Film material for vacuum insulation panel, and vacuum insulation panel

Abstract

The present application relates to the technical field of thermal insulation, and in particular to a film material for a vacuum insulation panel, and a vacuum insulation panel. The film material for a vacuum insulation panel comprises a modified heat sealing layer, a modified barrier layer, and a modified protective layer that are stacked. The modified heat sealing layer comprises a heat sealing substrate and an elastomer; the modified barrier layer comprises a barrier substrate and an elastomer; and the modified protective layer comprises a protective substrate and an elastomer. The film material for a vacuum insulation panel provided by the present application has high toughness while retaining high barrier properties, thereby solving the problem of poor bending resistance of film materials for a vacuum insulation panel.

Description

Membrane materials for vacuum insulation panels and vacuum insulation panels

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411745291.7, filed on November 29, 2024, entitled “Membrane Material for Vacuum Insulation Panel and Vacuum Insulation Panel”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of thermal insulation technology, and specifically relates to a membrane material for vacuum insulation panels and a vacuum insulation panel. Background Technology

[0004] Refrigerator insulation plays a crucial role in the development of energy-efficient refrigerators, and vacuum insulation panels (VIPs), due to their high thermal resistance, can further reduce the energy consumption of traditional polyurethane foam refrigerators. Traditional VIPs typically consist of a porous core material with openings, which is evacuated and sealed in a membrane bag to maintain the required vacuum level. The barrier material of the VIP is usually a four- to five-layer polymer composite film, effectively blocking water vapor and oxygen from entering the interior, thus reducing insulation capacity. Currently, the substrate of the barrier film can be divided into a protective layer, a barrier layer, and a heat-sealing layer, and the substrates of the protective layer, barrier layer, and heat-sealing layer are all plastic. This results in the barrier film having high rigidity and poor bending resistance, making it prone to cracking during folding, leading to micro-leakage in the vacuum insulation panel. Current solutions involve adding a rubber layer to the plastic layers to improve the material's toughness. However, the addition of the rubber layer significantly reduces the barrier properties of the film, and the rubber-based film has poor film-forming properties, making it difficult to manufacture.

[0005] Therefore, this application is submitted to address the above shortcomings.

[0006] Application content

[0007] The purpose of this application is to provide a membrane material for vacuum insulation panels and a vacuum insulation panel to address at least some of the aforementioned technical problems.

[0008] The first aspect of this application provides a membrane material for vacuum insulation panels, comprising a modified heat-sealing layer, a modified barrier layer, and a modified protective layer stacked together, wherein the modified heat-sealing layer comprises a heat-sealing substrate and an elastomer, the modified barrier layer comprises a barrier substrate and an elastomer, and the modified protective layer comprises a protective substrate and an elastomer.

[0009] The membrane material for vacuum insulation panels provided in this application may also have the following additional technical features:

[0010] In one specific embodiment of this application, the elastomer includes one of ethylene propylene diene monomer (EPDM), ethylene propylene diene monomer (EPDM), and ethylene-octene copolymer.

[0011] In one specific embodiment of this application, the heat-sealing substrate comprises polyethylene or polypropylene, and / or the mass ratio of the heat-sealing substrate to the elastomer is 100:(1-10).

[0012] In one specific embodiment of this application, the protective substrate comprises any one or a combination of two of the following: polyimide, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, liquid crystal polymer, polyamide, polyetherimide, polyamide-imide, polyphenylene sulfone, polyethersulfone, and polysulfone; and / or

[0013] The mass ratio of the protective substrate to the elastomer is 100:(1-10).

[0014] In one specific embodiment of this application, the barrier substrate comprises polyethylene terephthalate and ethylene-vinyl alcohol copolymer. The polyethylene terephthalate and the elastomer are blended and aluminized to obtain a modified aluminized polyethylene terephthalate layer. The ethylene-vinyl alcohol copolymer and the elastomer are blended and aluminized to obtain a modified aluminized ethylene-vinyl alcohol copolymer layer. The modified aluminized polyethylene terephthalate layer and the modified aluminized ethylene-vinyl alcohol copolymer layer are stacked together to form the modified barrier layer; and / or

[0015] The mass ratio of the barrier substrate to the elastomer is 100:(1-10).

