Vacuum insulated panel of organic fiber core material and preparation method of vacuum insulated panel
The vacuum insulation plate is prepared through low-temperature freezing molding and vacuum drying processes, which solves the melting and bonding problems of organic fibers during high-temperature baking, achieves low thermal conductivity and safe production, expands the source of materials, and reduces costs.
Patent Information
- Application Number
- CN202411382281.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-11
AI Technical Summary
The vacuum insulation plates prepared from existing organic fibers are easily melted and bonded during high-temperature baking, resulting in a thermal conductivity higher than the theoretical value and pose safety hazards.
The vacuum insulation plate is prepared by low-temperature freezing molding and vacuum freeze-drying processes. The core material is prepared by low-temperature freezing molding and vacuum drying to avoid high-temperature baking, and combined with sunscreen and dispersant to ensure uniform dispersion.
It effectively reduces the thermal conductivity of the vacuum insulation plate, brings it close to the theoretical value, improves production safety, and expands the source of organic fiber materials to control costs.
Smart Images
Figure CN120292364A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of vacuum insulation, and particularly relates to a vacuum insulation panel and a preparation method thereof. Background Art
[0002] Vacuum insulation materials generally refer to light, loose, porous single or composite materials that have obvious impedance and absorption to heat flow and have the physical property of low thermal conductivity. Insulation materials mainly include rock wool fiber, glass fiber, porous polystyrene, powdered silica, aerogel, and vacuum insulation panels, etc. Among the currently discovered materials, the vacuum insulation panel is the insulation material with the lowest thermal conductivity. The vacuum insulation panel can be prepared from a variety of materials, such as inorganic materials, organic materials, etc. Among them, the performance of the vacuum insulation panel prepared from organic fibers not only depends on the intrinsic properties of the fibers themselves, but also is affected by the porosity and contact area of the core material. However, the wet core material needs to go through a high-temperature baking step. However, currently, low-melting organic fibers will melt and bond at high temperatures, and high-temperature baking will cause the size of the organic fibers to shrink or the porosity to decrease, ultimately resulting in the thermal conductivity of the vacuum insulation panel being higher than the theoretical value. In addition, existing organic fiber materials may even cause safety accidents such as fires during high-temperature baking.
[0003] Therefore, in view of the above deficiencies, the present invention is specifically proposed. Summary of the Invention
[0004] The purpose of the present invention is to provide a vacuum insulation panel and a preparation method thereof to solve the problem that the thermal conductivity of the vacuum insulation panel prepared from organic fibers in the prior art cannot reach the theoretical value.
[0005] In the first aspect of the present invention, a vacuum insulation panel is provided, which includes a core material, a desiccant, a getter, and a film material. The film material is in a bag shape, and the core material, the desiccant, and the getter are vacuum encapsulated in the film material; wherein
[0006] The core material includes organic fibers, a dispersant, and a light-shielding agent. The organic fibers, the dispersant, and the light-shielding agent are mixed with water to obtain a fiber dispersion liquid, and the fiber dispersion liquid is prepared into the core material through a low-temperature freezing and molding step and a vacuum freeze-drying step.
[0007] The vacuum insulation panel provided by the present invention may also have the following additional technical features:
[0008] In a specific embodiment of the present invention, the organic fibers include one or more of polyester, acrylic, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber, poly(p-phenylene benzobisoxazole) fiber, polybenzimidazole fiber, poly(p-phenylene pyridinediimidazole) fiber, and polyimide fiber.
[0009] In a specific embodiment of the present invention, the diameter of the organic fiber is 5-60 μm, and / or the length of the organic fiber is 5-45 μm.
[0010] In a specific embodiment of the present invention, the light-shielding agent is nano-titanium dioxide or nano-carbon black.
[0011] In a specific embodiment of the present invention, the mass percentage of the light-shielding agent is 0.1%-5%, the dosage of the dispersant is 0.05%-10%, and the rest is the organic fiber.
[0012] In a specific embodiment of the present invention, the number of the core materials is one or more, and when the number of the core materials is multiple, the multiple core materials are stacked.
[0013] The second aspect of the present invention also provides a preparation method of a vacuum insulation panel as described in any one of the above, including:
[0014] S100: Adding a predetermined amount of organic fiber into an aqueous solution mixed with a predetermined amount of dispersant and light-shielding agent and mixing evenly to obtain a fiber dispersion;
[0015] S200: Pouring the obtained fiber dispersion into a prefabricated mold and freezing it at a low temperature to obtain an intermediate;
[0016] S300: Sequentially performing vacuum freeze-drying treatment and normal-temperature air-drying treatment on the obtained intermediate to obtain a core material;
[0017] S400: Loading the obtained core material into a film material formed into a film bag shape, evacuating to a preset vacuum degree and then performing pressure-holding heat sealing to obtain the vacuum insulation panel.
