Vacuum insulated panel suitable for cryogenic refrigerator and preparation method of vacuum insulated panel

Abstract

The invention provides a vacuum insulated panel suitable for a cryogenic refrigerator and a preparation method of the vacuum insulated panel. The vacuum insulated panel comprises an insulated panel body and a high-heat-insulation coating. The heat insulation plate comprises a composite core material, a barium radium getter and a membrane material. The composite core material and the barium radium getter are both arranged in the membrane material, and the high-heat-insulation coating is arranged on the outer surface of the membrane material; one surface of the membrane material is an aluminum foil membrane layer, the other surface of the membrane material is an aluminum-plated membrane layer, and the edge of the aluminum foil membrane layer is folded towards the aluminum-plated membrane 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 fibers, 5-8 parts by weight of aluminum silicate fibers and a mixed solution; the preparation method comprises the following steps: mixing epoxy resin, chitosan aerogel, glass fibers and aluminum silicate fibers, adding the mixture into a mixed solution, and uniformly stirring to obtain a spraying solution; and finally, the spraying liquid is sprayed to the surface of the heat insulation plate through a spraying gun, a high-heat-insulation coating is formed on the heat insulation plate, and the problem that the heat insulation capacity of the vacuum heat insulation plate is not high is solved.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum insulation panels, and in particular to a vacuum insulation panel suitable for a deep-freeze refrigerator and a preparation method thereof. Background Art

[0002] A cryogenic refrigerator is a thermal insulation device for ultra-low temperature storage. Through the circulation of refrigerant by the compressor, a low-pressure and low-temperature, high-pressure and high-temperature cycle is formed in the system to achieve the purpose of regulating temperature. Cryogenic refrigerators play an important role in scientific research, medical treatment and other fields, and put forward higher requirements for low-temperature resistance.

[0003] In the related art, there are two ways to improve the thermal insulation performance of deep-freeze refrigerators in terms of thermal insulation materials: one is through the polyurethane foam system, but in order to ensure the thermal insulation effect, a very thick foam layer will be formed, which will increase the thickness of the door and box of the deep-freeze refrigerator, and its weight will also increase accordingly, the floor area of ​​the deep-freeze refrigerator will increase, and the effective volume will decrease; the other is to use a combination of polyurethane foam system and vacuum insulation panels to jointly maintain the low temperature state of the box temperature, increase the effective volume, and reduce the floor area, but the vacuum insulation panel is prone to brittleness in the ultra-low temperature state, resulting in the destruction of the sealing, thereby losing the thermal insulation effect; at the same time, in the ultra-low temperature use environment, the thermal conductivity of the vacuum insulation panel is required to be lower. In addition, due to the damage of the folding method of the membrane material, the vacuum insulation panel has a certain risk of gas leakage, which in turn reduces the thermal insulation capacity of the vacuum insulation panel. Summary of the invention

[0004] The present application provides a vacuum insulation panel suitable for a deep-freeze refrigerator and a preparation method thereof, so as to solve the problem that the vacuum insulation panel has low thermal insulation capacity.

[0005] The first aspect of the present application provides a vacuum insulation panel suitable for a deep-freeze refrigerator, comprising: an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal 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 a film-forming substance, chitosan aerogel, glass fiber, and aluminum silicate fiber as fillers, and then adds them into a mixed solution to obtain a high thermal insulation coating, which is arranged on the surface of the insulation board to prepare a vacuum insulation board with good thermal insulation performance, which is suitable for the use environment and conditions of a deep-freeze refrigerator, and also meets the functions of puncture resistance and wear resistance. The high thermal insulation coating has a certain viscosity and is applied to the surface of the film material, so that the folded edge of the film material is more firmly bonded, solving the problem of low thermal insulation capacity of the vacuum insulation board. The edge of the aluminum foil film layer is folded toward the aluminum-plated film layer, which can reduce the possibility of air leakage caused by the internal wrinkles of the aluminum foil film layer, enhance the sealing effect of the vacuum insulation board, and thus reduce the failure rate of the vacuum insulation board. In addition, the use of biomass chitosan aerogel can reduce unnecessary pollution to the environment and lower the cost of the product.

[0007] Optionally, the composite core material is a core material comprising one or both of ultrafine glass fiber and fumed silica.

[0008] Since both ultra-fine glass fibers 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 the vacuum insulation panel, but also make the overall weight of the vacuum insulation panel lighter, making it easier to transport and install.

[0009] Optionally, the barium-radium getter is a metal oxide or a metal alloy.

