chitosan aerogel accounts for 20%-30% of the total mass of the high heat insulation coating, and the glass fiber and the aluminosilicate fiber each account for 3%-5% of the total mass of the high heat insulation coating.

6. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The mixed solution includes xylene, n-butanol, and dibutyl phthalate solution; The mass ratio of xylene, n-butanol, and dibutyl phthalate solution is 5:2:

7.

7. The vacuum insulation panel for cryogenic refrigerators according to claim 1, characterized in that, The mixed solvent in the mixed solution is a mixture of aromatic solvents, esters and ketones.

8. A method for preparing a vacuum insulation panel suitable for cryogenic refrigerators, characterized in that, The method for preparing the vacuum insulation panel suitable for cryogenic refrigerators according to any one of claims 1-7 comprises: Mix 90-110 parts by weight of epoxy resin, 30-40 parts by weight of chitosan aerogel, 5-8 parts by weight of glass fiber, and 5-8 parts by weight of aluminosilicate fiber to obtain a mixture. The mixture is added to the mixing solution and stirred until homogeneous to obtain the spraying liquid; The coating liquid is sprayed onto the surface of the insulation board using a spray gun and left to stand for a preset time to form a highly heat-insulating coating on the insulation board.

9. The method for preparing a vacuum insulation panel suitable for cryogenic refrigerators according to claim 8, characterized in that, The preset time is 10-30 minutes.

10. The method for preparing a vacuum insulation panel suitable for cryogenic refrigerators according to claim 8, characterized in that, The spray gun has a coating volume of 1000-5000 ml / m².

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