[0016] In one specific embodiment of this application, the thickness of the modified heat-sealing layer, the modified barrier layer, and the modified protective layer is 1-2000 μm, and an adhesive layer is provided between the modified heat-sealing layer, the modified barrier layer, and the modified protective layer, the thickness of which is 1-2000 μm.

[0017] In one specific embodiment of this application, the thickness of the modified heat-sealing layer is 20-200 μm.

[0018] A second aspect of this application also provides a vacuum insulation panel, comprising a getter, a composite core material, and a membrane material as described in any one of the above, wherein the membrane material is in the form of a bag, and the getter and the composite core material are vacuum-encapsulated within the membrane material.

[0019] A second aspect of this application also provides a method for preparing the aforementioned vacuum insulation panel, comprising the following steps:

[0020] A membrane material is prepared by stacking a modified heat-sealing layer, a modified barrier layer, and a modified protective layer.

[0021] A membrane material is used to support a membrane bag, wherein the modified heat-sealing layer serves as the inner surface of the membrane bag;

[0022] The composite core material and getter are placed into the membrane bag, and after vacuuming, the composite core material and getter are vacuum sealed in the membrane bag by a hot pressing process.

[0023] In one specific embodiment of this application, the modified heat-sealing layer is obtained by extruding and granulating the elastomer and heat-sealing substrate and blowing film; the modified barrier layer is obtained by extruding and granulating the elastomer and barrier substrate and blowing film with aluminum plating; and the modified protective layer is obtained by extruding and granulating the elastomer and protective substrate and blowing film.

[0024] This application modifies the heat-sealing layer, barrier layer, and protective layer by adding elastomers to the plastic substrates corresponding to these layers, forming rubber-plastic blends. This modification results in modified heat-sealing layers, modified barrier layers, and modified protective layers. The modified heat-sealing layers, modified barrier layers, and modified protective layers exhibit significantly enhanced bending resistance due to the presence of elastomers. Furthermore, because the amount of elastomer added is relatively small, the barrier properties of the composite film are essentially not compromised. Therefore, the vacuum insulation panel membrane material provided by this application retains high barrier properties while also possessing high toughness, thus solving the problem of poor bending resistance in vacuum insulation panel membrane materials.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0028] Figure 1 is a schematic diagram of the structure of the vacuum insulation panel in the embodiment of this application;

[0029] Figure 2 is a schematic cross-sectional view of the membrane material used in the vacuum insulation panel in an embodiment of this application;

[0030] Figure 3 is a schematic diagram of the structure of the vacuum insulation panel in the embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 100-vacuum insulation panel, 10-membrane material, 20-composite core material, 30-getter; 11-modified heat-sealing layer, 12-modified protective layer, 13-modified barrier layer, 131-modified aluminized polyethylene terephthalate layer, 132-modified aluminized ethylene-vinyl alcohol copolymer layer, 133-aluminum coating, 134-modified polyethylene terephthalate layer, 135-modified ethylene-vinyl alcohol copolymer layer, 14-sealing edge, 15-connector. Detailed Implementation

[0032] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0033] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0034] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0035] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0036] The vacuum insulation panel 100 of some embodiments of this application is described below with reference to FIG1-3. The vacuum insulation panel 100 can be used in heat insulation devices. Specifically, heat insulation devices include refrigerators, heat preservation boxes, water heaters, microwave ovens, containers, and building wall panels.

[0037] As shown in Figure 1, the vacuum insulation panel 100 includes a getter 30, a composite core material 20, and a membrane material 10. The membrane material 10 is bag-shaped, and the getter 30 and the composite core material 20 are vacuum-sealed inside the membrane material 10. The getter 30 is used to absorb residual oxygen released by the membrane material 10 and the composite core material 20 during use, ensuring the vacuum level inside the vacuum insulation panel 100.

[0038] The composite core material 20 can be a rectangular block structure, and the corresponding membrane material 10 can be rectangular. The composite core material 20 is located in the middle of the membrane material 10, and the getter 30 is located at the label position of the composite core material 20. After vacuum hot pressing, the membrane material 10 covering the composite core material 20 forms a sealing fold 14 around its outer periphery. This sealing fold 14 is folded toward one side of the vacuum insulation board 100 and fixed to the side of the vacuum insulation board 100 by the connector 15, so as to ensure that the sealing side remains flat on the side of the vacuum insulation board 100.

