High-barrier film for vacuum insulated panel, film bag of high-barrier film and vacuum insulated panel

Abstract

The utility model relates to a high-barrier film for a vacuum insulated panel, a film bag of the high-barrier film and the vacuum insulated panel, and the high-barrier film for the vacuum insulated panel sequentially comprises a flame-retardant layer, a film bag and a film bag from one side to the other opposite side, an anti-puncture layer; a high barrier layer; and a heat sealing layer. The flame-retardant layer is an aluminum foil layer, and the high-barrier layer is an aluminum foil layer. The aluminum foil flame-retardant layer is arranged on the outermost layer of the vacuum insulated panel, so that the flame retardance of the vacuum insulated panel can be improved. Besides, the high-barrier layer is also arranged to be the aluminum foil layer, so that the high-barrier film forms a double-aluminum-foil composite structure, compared with a single-aluminum-foil structure, the double-aluminum-foil composite structure has better barrier property, the service life of the high-barrier film can be prolonged, and the service life of the vacuum insulated panel can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum insulation panels, in particular to a high-barrier film for vacuum insulation panels and a film bag thereof and a vacuum insulation panel. Background Art

[0002] In the related art, the film bags used to wrap the vacuum insulation panels are usually made of plastic film and metal film bonded by polyurethane adhesive, which we collectively call aluminum-plastic composite film. Most of this material is made of plastic material, with a relatively small proportion of metal components, so it has a certain degree of flammability, and this type of material usually has a plastic layer as the outermost layer. Due to the flammability of plastic, the vacuum insulation panels wrapped with this type of film bag are easily ignited when encountering an open flame. Utility Model Content

[0003] Based on this, it is necessary to provide a high-barrier film for vacuum insulation panels, a film bag and a vacuum insulation panel to address the problem that the film bag is flammable when exposed to open flames.

[0004] The utility model proposes a high-barrier film for a vacuum insulation panel, which comprises, from one side to the other side, a flame retardant layer, which is an aluminum foil layer; an anti-puncture layer; a high-barrier layer, which is an aluminum foil layer; and a heat-sealing layer.

[0005] As a further improvement of the present invention, the puncture-proof layer is a PA puncture-proof layer.

[0006] As a further improvement of the present invention, the heat sealing layer is a PE heat sealing layer.

[0007] As a further improvement of the present invention, two adjacent layers of the flame retardant layer, the puncture-proof layer, the high barrier layer and the heat-sealing layer are fixed together by adhesive AD.

[0008] As a further improvement of the present invention, the thickness of the flame retardant layer and the high barrier layer is 7 μm.

[0009] As a further improvement of the present invention, the thickness of the PA anti-puncture layer is 15 μm.

[0010] As a further improvement of the present invention, the thickness of the PE heat-sealing layer is 30 μm-100 μm.

[0011] As a further improvement of the present invention, the weight ratio per square meter among the flame retardant layer, the puncture-proof layer, the high barrier layer and the heat-sealing layer is: 18.9 g / m2: 17.25 g / m2: 18.9 g / m2: 46.0 g / m2.

[0012] The utility model also proposes a film bag applied to a vacuum insulation panel, wherein the film material of the film bag is the high-barrier film for the vacuum insulation panel as mentioned above.

[0013] The utility model also provides a vacuum insulation panel, comprising: the above-mentioned film bag applied to the vacuum insulation panel.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model provides an aluminum foil flame retardant layer on the outermost layer of the vacuum insulation panel, which can improve the flame retardancy of the vacuum insulation panel.

[0016] 2. The utility model sets the high barrier layer as an aluminum foil layer, so that the high barrier film forms a double aluminum foil composite structure. Compared with the single aluminum foil structure, it has better barrier properties and can extend the service life of the high barrier film, thereby extending the service life of the vacuum insulation panel.

[0017] 3. Using PA material for the puncture-proof layer can make the high-barrier film have good puncture resistance and tensile resistance, which can better protect the vacuum insulation panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial structural cross-sectional view of a high-barrier film for a vacuum insulation panel according to an embodiment of the utility model.