[0010] Since metal oxides and metal alloys have high chemical stability, they can maintain stable adsorption properties and are not easily chemically reacted with other substances, thus ensuring the long service life of the vacuum insulation panels.

[0011] Optionally, the aluminized film layer is formed by compounding multiple layers of aluminum foil; the aluminized film layer is formed by compounding a vapor-deposited aluminum film.

[0012] The aluminized film layer of the multi-layer aluminum foil composite structure not only significantly improves the reflection ability of thermal radiation by increasing the reflection interface, thereby enhancing the thermal insulation effect of the insulation board; it also increases the thickness of the material to improve the overall mechanical strength, making the insulation board more durable and able to resist external impact and pressure. The aluminized film layer forms a uniform and dense aluminum film layer on the surface of the substrate through evaporation technology, which not only helps to achieve a more consistent thermal insulation effect and reduce the thermal bridge effect, but also helps to improve the stability and durability of the insulation board.

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

[0014] The excellent thermal insulation performance and low density of the chitosan aerogel can improve the overall thermal insulation effect while maintaining the lightweight of the coating. The high strength and heat resistance of the glass fiber can significantly improve the structural stability and tensile strength of the coating, ensuring reliability in long-term use. The aluminum silicate fiber has excellent high temperature resistance and corrosion resistance, which can further enhance the service life and stability of the coating in high temperature environments. The reasonable ratio of chitosan aerogel, glass fiber and aluminum silicate fiber can significantly improve the comprehensive performance of the high thermal insulation coating.

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

[0016] The mass ratio of the 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 thermal insulation coating, but also can significantly improve the mechanical strength, wear resistance and corrosion resistance of the high thermal insulation coating.

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

[0018] The mixed solvent composed of aromatic solvents, esters and ketone solvents can improve the solubility of the high thermal insulation coating, make the high thermal insulation coating more adhesive, and ensure the uniform distribution of the high thermal insulation coating. The mixed solvent also has excellent chemical stability, excellent heat resistance and weather resistance. It can not only resist the erosion of chemical substances such as acids and alkalis, extend the service life of the high thermal insulation coating, but also maintain stable performance under high temperature and severe weather conditions. In addition, the mixed solvent uses low-toxicity and low-volatility components, which can reduce production costs while meeting environmental protection requirements.

[0019] A second aspect of the present application provides a method for preparing a vacuum insulation panel suitable for a deep freezer, which is used to prepare the vacuum insulation panel suitable for a deep freezer described in the first aspect, and the method comprises:

[0020] Mixing 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;

[0021] Adding the mixture into the mixed solution and stirring evenly to obtain a spraying solution;

[0022] The spraying liquid is sprayed on the surface of the insulation board by a spray gun and left to stand for a preset time to form a high heat insulation coating on the insulation board.

[0023] The above method can not only ensure the strength and stability of the high thermal insulation coating, but also improve the thermal insulation performance of the high thermal insulation coating by mixing epoxy resin, chitosan aerogel, glass fiber and aluminum silicate fiber in a proportion. Adding the mixture to the mixed solution and stirring evenly helps to improve the solubility and compatibility of each component, so that the high thermal insulation coating can be evenly distributed and firmly attached on a variety of surfaces, thereby improving the overall performance. Spraying the spray liquid on the surface of the insulation board with a spray gun and letting it stand for a preset time to form a high thermal insulation coating on the insulation board is not only easy to operate, but also improves construction efficiency.

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

[0025] The preset time is 10-30 minutes, which can not only ensure that the spray liquid is fully stationary and solidified on the surface of the insulation board, thereby improving the stability and durability of the high thermal insulation coating, but also effectively control the time cost in the production process, improve the overall process efficiency, reduce the production cycle, and increase production capacity. In addition, the appropriate standing time helps the spray liquid to be evenly distributed and well adhered to the surface of the insulation board, improve the mechanical properties of the high thermal insulation coating, and release the internal stress of the high thermal insulation coating, reduce the cracking and bubbling of the high thermal insulation coating, thereby significantly improving the overall quality of the high thermal insulation coating.

[0026] Optionally, the spraying volume of the spray gun is 1000-5000 ml / m2.

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

[0028] It can be seen from the above technical scheme that the present application provides a vacuum insulation panel suitable for a deep-freezer and a preparation method thereof, wherein the vacuum insulation panel comprises an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating comprises 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 added into the mixed solution and stirred evenly to obtain a spraying liquid; finally, the spraying liquid is sprayed on the surface of the insulation board by a spray gun, and is left to stand for a preset time to form a high thermal insulation coating on the insulation board, thereby solving the problem of low thermal insulation capacity of the vacuum insulation board. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a schematic flow chart of a method for preparing a vacuum insulation panel suitable for a deep-freeze refrigerator according to an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the performance test results of the vacuum insulation panels corresponding to the examples and comparative examples of the vacuum insulation panels suitable for deep-freeze refrigerators described in the embodiments of the present application. DETAILED DESCRIPTION

[0032] The embodiments will be described in detail below, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following embodiments do not represent all implementation methods consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application.