[0039] In this embodiment, as shown in FIG2, the film material 10 may include a modified heat-sealing layer 11, a modified barrier layer 13, and a modified protective layer 12 stacked together. The modified heat-sealing layer 11 includes a heat-sealing substrate and an elastomer, the modified barrier layer 13 includes a barrier substrate and an elastomer, and the modified protective layer 12 includes a protective substrate and an elastomer.

[0040] It should be noted that the heat-sealing layer, barrier layer, and protective layer of the traditional membrane material 10 only include the corresponding substrate and do not include the elastomer. This results in the membrane material 10 having high rigidity but poor bending resistance, making it prone to cracking during the subsequent sealing and folding process 14, which leads to micro-leakage in the vacuum insulation panel 100. In contrast, this application adds elastomers to the plastic substrates corresponding to the heat-sealing layer, barrier layer, and protective layer, respectively, so that the heat-sealing layer, barrier layer, and protective layer form a rubber-plastic blend. This modifies the heat-sealing layer, barrier layer, and protective layer to obtain a modified heat-sealing layer 11, a modified barrier layer 13, and a modified protective layer 12. Furthermore, the modified heat-sealing layer 11, modified barrier layer 13, and modified protective layer 12 have significantly enhanced bending resistance due to the presence of elastomers. At the same time, since the amount of elastomer added is small, the barrier performance of the composite membrane is basically not lost. The membrane material 10 for the vacuum insulation panel 100 provided in this application retains high barrier properties while also having high toughness, thus solving the problem of poor bending resistance of the membrane material 10 for the vacuum insulation panel 100.

[0041] Specifically, in the membrane bag formed by the aforementioned membrane material 10, the heat-sealing layer is located on the inner side of the membrane bag while the protective layer is located on the outer side of the membrane bag.

[0042] Furthermore, the getter 30 can be made of conventional metals and their alloys, 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.

[0043] Furthermore, the composite core material 20 may be made of inorganic fibers and / or organic fibers, wherein the inorganic fibers may include glass fibers, silicon dioxide, etc., and the organic fibers may include at least one of polyester fibers, polyethylene fibers, polypropylene fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, polystyrene fibers, polylactic acid fibers, etc.

[0044] In one specific embodiment of this application, the elastomer includes one of ethylene propylene diene monomer (EPDM), ethylene propylene diene monomer (EPDM), and ethylene-octene copolymer. Exemplarily, the elastomer is EPDM. Exemplarily, the elastomer is ethylene propylene diene monomer (EPDM). Exemplarily, the elastomer is ethylene-octene copolymer.

[0045] The aforementioned EPDM rubber, DIDM rubber, and ethylene-octene copolymer all possess good elastic properties. They can be blended with heat-sealing substrates, heat-insulating substrates, and protective substrates, respectively, to modify them, thereby ultimately forming a modified heat-sealing layer 11, a modified barrier layer 13, and a modified protective layer 12 with high toughness. Furthermore, these materials are widely available and relatively inexpensive, thus avoiding excessively increasing the material cost of the membrane material 10, and thereby promoting its widespread application.

[0046] In one embodiment, the heat-sealing substrate comprises polyethylene or polypropylene. Exemplarily, the heat-sealing substrate comprises polyethylene. Exemplarily, the heat-sealing substrate comprises polypropylene. Specifically, polyethylene and polypropylene have low melting points, allowing them to partially melt and adhere to the composite core material 20 during subsequent vacuum heat sealing of the vacuum insulation panel 100, thereby improving the bond strength between the membrane material 10 and the composite core material 20.

[0047] In one embodiment, the mass ratio of the heat-sealing substrate to the elastomer is 100:(1-10). For example, the mass ratio of the heat-sealing substrate to the elastomer can be any value between 100:(1-10), such as 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10, etc. The basic properties of the modified heat-sealing layer 11 originate from the heat-sealing substrate, while its toughness comes from the elastomer. If the mass ratio of the heat-sealing substrate in the processed material is too high, the toughness increases while the basic properties decrease. If the mass ratio of the heat-sealing substrate in the processed material is too low, the toughness decreases. Therefore, only when the mass ratio of the heat-sealing substrate to the elastomer is within the above range can the basic properties and toughness of the heat-sealing layer be simultaneously considered, thereby improving the performance of the modified heat-sealing layer 11.

