Water vapor barrier film

Abstract

The utility model discloses a water vapor barrier film. The water vapor barrier film comprises a base material layer, a flat layer, a barrier layer and a metal oxide sealing cover layer, the flat layer is coated on the surface of the base material layer; the barrier layer is plated on the surface of the flat layer; the metal protective layer is plated on the surface of the barrier layer; and the metal oxide capping layer is plated on the surface of the metal protection layer. According to the water vapor barrier film disclosed by the utility model, the weather resistance of the water vapor barrier film in an outdoor severe environment for a long time can be improved by arranging the metal protection layer and the metal oxide sealing cover layer, so that the efficient and stable water vapor barrier performance can be maintained. In addition, the flat layer can also provide a certain water vapor barrier effect, so that the overall performance of the water vapor barrier film is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of film materials, in particular to a water vapor barrier film. Background Art

[0002] As an important functional material, moisture vapor barrier film plays an irreplaceable role in multiple fields. With technological advancements and shifting market demands, the application scope of moisture vapor barrier film continues to expand, and its importance is becoming increasingly prominent. A moisture vapor barrier film is formed by depositing inorganic oxides onto a substrate through processes such as magnetron sputtering and vapor deposition. This film effectively blocks the corrosion of electronic component materials by water and oxygen, maintaining the product's lifespan and performance. Moisture vapor barrier film is primarily used in flexible OLED screens, flexible photovoltaic cells, and flexible OLED lighting. By forming a barrier film on the surface of a flexible substrate, it isolates the product's internal components from external moisture, achieving a barrier effect.

[0003] Chinese patents CN106903954A and CN116284938A disclose a water vapor barrier film that uses Al2O3, SiO2, and Si3N4 as a barrier layer, deposited on a polymer substrate using atomic layer deposition or physical vapor deposition. In applications, particularly in the photovoltaic field, such films experience a significant decrease in water barrier properties after prolonged use due to the effects of outdoor environments, potentially affecting the product's performance.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0005] The purpose of the utility model is to provide a water vapor barrier film, which can improve the weather resistance in harsh outdoor environments for a long time, thereby maintaining efficient and stable water vapor barrier performance.

[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: a water vapor barrier film comprising: a substrate layer, a planar layer, a barrier layer, and a metal oxide capping layer. The planar layer is coated on the surface of the substrate layer; the barrier layer is plated on the surface of the planar layer; the metal protective layer is plated on the surface of the barrier layer; and the metal oxide capping layer is plated on the surface of the metal protective layer.

[0007] In one or more embodiments of the present invention, the metal protective layer is selected from one of a Ni layer, a Cr layer and a NiCr layer.

[0008] In one or more embodiments of the present application, the metal protective layer has a thickness of 0.5nm-3nm.

[0009] In one or more embodiments of the present application, the metal oxide capping layer is selected from a Nb2O5 layer.

[0010] In one or more embodiments of the present application, the metal oxide capping layer has a thickness of 3nm-10nm.

[0011] In one or more embodiments of the present application, the barrier layer is selected from one of a SiO2 layer, a SiO layer, a Si3N4 layer, an Al2O3 layer, a TiN layer and a TiO2 layer.

[0012] In one or more embodiments of the present application, the barrier layer has a thickness of 50nm-200nm.

[0013] In one or more embodiments of the present application, the planar layer has a thickness of 1μm-5μm.

[0014] In one or more embodiments of the present application, the substrate layer is selected from one of a polyester layer, a polypropylene layer, a polyethylene layer, a polyimide layer and a polycarbonate layer.

[0015] In one or more embodiments of the present application, the substrate layer has a thickness of 50μm-250μm.

[0016] Compared with the prior art, the water vapor barrier film of the present application can improve the weather resistance of the water vapor barrier film in outdoor harsh environment for a long time through the arrangement of the metal protective layer and the metal oxide capping layer, so as to maintain the efficient and stable water vapor barrier performance. In addition, the planar layer can also provide a certain water vapor barrier effect, so that the overall performance of the water vapor barrier film is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is a schematic view of the water vapor barrier film in one embodiment of the present application.

[0019] Explanation of main reference signs:

[0020] 1 - substrate layer, 2 - flat layer, 3 - barrier layer, 4 - metal protective layer, 5 - metal oxide capping layer. DETAILED DESCRIPTION

[0021] In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0022] As shown in the drawings, the water vapor barrier film in an embodiment of the present application includes a substrate layer 1, a flat layer 2, a barrier layer 3, a metal protective layer 4 and a metal oxide capping layer 5. The flat layer 2 is coated on the surface of the substrate layer 1; the barrier layer 3 is plated on the surface of the flat layer 2. The metal protective layer 4 is plated on the surface of the barrier layer 3. The metal oxide capping layer 5 is plated on the surface of the metal protective layer 4. Figure 1 In the above embodiment, the water vapor barrier film can realize the weather resistance of the water vapor barrier film for a long time in outdoor harsh environment by setting the metal protective layer 4 and the metal oxide capping layer 5, so as to maintain the efficient and stable water vapor barrier performance.