[0019] Main component symbols

[0020] 1. Flame retardant layer; 2. Anti-puncture layer; 3. High barrier layer; 4. Heat seal layer.

[0021] The above main component symbols are combined with the accompanying drawings and specific implementation methods to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0024] like Figure 1 As shown, the embodiment of the utility model proposes a high barrier film for vacuum insulation panels. The high barrier film for vacuum insulation panels of the utility model is mainly used for vacuum insulation panels. For example, electronic products such as electric ovens and refrigerators have higher heat resistance requirements than the films on ordinary food packaging bags. When used, the high barrier film can be made into a film bag first, and then the vacuum insulation panel can be packaged with the film bag. Of course, the high barrier film can also be used to directly package the vacuum insulation panel, i.e., the VIP panel.

[0025] Specifically, the high barrier film for vacuum insulation panels includes, from one side to the other side, a flame retardant layer 1, a puncture-proof layer 2, a high barrier layer 3, and a heat-sealing layer 4. It should be noted that in the film bag and vacuum insulation panel made of the high barrier film, from the outside to the inside, they include: a flame retardant layer 1, a puncture-proof layer 2, a high barrier layer 3, and a heat-sealing layer 4.

[0026] The material of the flame retardant layer 1 can be an aluminum foil layer. Since aluminum foil is a metal material, using aluminum foil as the outermost structure of the vacuum insulation panel can improve the flame retardancy of the vacuum insulation panel, thereby improving the fire resistance of the vacuum insulation panel. The thickness of the flame retardant layer 1 can be 7 μm.

[0027] It should be noted that barrier layers have medium and high grades, and the medium and high grades have relatively unified standards in the industry. For example, high barrier means that the water vapor permeability per square meter of film within 24 hours is less than 1 mg, or the oxygen permeability per square meter of film within 24 hours is less than 1 ml. Medium barrier means that the water vapor permeability per square meter of film within 24 hours is less than 10 mg, or the oxygen permeability per square meter of film within 24 hours is less than 10 ml.

[0028] Therefore, the high barrier layer 3 is an aluminum foil layer, which is mainly used to block the penetration of water vapor and oxygen. Aluminum foil is a dense metal layer with better barrier properties than aluminum-plated film and vapor-deposited film. The thickness of the high barrier layer 3 can be 7 μm.

[0029] From the above, it can be seen that the high barrier film for vacuum insulation panels adopts a double aluminum foil composite structure, so that the high barrier film for vacuum insulation panels has better barrier properties than the single-layer aluminum foil structure, and also has better flame retardancy, which can extend the service life of the high barrier film for vacuum insulation panels, thereby extending the service life of the vacuum insulation panels.

[0030] In addition, the puncture-proof layer 2 mainly plays a role in preventing collisions, and can protect the structure of the high-barrier film for the vacuum insulation panel. The puncture-proof layer 2 can be made of PA puncture-proof layer 2. The PA material is generally PA plastic (nylon, polyamide). The nylon material has good toughness, puncture resistance and tensile resistance, and can better protect the high-barrier film for the vacuum insulation panel, thereby better protecting the vacuum insulation panel. Of course, the puncture-proof layer 2 can also be made of other suitable materials. The thickness of the PA puncture-proof layer 2 can be 15 μm.

[0031] In addition, the heat sealing layer 4 is mainly used for heat sealing packaging. The heat sealing layer 4 can be made of PE material, which is polyethylene material. Polyethylene material is a thermoplastic plastic with a certain degree of crystallinity and strong intermolecular force, so it has good heat sealing performance, so that it is easier to seal when the vacuum insulation panel is evacuated. Of course, the heat sealing layer 4 can also be made of other suitable materials.