[0048] In one embodiment, the protective substrate includes any one or a combination of two of polyimide, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, liquid crystal polymer, polyamide, polyetherimide, polyamide-imide, polyphenylene sulfone, polyethersulfone, and polysulfone. Exemplarily, the protective substrate is polyamide. Exemplarily, the protective substrate includes polyimide, etc.

[0049] Furthermore, the mass ratio of the protective substrate to the elastomer is 100:(1-10). For example, the mass ratio of the protective substrate to the elastomer can be any value between 100:(1-10), such as 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10, etc. Only when the mass ratio of the protective substrate to the elastomer is within the above range can the modified protective layer 12 simultaneously achieve both toughness and protective properties, thereby improving the performance of the modified protective layer 12.

[0050] In one embodiment, the barrier substrate includes polyethylene terephthalate and ethylene-vinyl alcohol copolymer. The polyethylene terephthalate and elastomer are blended and aluminum-plated to obtain a modified aluminum-plated polyethylene terephthalate layer 131. The ethylene-vinyl alcohol copolymer and elastomer are blended and aluminum-plated to obtain a modified aluminum-plated ethylene-vinyl alcohol copolymer layer 132. The modified aluminum-plated polyethylene terephthalate layer 131 and the modified aluminum-plated ethylene-vinyl alcohol copolymer layer 132 are stacked to form a modified barrier layer 13.

[0051] In one embodiment, the mass ratio of the barrier substrate to the elastomer is 100:(1-10). Specifically, the mass ratio of the polyethylene terephthalate layer to the elastomer is 100:(1-10). For example, the mass ratio of polyethylene terephthalate to the elastomer is any value between 100:(1-10), such as 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10, etc., and the modified polyethylene terephthalate layer 134 is prepared by blending polyethylene terephthalate and the elastomer. The mass ratio of the ethylene-vinyl alcohol copolymer to the elastomer is 100:(1-10). For example, a modified ethylene-vinyl alcohol copolymer layer 135 is prepared by blending ethylene-vinyl alcohol copolymer and elastomer in any mass ratio between 100:(1-10), such as 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10, etc.

[0052] Subsequently, the modified polyethylene terephthalate layer 134 and the modified ethylene-vinyl alcohol copolymer layer 135 are subjected to a vacuum electroplating process to form an aluminum coating 133, thus obtaining a modified aluminum-coated polyethylene terephthalate layer 131 and a modified aluminum-coated ethylene-vinyl alcohol copolymer layer 132. The modified aluminum-coated polyethylene terephthalate layer 131 and the modified aluminum-coated ethylene-vinyl alcohol copolymer layer 132 are then stacked to obtain a modified barrier layer 13. Optionally, the two layers can be stacked by bonding with an adhesive layer.

[0053] In one embodiment, the modified heat-sealing layer 11, the modified barrier layer 13, and the modified protective layer 12 have a thickness of 1-2000 μm, and an adhesive layer with a thickness of 1-2000 μm is provided between each of the modified heat-sealing layer 11, the modified barrier layer 13, and the modified protective layer 12. For example, the thickness of the modified heat-sealing layer 11, the modified barrier layer 13, and the modified protective layer 12 can be 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, 500 μm, 800 μm, 1000 μm, 1500 μm, 1800 μm, or 2000 μm.

[0054] Furthermore, in the modified barrier layer 13, the thickness ratio of the modified aluminized polyethylene terephthalate layer 131 to the modified aluminized ethylene-vinyl alcohol copolymer layer 132 is 1:(0.2-5). Specifically, the ratio of the modified aluminized polyethylene terephthalate layer 131 to the modified aluminized ethylene-vinyl alcohol copolymer layer 132 can be any value between 1:(0.2-5), such as 1:0.2, 1:0.5, 1:0.8, 1:1, 1:2, 1:5, etc. In the modified aluminized polyethylene terephthalate layer 131 or the modified aluminized ethylene-vinyl alcohol copolymer layer 132, the thickness ratio of the aluminum coating 133 to its total thickness can be any value between 1:(1-50).