[0018] In a specific embodiment of the present invention, in S100, the organic fiber, the dispersant and the light-shielding agent are mixed evenly by a stirring kettle, and a flat blade stirrer, a pitched blade stirrer or a helical blade stirrer is provided in the stirring kettle.
[0019] In a specific embodiment of the present invention, in S200, low-temperature freezing operation is implemented by using liquid nitrogen or dry ice, or low-temperature freezing equipment is used to implement low-temperature freezing operation; liquid nitrogen or dry ice freezing can be implemented by atomization, spraying or soaking process;
[0020] And / or in S300, vacuum freeze-drying treatment is implemented by using a vacuum freeze-drying equipment, and normal-temperature air-drying treatment is implemented by using a normal-temperature air-blowing drying tunnel.
[0021] In a specific embodiment of the present invention, in S200, the fiber dispersion is sealed in a non-woven fabric bag, and then the non-woven fabric bag is loaded into the prefabricated mold.
[0022] The vacuum insulation panel provided by the present invention includes a film material, as well as a core material, a desiccant, and a getter encapsulated within the film material. Among them, the core material is prepared through a low-temperature freezing molding step and a vacuum freeze-drying step from an aqueous solution of an organic material and a light-shielding agent. Based on the above method, not only the problems of shrinkage of organic fibers and a decrease in porosity during high-temperature baking of the core material during molding are avoided, but also the problem of hot-melt bonding of the low-melting-point fiber core material due to high-temperature baking is avoided. As a result, the vacuum insulation panel has a low thermal conductivity, and the thermal conductivity reaches or approaches the theoretical value. At the same time, by using a light-shielding agent and a dispersant, and cooperating with rapid low-temperature freezing operation, the dispersion uniformity of the organic fibers and the light-shielding agent can be ensured, and thus the problem of poor dispersion performance during the mixing of fibers and powders is effectively solved. In addition, the preparation method of the above core material is a low-temperature preparation method, so the sources of organic fiber materials can be further expanded, and organic fibers with high melting points and low melting points can be used for the preparation of the core material, thereby effectively controlling the cost of the vacuum insulation panel. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0024] Figure 1 It is a schematic structural diagram of the film material in an embodiment of the present invention;
[0025] Figure 2 It is a schematic structural diagram of the vacuum insulation panel after the sealing edge is folded in an embodiment of the present invention;
[0026] Figure 3 It is a schematic cross-sectional structural diagram of the film material in an embodiment of the present invention;
[0027] Figure 4 It is a flowchart of the preparation method in an embodiment of the present invention.
[0028] DESCRIPTION OF THE REFERENCE NUMERALS:
[0029] 100 - Vacuum insulation panel;
[0030] 10 - Film material, 20 - Core material, 30 - Getter, 40 - Desiccant, 50 - Sealing edge, 60 - Connector. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0031] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.
[0032] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a," "an," and "the" as used herein may also include the plural forms. The terms "comprises," "comprising," "includes," and "having" are inclusive and thus specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. Method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless explicitly indicated as the order of performance. It should also be understood that additional or alternative steps may be used.
[0033] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms when used herein do not imply an order or sequence. Thus, a first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings of the example embodiments.
[0034] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over" and the like. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, the element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" another element or feature. Thus, the exemplary term "below" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.
[0035] In a first aspect of the present invention, a vacuum insulation panel 100 is provided. The vacuum insulation panel 100 is applied to the low-temperature cold insulation industry, for example, applied to refrigerators. Specifically, the vacuum insulation panel 100 is installed in the side panel, back panel or door panel of the refrigerator and is used to reduce the heat transfer at the corresponding position, thereby achieving the heat insulation effect.
[0036] Specifically, referring to Figures 1 - 3 As shown, the vacuum insulation panel 100 provided by the embodiment of the present invention includes a core material 20, a desiccant 40, a getter 30 and a film material 10. The film material 10 is in a bag shape, and the core material 20, the desiccant 40 and the getter 30 are vacuum packaged in the film material 10; wherein the core material 20 includes organic fibers, a dispersant and a light-shielding agent. The organic fibers, the dispersant and the light-shielding agent are mixed with water to obtain a fiber dispersion liquid, and the fiber dispersion liquid is prepared into the core material 20 through a low-temperature freezing molding step and a vacuum freeze-drying step.