[0033] In order to solve the problem of low thermal insulation capacity of vacuum insulation panels, some embodiments of the present application provide a vacuum insulation panel suitable for deep-freeze refrigerators, including: an insulation panel and a high thermal insulation coating; the insulation panel includes a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating includes 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 a film-forming substance, and the chitosan aerogel, the glass fiber, and the 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, and can not only efficiently absorb and fix the residual gas in the vacuum insulation panel and the gas infiltrated from the external environment, but also help maintain the high vacuum degree inside the vacuum insulation panel, thereby improving its insulation performance; it can also maintain its adsorption performance under different temperature and pressure conditions to maintain the stability of the purified gas.

[0035] This application selects epoxy resin as a film-forming substance, chitosan aerogel, glass fiber, and aluminum silicate fiber as fillers, and then adds them into a mixed solution to obtain a high thermal insulation coating, which is arranged on the surface of the insulation board to prepare a vacuum insulation board with good thermal insulation performance, which is suitable for the use environment and conditions of a deep-freeze refrigerator, and also meets the functions of puncture resistance and wear resistance. The high thermal insulation coating has a certain viscosity and is applied to the surface of the film material, so that the folded edge of the film material is more firmly bonded, solving the problem of low thermal insulation capacity of the vacuum insulation board. The edge of the aluminum foil film layer is folded toward the aluminum-plated film layer, which can reduce the possibility of air leakage caused by the internal wrinkles of the aluminum foil film layer, enhance the sealing effect of the vacuum insulation board, and thus reduce the failure rate of the vacuum insulation board. In addition, the use of biomass chitosan aerogel can reduce unnecessary pollution to the environment and lower the cost of the product.

[0036] In some embodiments, the composite core material is a core material comprising one or both of ultra-fine glass fiber and fumed silica.

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

[0038] Since both ultra-fine 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. In addition, ultra-fine glass fiber has good mechanical strength and non-flammability, which can not only improve the compression and tensile properties of vacuum insulation panels, making them stable in various environments, but also improve the fireproof level of vacuum insulation panels and increase safety in use. Fumed silica has good chemical inertness and low moisture absorption rate. It is not only not easy to react with other substances, thereby extending the service life of vacuum insulation panels, but also helps to maintain the vacuum state inside the vacuum insulation panels and maintain their long-term stable insulation performance.

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

[0040] Since metal oxides and metal alloys have high chemical stability, they can maintain stable adsorption properties and are not easily chemically reacted with other substances, thus ensuring the long service life of the vacuum insulation panels.

[0041] In some embodiments, the aluminized film layer is formed by compounding multiple layers of aluminum foil; the aluminized film layer is formed by compounding evaporated aluminum film.

[0042] The aluminized film layer of the multi-layer aluminum foil composite structure not only significantly improves the reflection ability of thermal radiation by increasing the reflection interface, thereby enhancing the thermal insulation effect of the insulation board; it also increases the thickness of the material to improve the overall mechanical strength, making the insulation board more durable and able to resist external impact and pressure. The aluminized film layer forms a uniform and dense aluminum film layer on the surface of the substrate through evaporation technology, which not only helps to achieve a more consistent thermal insulation effect and reduce the thermal bridge effect, but also helps to improve the stability and durability of the insulation board.

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

[0044] The excellent thermal insulation performance and low density of the chitosan aerogel can improve the overall thermal insulation effect while maintaining the lightweight of the coating. The high strength and heat resistance of the glass fiber can significantly improve the structural stability and tensile strength of the coating, ensuring reliability in long-term use. The aluminum silicate fiber has excellent high temperature resistance and corrosion resistance, which can further enhance the service life and stability of the coating in high temperature environments. The reasonable ratio of chitosan aerogel, glass fiber and aluminum silicate fiber can significantly improve the comprehensive performance of the high thermal insulation coating.

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

[0046] The mass ratio of the 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 thermal insulation coating, but also can significantly improve the mechanical strength, wear resistance and corrosion resistance of the high thermal insulation coating.