[0055] In one embodiment, the thickness of the modified heat-sealing layer 11 is 20-200 μm. Further, the thickness of the modified heat-sealing layer 11 is preferably 50 μm, the thickness of the modified barrier layer 13 is preferably 20 μm, the thickness of the modified protective layer 12 is preferably 50 μm, and the thickness of the adhesive layer is preferably μm.

[0056] A second aspect of this application also provides a method for preparing a vacuum insulation panel 100, comprising the following steps:

[0057] A membrane material 10 is prepared by stacking a modified heat-sealing layer 11, a modified barrier layer 13, and a modified protective layer 12.

[0058] The membrane material 10 supports the membrane material 10 bag, wherein the modified heat-sealing layer 11 serves as the inner surface of the membrane material 10 bag;

[0059] The composite core material 20 and the getter 30 are packed into the membrane material 10 bag, and after vacuuming, the composite core material 20 and the getter 30 are vacuum sealed in the membrane material 10 bag by hot pressing.

[0060] In one specific embodiment of this application, the modified heat-sealing layer 11 is obtained by extruding, granulating, and blowing film the elastomer and heat-sealing substrate; the modified barrier layer 13 is obtained by extruding, granulating, blowing film, and aluminum plating the elastomer and barrier substrate; and the modified protective layer 12 is obtained by extruding, granulating, and blowing film the elastomer and protective substrate.

[0061] Specifically, the elastomer and other substrates are extruded and granulated using a twin-screw extruder. In the preparation of the modified heat-sealing layer 11, a predetermined mass ratio of heat-sealing substrate and elastomer is added to the twin-screw extruder, and extruded and granulated at a temperature of 160-180℃ and a rotation speed of 100-400 rpm, followed by blown film formation. In the preparation of the modified protective layer 12, a predetermined mass ratio of protective layer and elastomer is added to the twin-screw extruder, and extruded and granulated at a temperature of 230-250℃ and a rotation speed of 100-400 rpm, followed by blown film formation. During the preparation of the barrier layer, a modified aluminized polyethylene terephthalate layer 131 and a modified aluminized ethylene-vinyl alcohol copolymer layer 132 are prepared separately. Specifically, a predetermined mass ratio of polyethylene terephthalate and elastomer is added to a twin-screw extruder, and the mixture is extruded and granulated at a temperature of 290-310℃ and a speed of 100-400 rpm. Then, the mixture is biaxially stretched and vacuum-metallized to form the modified aluminized polyethylene terephthalate layer 131. A predetermined mass ratio of ethylene-vinyl alcohol copolymer and elastomer is added to a twin-screw extruder, and the mixture is extruded and granulated at a temperature of 210-240℃ and a speed of 100-400 rpm. Then, the mixture is biaxially stretched and vacuum-metallized to form the modified aluminized ethylene-vinyl alcohol copolymer layer 132.

[0062] To further illustrate the above solution, this application also provides the following embodiments:

[0063] Example 1:

[0064] 100 parts by weight of nylon and 1 part by weight of EPDM rubber were added to a twin-screw extruder and extruded, granulated, and blown into film at 230°C and 200 rpm. 100 parts by weight of ethylene terephthalate and 1 part by weight of EPDM rubber were added to a twin-screw extruder and extruded, granulated, blown into film, and vacuum-metallized at 290°C and 200 rpm. 100 parts by weight of ethylene-vinyl alcohol copolymer and 1 part by weight of EPDM rubber were added to a twin-screw extruder and extruded, granulated, blown into film, and vacuum-metallized at 210°C and 200 rpm. 100 parts by weight of polyethylene and 1 part by weight of EPDM rubber were added to a twin-screw extruder and extruded, granulated, and blown into film at 160°C and 200 rpm. The above composite films were then processed into a four-layer composite film to obtain film material 10.

[0065] Example 2:

[0066] Except that the mass ratio of heat-sealing substrate to elastomer is 100:2, the mass ratio of protective substrate to elastomer is 100:2, and the mass ratio of barrier substrate to elastomer is 100:2, everything else is the same as in the example.

[0067] Example 3:

[0068] Except that the mass ratio of heat-sealing substrate to elastomer is 100:5, the mass ratio of protective substrate to elastomer is 100:5, and the mass ratio of barrier substrate to elastomer is 100:5, everything else is the same as in the example.