[0037] According to the vacuum insulation panel 100 provided by the embodiment of the present invention, since its core material 20 is prepared by a low-temperature freezing molding step and a vacuum freeze-drying step from an aqueous solution of an organic material and a light-shielding agent, based on the above method, not only the problems of shrinkage of organic fibers and decrease in porosity during high-temperature baking of the core material 20 are avoided, but also the problem of hot melt adhesion of the fiber core material 20 with a low melting point due to high-temperature baking is avoided. Therefore, not only the safety of the production process is improved, but also the vacuum insulation panel 100 has a low thermal conductivity, and the thermal conductivity reaches or approaches the theoretical value. At the same time, by using a light-shielding agent and a dispersant and cooperating with rapid low-temperature freezing operation, the dispersion uniformity of the organic fibers and the light-shielding agent can be ensured, thereby effectively solving the problem of poor dispersion performance during the mixing of fibers and powders. In addition, the preparation method of the above core material 20 is a low-temperature preparation method, so the source of organic fiber materials can be further expanded, and organic fibers with high melting points and low melting points can be used for the preparation of the core material 20, thereby effectively controlling the cost of the vacuum insulation panel 100.
[0038] It should be noted that the core material 20 is formed into a rectangular plate-like structure, and a receiving groove or a receiving hole for accommodating the desiccant 40 and the getter 30 may be provided thereon. The getter 30 can be a conventional metal and its alloy, such as Group IIA metals (barium, strontium, magnesium, calcium) and their alloys, Group IVB metals (titanium, zirconium, hafnium), thorium, rare earth metals and their alloys. The desiccant 40 can be calcium chloride or calcium sulfate, etc. The getter 30, the desiccant 40 and the core material 20 are vacuum-packaged together inside the film material 10. The getter 30 is used to absorb the residual oxygen released by the film material 10 and the core material 20 during use, and the desiccant 40 is used to absorb moisture, so as to ensure the vacuum degree of the vacuum insulation panel 100.
[0039] In some embodiments, the film material 10 may include any one or a combination of two or more of an aluminum-plastic composite film, an aluminized film, a transparent film, etc., but is not limited thereto. When the film material 10 includes a variety of the above-mentioned aluminum-plastic composite film, aluminized film, and transparent film, adjacent film materials 10 are connected by adhesive bonding.
[0040] In one embodiment, the organic fiber includes one or several of polyester, acrylic, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber (UHMWPE fiber), poly(p-phenylene benzobisoxazole) fiber (PBO fiber), poly(p-benzimidazole) fiber (PBI fiber), poly(p-phenylene pyridino bisimidazole) fiber (M5 fiber), polyimide fiber (PI fiber).
[0041] Since the core material 20 is prepared by a processing method of rapid dispersion freezing and vacuum freeze-drying without using a high-temperature baking processing method, high-melting-point and low-melting-point organic fibers can be used to prepare the core material 20, so the material selection range of the organic fibers in the core material 20 can be expanded, and then it can be formed into the above range. During application, a single organic fiber material can be selected from the above range, or two or more organic fibers can also be selected.
[0042] The above materials can be obtained through commercial purchase or through recycling. Among them, obtaining through recycling is conducive to realizing the recycling of organic fiber materials.
[0043] In a specific embodiment of the present invention, the diameter of the organic fiber is 5-60 μm, and / or the length of the organic fiber is 5-45 μm. Specifically, the diameter of the organic fiber can be any value in 5-60 μm such as 6 μm, 8 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc. Preferably, the diameter of the organic fiber is 45 μm. The length of the organic fiber can be any value in 5-45 μm such as 6 μm, 8 μm, 10 μm, 20 μm, 30 μm, 40 μm, etc. Preferably, the length of the organic fiber is 35 μm.
[0044] In a specific embodiment of the present invention, the light-shielding agent is nano-titanium dioxide or nano-carbon black. The light-shielding agent can reduce the heat radiation heat transfer ability of the vacuum insulation panel 100, thereby further reducing the thermal conductivity of the vacuum insulation panel 100.
[0045] In a specific embodiment of the present invention, the mass percentage of the light-shielding agent is 0.1%-5%, the dosage of the dispersant is 0.05%-10%, and the rest is organic fiber.
[0046] In a specific embodiment of the present invention, the number of the core materials 20 is one or more, and when the number of the core materials 20 is multiple, the multiple core materials 20 are stacked. Further, the thicknesses of the multiple stacked core materials 20 can be the same or different, and can be specifically selected according to actual applications.