[0023] In an embodiment, the substrate layer 1 is selected from one of a polyester layer (PET), a polypropylene layer (PP), a polyethylene layer (PE), a polyimide layer (PI) and a polycarbonate layer (PC). Further, the thickness of the substrate layer 1 is between 50 μm and 250 μm.

[0024] The surface of the substrate layer 1 is coated with the flat layer 2 for improving the adhesion between the substrate layer 1 and the barrier layer 3. In addition, the flat layer 2 can also improve the water vapor barrier effect of the water vapor barrier film to a certain extent. The thickness of the flat layer 2 is between 1 μm and 5 μm. Preferably, the flat layer 2 can be coated on the surface of the substrate layer 1 by using an acrylic resin. For example, the acrylic resin can use the hardened resin of the model LCH2291NL of the Oriental Ink.

[0025] The surface of the flat layer 2 is plated with the barrier layer 3. The barrier layer 3 is usually made of metal oxide, for example, the barrier layer 3 can be selected from one of a SiO2 layer, a SiO layer, a Si3N4 layer, an Al2O3 layer, a TiN layer and a TiO2 layer. Further, the thickness of the barrier layer 3 is between 50 nm and 200 nm. The barrier layer 3 can provide the main water vapor barrier performance in the water vapor barrier film, so as to make the film have the efficient water vapor barrier effect.

[0026] The surface of the flat layer 2 is plated with the barrier layer 3. The barrier layer 3 is usually made of metal oxide, for example, the barrier layer 3 can be selected from one of a SiO2 layer, a SiO layer, a Si3N4 layer, an Al2O3 layer, a TiN layer and a TiO2 layer. Further, the thickness of the barrier layer 3 is between 50 nm and 200 nm. The barrier layer 3 can provide the main water vapor barrier performance in the water vapor barrier film, so as to make the film have the efficient water vapor barrier effect.

[0027] The surface of the barrier layer 3 is plated with a metal protective layer 4 for preventing the barrier layer 3 from being corroded and damaged in outdoor application scenarios. The metal protective layer 4 can be selected from one of a Ni layer, a Cr layer and a NiCr layer. Since the metal or metal alloy adopted by the metal protective layer 4 has a relatively high light absorption, the thickness of the metal protective layer 4 needs to be controlled to balance the visible light transmittance and weather resistance of the overall film layer. Preferably, the thickness of the metal protective layer 4 is between 0.5 nm and 3 nm.

[0028] A metal oxide capping layer 5 is arranged on the surface of the metal protective layer 4. The metal oxide capping layer 5 can be a Nb2O5 layer. Further, the thickness of the metal oxide capping layer 5 is between 3 nm and 10 nm. The metal oxide capping layer 5 can be used to prevent the metal protective layer 4 from being oxidized, further improving the weather resistance of the water vapor barrier film.

[0029] The utility model will be further described below in combination with specific examples and comparative examples.

[0030] Example 1

[0031] The water vapor barrier film comprises a substrate layer 1, a flat layer 2, a barrier layer 3, a metal protective layer 4 and a metal oxide capping layer 5.

[0032] The substrate layer 1 is a PET layer. The flat layer 2 is an acrylic resin layer with a thickness of 2 μm. The barrier layer 3 is SiO2 with a thickness of 150 nm. The metal protective layer 4 is a Ni layer with a thickness of 1 nm. The metal oxide capping layer 5 is a Nb2O5 layer with a thickness of 5 nm.

[0033] Example 2

[0034] The water vapor barrier film comprises a substrate layer 1, a flat layer 2, a barrier layer 3, a metal protective layer 4 and a metal oxide capping layer 5.

[0035] The substrate layer 1 is a PET layer. The flat layer 2 is an acrylic resin layer with a thickness of 2 μm. The barrier layer 3 is SiO2 with a thickness of 150 nm. The metal protective layer 4 is a Ni layer with a thickness of 0.5 nm. The metal oxide capping layer 5 is a Nb2O5 layer with a thickness of 5 nm.

[0036] Example 3

[0037] The water vapor barrier film comprises a substrate layer 1, a flat layer 2, a barrier layer 3, a metal protective layer 4 and a metal oxide capping layer 5.

[0038] The substrate layer 1 is a PET layer. The flat layer 2 is an acrylic resin layer with a thickness of 2 μm. The barrier layer 3 is SiO2 with a thickness of 150 nm. The metal protective layer 4 is a Ni layer with a thickness of 3 nm. The metal oxide capping layer 5 is a Nb2O5 layer with a thickness of 10 nm.

[0039] Comparative Example 1

[0040] The water vapor barrier film includes a substrate layer, a flat layer, a barrier layer and a metal protective layer.