[0032] Furthermore, the thickness of the PE heat sealing layer 4 is 30 μm-100 μm. In other words, the thickness of the PE heat sealing layer 4 needs to meet a certain range, that is, the thickness of the PE heat sealing layer 4 needs to be greater than or equal to 30 μm, so that the PE heat sealing layer 4 can meet the thickness requirements of heat sealing and have better sealing performance. In addition, the thickness of the PE heat sealing layer 4 also needs to be less than or equal to 100 μm, so that the thickness of the PE heat sealing layer 4 can be reduced, thereby reducing the thickness of the vacuum insulation panel.

[0033] In addition, the flame retardant layer 1, the puncture-proof layer 2, the high barrier layer 3 and the heat-sealing layer 4 are fixed together by adhesive AD. Specifically, the adhesive AD is a two-component polyurethane, and the high barrier film for vacuum insulation panels bonded with the two-component polyurethane has certain weather resistance and temperature resistance, so that the vacuum insulation panel made of the high barrier film for vacuum insulation panels can be used in more areas and has better applicability.

[0034] In addition, the weight ratio per square meter among the flame retardant layer 1, the puncture-proof layer 2, the high barrier layer 3 and the heat-sealing layer 4 is: 18.9 g / m2: 17.25 g / m2: 18.9 g / m2: 46.0 g / m2.

[0035] Furthermore, since the flame retardant layer 1, the puncture-proof layer 2, the high barrier layer 3 and the heat-sealing layer 4 are fixed together on adjacent sides by adhesive AD, the gram weight ratio per square meter of the flame retardant layer 1, adhesive AD, the puncture-proof layer 2, adhesive AD, the high barrier layer 3, adhesive AD and the heat-sealing layer 4 is: 18.9 g / m2: 3.8 g / m2: 17.25 g / m2: 3.8 g / m2: 18.9 g / m2: 3.8 g / m2: 46.0 g / m2.

[0036] The embodiment of the utility model further proposes a film bag applied to a vacuum insulation panel, wherein the film material of the film bag is the high-barrier film for the vacuum insulation panel.

[0037] The embodiment of the utility model further proposes a vacuum insulation panel, comprising: the film bag applied to the vacuum insulation panel. The vacuum insulation panel also includes a core material, and the vacuum insulation panel can be made by putting the core material into the film bag and performing hot pressing packaging.

[0038] The production process steps of high barrier film for vacuum insulation panels are as follows, using a dry composite coating process.

[0039] Step 1: Roll-coat the aluminum foil film with glue, and heat-press and laminate it with the PA puncture-proof layer 2 film to form an AL / PA two-layer composite film;

[0040] Step 2: Roll-coat the PA puncture-proof layer 2 of the AL / PA two-layer composite film with glue, and hot-press and laminate it with another layer of aluminum foil film to form an AL / PA / AL three-layer composite film;

[0041] Step 3: Roll-coat and glue another layer of aluminum foil film of the AL / PA / AL three-layer composite film, and heat-press and laminate it with the PE heat-sealing layer 4 film to form an AL / PA / AL / PE four-layer composite film.

[0042] The thickness and weight of each layer of film are:

[0043]

[0044] Appearance: Usually in the form of a film or bag, the high barrier film for vacuum insulation panels has an off-white outer surface and a silver inner layer.

[0045] Performance Testing

[0046] 1. Flame retardant performance test:

[0047] The vacuum insulation panels made of ordinary aluminum-plastic film materials and the vacuum insulation panels made of high-barrier film materials in this application were tested for combustion performance according to GB8624-2012, and the test recorded the combustion value, combustion growth rate and combustion performance grade determination.

[0048]

[0049] 2. Simulation calculation of oxygen permeability under different temperature conditions:

[0050] The calculation is based on the increase in thermal conductivity of the vacuum insulation panels after aging.

[0051] Membrane Type -60℃ -40℃ -20℃ 0℃ 20℃ 40℃ 60℃ 80℃ Conventional membrane materials 0.008 0.011 0.015 0.021 0.045 0.072 0.16 0.31 High barrier film 0.002 0.004 0.004 0.004 0.005 0.005 0.008 0.015

[0052] Conclusion: Under room temperature conditions, high-barrier film materials have better barrier properties than conventional film materials; with the change of temperature, the barrier properties of conventional film materials change more obviously, and the oxygen barrier properties of high-barrier film materials change relatively little. Comprehensively judging, the barrier properties of high-barrier films are significantly better than those of conventional film materials.