[0047] Refer to Figure 4 , the second aspect of the present invention also provides a preparation method of the vacuum insulation panel 100, which can be used to prepare the vacuum insulation panel 100 in any of the above embodiments. Specifically, the preparation method includes the following steps.
[0048] S100: Add a predetermined amount of organic fiber into an aqueous solution mixed with a predetermined amount of dispersant and light-shielding agent and mix evenly to obtain a fiber dispersion.
[0049] Prepare the organic fiber, light-shielding agent and dispersant according to the number of the core materials 20 to be prepared, wherein the mass percentage of the light-shielding agent is 0.1%-5%, the dosage of the dispersant is 0.05%-10%, and the rest is organic fiber. Determine the amount of water according to the total volume of the core materials 20 to ensure that the volume of the mixed fiber dispersion is basically the same as the total volume of the core materials 20.
[0050] Put the above light-shielding agent and dispersant into a stirring kettle filled with water and stir evenly, and then pour the organic fiber into the above-mentioned uniformly mixed aqueous solution, and continue to stir until the organic fiber and the light-shielding agent are evenly dispersed to obtain a uniformly dispersed fiber dispersion.
[0051] The stirrer in the stirring kettle can be a flat blade stirrer, a folded blade or a spiral blade. During stirring, a stirring kettle with any one of the above stirrers can be used alone for stirring and dispersing the materials, or two or more stirrers can be used for continuous dispersion in multiple stirring kettles.
[0052] S200: Pour the obtained fiber dispersion into a prefabricated mold and freeze it at a low temperature to obtain an intermediate.
[0053] Specifically, the prefabricated mold is customized according to the specific structure of the vacuum insulation panel 100, and is formed into a conventional cube or cuboid-shaped plate structure, and its height is greater than the height of the vacuum insulation panel 100. Usually, a protruding structure for defining grooves and / or holes on the core material 20 is also provided in the prefabricated mold.
[0054] Pour the fiber dispersion liquid into the prefabricated mold, and adjust the thickness of the core material 20 by controlling the weight of the fiber dispersion liquid. Then, a low-temperature freezing operation is performed to freeze the fiber dispersion liquid into a formed intermediate piece.
[0055] The low-temperature freezing operation can be implemented using liquid nitrogen or dry ice. Specifically, the prefabricated mold carrying the fiber dispersion liquid can be placed in the atomized environment of liquid nitrogen or dry ice, or liquid nitrogen or dry ice can be sprayed into the prefabricated mold carrying the fiber dispersion liquid, or the prefabricated mold carrying the fiber dispersion liquid can be immersed in liquid nitrogen or dry ice.
[0056] The low-temperature freezing operation can also be implemented using a low-temperature freezing device. Specifically, the prefabricated mold carrying the fiber dispersion liquid can be placed in the low-temperature freezing device, and the low-temperature freezing device can be started to achieve low-temperature freezing.
[0057] The low-temperature freezing duration is not less than 2 minutes, so as to ensure that the fiber dispersion liquid in the prefabricated mold is completely frozen.
[0058] Furthermore, a non-woven fabric bag can be set, and the fiber dispersion liquid is sealed in the non-woven fabric bag, and then the non-woven fabric bag is placed in the prefabricated mold for low-temperature freezing and forming. In this way, the flow of the fiber dispersion liquid can be restricted by the non-woven fabric, so as to facilitate subsequent operations.
[0059] S300: The obtained intermediate piece is subjected to vacuum freeze-drying treatment and normal-temperature air drying treatment in sequence to obtain the core material 20.
[0060] The intermediate piece and the prefabricated mold are placed together in a vacuum freeze-drying device for drying, and the drying time is 30 - 120 min. The vacuum freeze-drying device includes a vacuum pump, a buffer kettle, a refrigerator and a condenser. Among them, the buffer kettle is used to form a sealed space for placing the prefabricated mold, the vacuum pump is used to evacuate the buffer kettle, and the refrigerator and the condenser are used for freeze-drying. Preferably, the coil in the condenser is a spiral condensation coil, so as to improve the freezing efficiency.
[0061] The vacuum freeze-drying device uses the sublimation principle to directly sublimate the pre-frozen moisture in the intermediate piece into water vapor and remove it without passing through the melting of ice during the vacuum freeze-drying process, so as to achieve the purpose of drying. When drying at a low temperature, the volume of the intermediate piece hardly changes, maintaining the original structure and not collapsing.
[0062] The intermediate product after drying passes through a normal-temperature air-blowing drying tunnel by means of a conveying device to further remove volatile substances, thereby obtaining the core material 20. Before entering the normal-temperature air-blowing drying tunnel, the core material 20 needs to be separated from the prefabricated mold to ensure the air-drying effect.