[0041] The substrate layer is a PET layer. The flattening layer is an acrylic resin layer with a thickness of 2μm. The barrier layer is SiO2 with a thickness of 150nm. The metal protection layer is a Ni layer with a thickness of 1nm.

[0042] Comparative Example 2

[0043] The water vapor barrier film includes a substrate layer, a planar layer, a barrier layer and a metal oxide capping layer.

[0044] The substrate layer is a PET layer. The flattening layer is an acrylic resin layer with a thickness of 2μm. The barrier layer is SiO2 with a thickness of 150nm. The metal oxide capping layer is a Nb2O5 layer with a thickness of 5nm.

[0045] Comparative Example 3

[0046] The water vapor barrier film includes a substrate layer, a flat layer and a barrier layer.

[0047] The substrate layer is a PET layer. The flat layer is an acrylic resin layer with a thickness of 2μm. The barrier layer is SiO2 with a thickness of 150nm.

[0048] Examples 1-3 and comparative examples 1-3 were subjected to a neutral salt spray weathering test and a high temperature and high humidity weathering test, and the water vapor transmission rates after the tests are shown in Tables 1 and 2 below.

[0049] Table 1. Water vapor transmission rate after neutral salt spray test

[0050]

[0051] Table 2. Water vapor transmission rate after weather resistance high temperature and high humidity test (double 85 temperature 85℃, humidity 85%)

[0052]

[0053] As can be seen from Table 1 and Table 2 above, Comparative Example 1 is only provided with a metal protective layer compared to Example 1. The water vapor barrier film of Comparative Example 1 has a low visible light transmittance. In the weather resistance test, after the salt spray test and the high temperature and high humidity test, the water vapor barrier performance of the water vapor barrier film of Comparative Example 1 is reduced to a certain extent. -4 g / m 2 ·Day reduced to 10 -3 g / m 2 day, down an order of magnitude.

[0054] Comparative Example 2 Compared with Example 1, although the water vapor barrier film with only a metal oxide capping layer has a higher visible light transmittance, its water vapor barrier performance is significantly reduced after the salt spray test and the high temperature and high humidity test in the weather resistance test. -4 g / m 2 ·Day reduced to about 10 -3 g / m 2 day, down an order of magnitude.

[0055] Compared with Example 1 and Comparative Example 3, the metal protective layer 4 and the metal oxide capping layer 5 are superimposed, which can balance the permeability and weather resistance of the water vapor barrier film, so that its water barrier performance can still be maintained at 10 after being subjected to salt spray ring test for 200 hours or high temperature and high humidity double 85 ring test for 1000 hours. -4 g / m 2 Compared with the comparative example 3 without adding the metal protective layer and the metal oxide capping layer, the water vapor barrier film of the comparative example 3 has an initial water barrier performance of about 10 -4 g / m 2 ·day, but after 200h of salt spray test or 1000h of high temperature and high humidity double 85 ring test, its water barrier performance dropped significantly, about 10 -2 g / m 2 ·day, reduced by two orders of magnitude.

[0056] In summary, the provision of the metal protective layer 4 and the metal oxide capping layer 5 in the water vapor barrier film of the present invention improves the weather resistance of the water vapor barrier film in harsh outdoor environments for extended periods, thereby maintaining efficient and stable water vapor barrier performance. Furthermore, the flat layer 2 also provides a certain water vapor barrier effect, thereby enhancing the overall performance of the water vapor barrier film.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0058] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A water vapor barrier film, characterized in that: include: substrate layer; a flat layer, coated on the surface of the substrate layer; a barrier layer, plated on the surface of the flat layer; A metal protective layer, plated on the surface of the barrier layer; and The metal oxide capping layer is plated on the surface of the metal protective layer.

2. The water vapor barrier film according to claim 1, characterized in that The metal protective layer is selected from one of a Ni layer, a Cr layer and a NiCr layer.

3. The water vapor barrier film according to claim 1, characterized in that The thickness of the metal protection layer is between 0.5 nm and 3 nm.

4. The water vapor barrier film according to claim 1, characterized in that The metal oxide capping layer is selected from Nb2O5 layer.

5. The water vapor barrier film according to claim 1, characterized in that The thickness of the metal oxide capping layer is between 3 nm and 10 nm.

6. The water vapor barrier film according to claim 1, characterized in that The barrier layer is selected from one of a SiO2 layer, a SiO layer, a Si3N4 layer, an Al2O3 layer, a TiN layer and a TiO2 layer.

7. The water vapor barrier film according to claim 1, characterized in that The thickness of the barrier layer is between 50 nm and 200 nm.

8. The water vapor barrier film according to claim 1, characterized in that The thickness of the planar layer is between 1 μm and 5 μm.

9. The water vapor barrier film according to claim 1, characterized in that The substrate layer is selected from one of a polyester layer, a polypropylene layer, a polyethylene layer, a polyimide layer and a polycarbonate layer.

10. The water vapor barrier film according to claim 1, characterized in that The thickness of the substrate layer is between 50 μm and 250 μm.

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