[0053] 3. Comparison of aging resistance test data of vacuum insulation panels.

[0054] Test conditions:

[0055] 1. Conventional film materials and high barrier film materials are made into three-side sealed film bags of the same size, and glass fiber is used as the core material to make a 300mm*300mm*10mm vacuum insulation panel.

[0056] 2. Place the vacuum insulation panel at room temperature for 7 days and test the initial thermal conductivity λ 0 ;

[0057] 3. According to the life test conditions of GB37608 national standard, the vacuum insulation panel is placed in a test box at 70℃ and 90%RH for aging. After 7 days, it is taken out and the thermal conductivity is tested and recorded as λ 1 After the test, the test thermal conductivity is recorded as λ after aging in the test box for 7 days (accumulative aging for 14 days). 2 After the test, the tester was placed in the test box for aging for 7 days (accumulative aging for 21 days) and the thermal conductivity was recorded as λ 3 After the test, the test thermal conductivity is recorded as λ after aging in the test box for 7 days (accumulative aging for 28 days). 4 .

[0058] 4. The thermal conductivity coefficient obtained after aging for 28 days minus the initial thermal conductivity coefficient λ 0 The increase in thermal conductivity Δλ is obtained, and the quality of the barrier properties of the film material can be determined by comparing the size of Δλ.

[0059]

[0060] Conclusion: When conducting a life aging test according to GB-37608 (2019) standard, the increase in thermal conductivity of vacuum insulation panels made of conventional membrane materials after 28 days of life aging test is significantly higher than the increase in thermal conductivity of vacuum insulation panels made of high-barrier films. Therefore, it can be judged that vacuum insulation panels made of high-barrier films have better heat resistance.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high barrier film for a vacuum insulation panel, characterized in that: The high barrier film for the vacuum insulation panel comprises, from one side to the other side, the following: A flame retardant layer (1), wherein the flame retardant layer (1) is an aluminum foil layer; a puncture-resistant layer (2); A high barrier layer (3), wherein the high barrier layer (3) is an aluminum foil layer; and Heat sealing layer (4).

2. A high barrier film for a vacuum insulation panel according to claim 1, characterized in that: The puncture-proof layer (2) is a PA puncture-proof layer (2).

3. The high barrier film for vacuum insulation panels according to claim 1, characterized in that: The heat sealing layer (4) is a PE heat sealing layer (4).

4. The high barrier film for vacuum insulation panels according to claim 1, characterized in that: Adjacent two layers of the flame retardant layer (1), the puncture-resistant layer (2), the high barrier layer (3) and the heat-sealing layer (4) are fixed together by adhesive AD.

5. The high barrier film for vacuum insulation panels according to claim 1, characterized in that: The thickness of the flame retardant layer (1) and the high barrier layer (3) is 7 μm.

6. A high barrier film for a vacuum insulation panel according to claim 2, characterized in that: The thickness of the PA anti-puncture layer (2) is 15 μm.

7. The high barrier film for vacuum insulation panels according to claim 3, characterized in that: The thickness of the PE heat-sealing layer (4) is 30 μm-100 μm.

8. The high barrier film for vacuum insulation panels according to claim 1, characterized in that: The weight ratio per square meter of the flame retardant layer (1), the puncture-proof layer (2), the high barrier layer (3) and the heat-sealing layer (4) is: 18.9 g / m2: 17.25 g / m2: 18.9 g / m2: 46.0 g / m2.

9. A film bag used for a vacuum insulation panel, characterized in that: The film material of the film bag is the high-barrier film for the vacuum insulation panel according to any one of claims 1 to 8.

10. A vacuum insulation panel, characterized in that: include: The film bag used for the vacuum insulation panel according to claim 9.

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