[0063] S400: Load the obtained core material 20 into the film material 10 formed into a film bag shape, evacuate to a preset vacuum degree, and then keep the pressure and heat-seal to obtain the vacuum insulation panel 100.
[0064] First, the bag-shaped film material 10 is manufactured. Specifically, the film materials 10 arranged in opposite layers are pressurized and heated by a heat-sealing device to form a sealing folded edge 50, thereby manufacturing a film bag with at least one opening. Then, the dried core material 20, the getter 30, and the desiccant 40 are loaded into the film bag by an automatic bagging machine, evacuated, and heat-sealed to obtain the vacuum insulation panel 100.
[0065] Preferably, the automatic bagging machine is an automatic pressure clamping plate type automatic bagging machine, which is easy to load the fluffy core material 20 into the bag.
[0066] Furthermore, the sealing folded edge 50 can be folded towards the same side of the vacuum insulation panel 100, and the sealing folded edges 50 are connected to each other through a connecting member 60 to fix the sealing folded edges 50 on the same side of the vacuum insulation panel 100. The side of the vacuum insulation panel 100 where the sealing folded edge 50 is fixed is the non-connection surface, and the other side opposite to the non-connection surface is the connection surface. The vacuum insulation panel 100 is installed on the door panel or box body of the electrical equipment through the connection surface.
[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A vacuum insulation panel, characterized in that, It includes a core material, a desiccant, a getter, and a film material. The film material is in a bag shape, and the core material, the desiccant, and the getter are vacuum packaged inside the film material; wherein The core material includes organic fibers, a dispersant, and a light-shielding agent. The organic fibers, the dispersant, and the light-shielding agent are mixed with water to obtain a fiber dispersion liquid, and the fiber dispersion liquid is prepared into the core material through a low-temperature freezing molding step and a vacuum freeze-drying step.
2. The vacuum insulation panel according to claim 1, characterized in that, The organic fibers include one or more of polyester, acrylic, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber, poly(p-phenylene benzobisoxazole) fiber, polybenzimidazole fiber, poly(p-phenylene pyridobisimidazole) fiber, and polyimide fiber.
3. The vacuum insulation panel according to claim 1, wherein, The diameter of the organic fibers is 5 - 60 μm, and / or the length of the organic fibers is 5 - 45 μm.
4. The vacuum insulation panel according to claim 1, characterized in that, The light-shielding agent is nano-titanium dioxide or nano-carbon black.
5. The vacuum insulation panel according to claim 1, characterized in that, The mass percentage of the light-shielding agent is 0.1% - 5%, the dosage of the dispersant is 0.05% - 10%, and the rest is the organic fibers.
6. The vacuum insulation panel according to claim 1, characterized in that, The number of the core materials is one or more. When the number of the core materials is multiple, the multiple core materials are stacked.
7. A method for preparing a vacuum insulation panel according to any one of claims 1-6, characterized in that, It includes: S100: Add a predetermined amount of organic fibers into an aqueous solution mixed with a predetermined amount of a dispersant and a light-shielding agent and mix evenly to obtain a fiber dispersion liquid; S200: Pour the obtained fiber dispersion liquid into a prefabricated mold and freeze it at a low temperature to obtain an intermediate; S300: Perform vacuum freeze-drying treatment and normal-temperature air drying treatment on the obtained intermediate in sequence to obtain the core material; S400: Put the obtained core material into a film material formed into a film bag shape, evacuate to a preset vacuum degree and then perform pressure-holding heat sealing to obtain the vacuum insulation panel.
8. The method for preparing a vacuum insulation panel according to claim 7, characterized in that, In S100, the organic fibers, the dispersant, and the light-shielding agent are mixed evenly by a stirring kettle, and a flat blade stirrer, a pitched blade stirrer, or a helical blade stirrer is provided in the stirring kettle.
9. The preparation method of the vacuum insulation panel according to claim 7, characterized in that, In S200, liquid nitrogen or dry ice is used to perform low-temperature freezing operation, or a low-temperature freezing device is used to perform low-temperature freezing operation; liquid nitrogen or dry ice freezing can be implemented through atomization, spraying, or soaking process; and / or In S300, a vacuum freeze-drying device is used to perform vacuum freeze-drying treatment, and a normal-temperature air drying tunnel is used to perform normal-temperature air drying treatment.
10. The preparation method of the vacuum insulation panel according to claim 7, characterized in that, In S200, the fiber dispersion liquid sealing device is put into a non-woven fabric bag, and then the non-woven fabric bag is put into the prefabricated mold.