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

[0048] The mixed solvent composed of aromatic solvents, esters and ketone solvents can improve the solubility of the high thermal insulation coating, make the high thermal insulation coating more adhesive, and ensure the uniform distribution of the high thermal insulation coating. The mixed solvent also has excellent chemical stability, excellent heat resistance and weather resistance. It can not only resist the erosion of chemical substances such as acids and alkalis, extend the service life of the high thermal insulation coating, but also maintain stable performance under high temperature and severe weather conditions. In addition, the mixed solvent uses low-toxicity and low-volatility components, which can reduce production costs while meeting environmental protection requirements.

[0049] See also Figure 1 Some embodiments of the present application also provide a method for preparing a vacuum insulation panel suitable for a deep freezer, which is used to prepare the vacuum insulation panel suitable for a deep freezer described in the above embodiment, and the method comprises:

[0050] S100: 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 are mixed to obtain a mixture.

[0051] S200: adding the mixture into the mixed solution and stirring evenly to obtain a spraying solution.

[0052] It should be understood that the spray liquid can be mixed evenly by mechanical stirring, which can quickly and evenly mix materials of different components together, ensure that the components are fully contacted and reacted, and ensure that the components can be evenly mixed and dispersed.

[0053] S300: spraying the spraying liquid onto the surface of the insulation board through a spray gun and leaving it to stand for a preset time to form a high thermal 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; the composite core material and the barium-radium getter are both arranged inside the membrane material, and the high thermal insulation coating is arranged 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, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer.

[0055] The above method can not only ensure the strength and stability of the high thermal insulation coating, but also improve the thermal insulation performance of the high thermal insulation coating by mixing epoxy resin, chitosan aerogel, glass fiber and aluminum silicate fiber in a proportion. Adding the mixture to the mixed solution and stirring evenly helps to improve the solubility and compatibility of each component, so that the high thermal insulation coating can be evenly distributed and firmly attached on a variety of surfaces, thereby improving the overall performance. Spraying the spray liquid on the surface of the insulation board with a spray gun and letting it stand for a preset time to form a high thermal insulation coating on the insulation board is not only easy to operate, but also improves construction efficiency.

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

[0057] The preset time is 10-30 minutes, which can not only ensure that the spray liquid is fully stationary and solidified on the surface of the insulation board, thereby improving the stability and durability of the high thermal insulation coating, but also effectively control the time cost in the production process, improve the overall process efficiency, reduce the production cycle, and increase production capacity. In addition, the appropriate standing time helps the spray liquid to be evenly distributed and well adhered to the surface of the insulation board, improve the mechanical properties of the high thermal insulation coating, and release the internal stress of the high thermal insulation coating, reduce the cracking and bubbling of the high thermal insulation coating, thereby significantly improving the overall quality of the high thermal insulation coating.

[0058] In some embodiments, the spraying amount of the spray gun is 1000-5000 ml / m2.

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

[0060] Embodiment 1:

[0061] A vacuum insulation panel suitable for a deep-freeze refrigerator comprises: an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating comprises the following components in parts by weight: 100 g of epoxy resin, 30 g of chitosan aerogel, 5 g of glass fiber, 5 g of aluminum silicate fiber and a mixed solution.

[0062] The method for preparing a vacuum insulation panel suitable for a deep freezer comprises:

[0063] 100g of epoxy resin is mixed with 30g of chitosan aerogel, 5g of glass fiber, and 5g of aluminum silicate fiber, and added to the mixed solution and mechanically stirred to mix evenly, so that various effects can be fully released and each component can be evenly mixed and dispersed to obtain a spraying liquid. The mixed solution is formed by taking xylene, n-butanol, and dibutyl phthalate solution in a ratio of 5:2:7.

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

[0065] Embodiment 2:

[0066] A vacuum insulation panel suitable for a deep-freeze refrigerator comprises: an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating comprises the following components in parts by weight: 110 g of epoxy resin, 40 g of chitosan aerogel, 5 g of glass fiber, 5 g of aluminum silicate fiber and a mixed solution.

[0067] The method for preparing a vacuum insulation panel suitable for a deep freezer comprises:

[0068] 110g of epoxy resin is mixed with 40g of chitosan aerogel, 5g of glass fiber and 5g of aluminum silicate fiber, and added to the mixed solution and mechanically stirred to mix evenly, so that various effects can be fully released and each component can be evenly mixed and dispersed to obtain a spraying liquid. The mixed solution is formed by taking xylene, n-butanol and dibutyl phthalate solution in a ratio of 5:2:7 respectively.

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

[0070] Embodiment 3:

[0071] A vacuum insulation panel suitable for a deep-freeze refrigerator comprises: an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating comprises the following components in parts by weight: 90g of epoxy resin, 40g of chitosan aerogel, 5g of glass fiber, 5g of aluminum silicate fiber and a mixed solution.