[0069] Example 4:

[0070] Except for the elastomer being ethylene propylene diene monomer (EPDM) rubber, everything else is the same as in Example 1.

[0071] Example 5:

[0072] Except for the elastomer being an ethylene-octene copolymer, everything else is the same as in Example 1.

[0073] Comparative Example 1:

[0074] Except for the absence of elastomers, everything else is the same as in the example.

[0075] The oxygen permeability, water vapor permeability, tensile strength, and elongation at break of membrane material 10 in the above embodiments and comparative examples were tested, and the measured data are shown in the table below:

[0076] As shown in the table above, adding elastomers to the substrates of the heat-sealing layer, barrier layer, and protective layer can significantly improve the toughness of the material while maintaining its barrier properties.

[0077] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A membrane material for vacuum insulation panels, wherein, The invention includes a modified heat-sealing layer, a modified barrier layer, and a modified protective layer stacked together. The modified heat-sealing layer includes a heat-sealing substrate and an elastomer, the modified barrier layer includes a barrier substrate and an elastomer, and the modified protective layer includes a protective substrate and an elastomer.

2. The membrane material for vacuum insulation panels according to claim 1, wherein, The elastomer includes one of ethylene propylene diene monomer (EPDM), ethylene propylene diene monomer (EPDM), and ethylene-octene copolymer.

3. The membrane material for vacuum insulation panels according to claim 1, wherein, The heat-sealing substrate comprises polyethylene or polypropylene, and / or the mass ratio of the heat-sealing substrate to the elastomer is 100:(1-10).

4. The membrane material for vacuum insulation panels according to claim 1, wherein, The protective substrate comprises any one or a combination of two of the following: polyimide, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, liquid crystal polymer, polyamide, polyetherimide, polyamide-imide, polyphenylene sulfone, polyethersulfone, and polysulfone; and / or The mass ratio of the protective substrate to the elastomer is 100:(1-10).

5. The membrane material for vacuum insulation panels according to claim 1, wherein, The barrier substrate comprises polyethylene terephthalate and ethylene-vinyl alcohol copolymer. The polyethylene terephthalate and the elastomer are blended and aluminized to obtain a modified aluminized polyethylene terephthalate layer. The ethylene-vinyl alcohol copolymer and the elastomer are blended and aluminized to obtain a modified aluminized ethylene-vinyl alcohol copolymer layer. The modified aluminized polyethylene terephthalate layer and the modified aluminized ethylene-vinyl alcohol copolymer layer are stacked together to form the modified barrier layer; and / or The mass ratio of the barrier substrate to the elastomer is 100:(1-10).

6. The membrane material for vacuum insulation panels according to claim 1, wherein, The modified heat-sealing layer, the modified barrier layer, and the modified protective layer have a thickness of 1-2000 μm, and an adhesive layer with a thickness of 1-2000 μm is provided between the modified heat-sealing layer, the modified barrier layer, and the modified protective layer.

7. The membrane material for vacuum insulation panels according to claim 6, wherein, The thickness of the modified heat-sealing layer is 20-200 μm.

8. A vacuum insulation panel, wherein, The membrane includes a getter, a composite core material, and a membrane material according to any one of claims 1-7, wherein the membrane material is in the form of a bag, and the getter and the composite core material are vacuum-encapsulated within the membrane material.

9. A method for preparing a vacuum insulation panel as described in claim 8, wherein, Includes the following steps: A membrane material is prepared by stacking a modified heat-sealing layer, a modified barrier layer, and a modified protective layer. A membrane material is used to support a membrane bag, wherein the modified heat-sealing layer serves as the inner surface of the membrane bag; The composite core material and getter are placed into the membrane bag, and after vacuuming, the composite core material and getter are vacuum sealed in the membrane bag by a hot pressing process.

10. The method for preparing a vacuum insulation panel according to claim 9, wherein, The modified heat-sealing layer is obtained by blending and extruding the elastomer with a heat-sealing substrate, granulating and blowing the film; the modified barrier layer is obtained by blending and extruding the elastomer with a barrier substrate, granulating and blowing the film with aluminum plating; and the modified protective layer is obtained by blending and extruding the elastomer with a protective substrate, granulating and blowing the film.

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