[0072] The method for preparing a vacuum insulation panel suitable for a deep freezer comprises:

[0073] 90g of epoxy resin is mixed with 40g of chitosan aerogel, 5g of glass fiber and 5g of aluminum silicate fiber, and added to the mixed solution and mechanically stirred to mix evenly, so that various effects can be fully released and each component can be evenly mixed and dispersed to obtain a spraying liquid. The mixed solution is formed by taking xylene, n-butanol and dibutyl phthalate solution in a ratio of 5:2:7.

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

[0075] Comparative Example:

[0076] A vacuum insulation panel suitable for a deep-freeze refrigerator comprises: a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer.

[0077] The vacuum insulation panels corresponding to Examples 1, 2, and 3 and the comparative examples were tested for performance. To ensure the validity and wide recognition of the test results, the test method was based on the wear resistance according to GB / T 1768-1979 "Determination of Weathering Resistance of Paint Films"; the heat seal strength was based on QB / T 2358-1998 "Test Method for Heat Seal Strength of Plastic Packaging"; the thermal conductivity was determined using the JW-3 thermal conductivity tester of 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 examples are shown in Figure 2.

[0078] It can be seen that by mixing chitosan aerogel with thermal insulation fiber materials to form a low thermal conductivity high thermal insulation coating, radiation heat transfer and convection heat transfer can be effectively reduced, and after the reflection and emission of the surface coating, the radiation energy can be blocked to achieve the effect of isolating heat transfer. At the same time, since the air molecules in the micropores of the aerogel cannot conduct heat by convection, the thermal conductivity coefficient decreases as the aerogel component increases.

[0079] It can be seen from the above technical scheme that the embodiment of the present application provides a vacuum insulation panel suitable for a deep-freezer and a preparation method thereof, wherein the vacuum insulation panel comprises an insulation panel and a high thermal insulation coating; the insulation panel comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; the high thermal insulation coating comprises the following parts by weight: The composition 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, chitosan aerogel, glass fiber and aluminum silicate fiber are mixed to obtain a mixture; the mixture is added into the mixed solution and stirred evenly to obtain a spraying liquid; finally, the spraying liquid is sprayed on the surface of the insulation board by a spray gun, and is allowed to stand for a preset time to form a high insulation coating on the insulation board, thereby solving the problem of low insulation capacity of the vacuum insulation board.

[0080] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A vacuum insulation panel suitable for a deep freezer, characterized in that: include: Insulation panels and high thermal insulation coatings; The thermal insulation board comprises a composite core material, a barium-radium getter and a film material; the composite core material and the barium-radium getter are both arranged inside the film material, and the high thermal 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 aluminum-plated film layer, and the edge of the aluminum foil film layer is folded toward the aluminum-plated film layer; The high thermal 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 suitable for a deep freezer according to claim 1, characterized in that: The composite core material is a core material containing one or both of ultra-fine glass fiber and fumed silica.

3. The vacuum insulation panel suitable for a deep freezer according to claim 1, characterized in that: The barium-radium getter is one of metal oxides and metal alloys.

4. The vacuum insulation panel suitable for a deep freezer according to claim 1, characterized in that: The aluminized film layer is formed by compounding multiple layers of aluminum foil; the aluminized film layer is formed by compounding evaporated aluminum film.

5. The vacuum insulation panel suitable for a deep freezer according to claim 1, characterized in that: The mass of the chitosan aerogel accounts for 20%-30% of the total mass of the high thermal insulation coating, and the mass of the glass fiber and the aluminum silicate fiber each accounts for 3%-5% of the total mass of the high thermal insulation coating.

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

7.

7. The vacuum insulation panel for a deep freezer according to claim 1, characterized in that: The mixed solvent in the mixed solution is a mixed solvent composed of aromatic solvents, esters and ketones.

8. A method for preparing a vacuum insulation panel suitable for a deep-freeze refrigerator, characterized in that: The method for preparing the vacuum insulation panel suitable for a deep-freeze refrigerator according to any one of claims 1 to 7 comprises: Mixing 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; Adding the mixture into the mixed solution and stirring evenly to obtain a spraying solution; The spraying liquid is sprayed on the surface of the insulation board by a spray gun and left to stand for a preset time to form a high heat insulation coating on the insulation board.

9. The method for preparing a vacuum insulation panel suitable for a deep-freeze refrigerator 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 a deep-freeze refrigerator according to claim 8, characterized in that: The spraying amount of the spray gun is 1000-5000 ml / m2.

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