Coating type antibacterial barrier film

Abstract

The utility model relates to the field of films, in particular to a coating type antibacterial barrier film which comprises a water absorption layer, a modified layered zirconium phosphate oxygen barrier layer, a modified layered silicate water barrier layer, a base material layer and a metal nanowire antibacterial layer which are sequentially stacked. Wherein modified layered zirconium phosphate in the modified layered zirconium phosphate oxygen barrier layer is arranged in parallel; the modified layered silicate in the modified layered silicate waterproof layer is arranged in parallel; and metal nanowires in the metal nanowire antibacterial layer are mutually lapped to form a network structure. According to the utility model, the layer structure of the film is designed, so that the film has long-acting water resistance and antibacterial property, and is good in application effect.

Description

Technical Field

[0001] The utility model relates to the field of films, in particular to a coated antibacterial barrier film. Background Art

[0002] Food, medicine and other products are prone to spoilage when exposed to water vapor and oxygen, affecting product quality. The existing technology usually applies thin film materials with high water and oxygen barrier properties to the packaging of such products, thereby reducing the contact of the products with water vapor and oxygen. At present, high barrier films are mainly prepared by adding metal layers, evaporating inorganic oxide layers, and composites of multiple functional materials. Adding a metal layer can improve the barrier ability of the film, but the film prepared by this method is opaque and the contents cannot be easily identified. The method of evaporating an inorganic oxide layer is not only costly, but the inorganic layer lacks flexibility, is prone to cracks, and the barrier ability is easily lost. The barrier film obtained by composite of multiple functional materials is prone to stratification after long-term use and has poor long-term reliability.

[0003] In addition, new packaging films also need to have antibacterial properties to further extend the shelf life of the product. Utility Model Content

[0004] The utility model provides a coated antibacterial barrier film, which has long-lasting water-blocking and antibacterial properties.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A coated antibacterial barrier film comprises a water absorbing layer, a modified layered zirconium phosphate oxygen barrier layer, a modified layered silicate water barrier layer, a substrate layer, and a metal nanowire antibacterial layer which are stacked in sequence; wherein:

[0007] The modified layered zirconium phosphate in the modified layered zirconium phosphate oxygen barrier layer is arranged in parallel;

[0008] The modified layered silicates in the modified layered silicate water-blocking layer are arranged in parallel;

[0009] The metal nanowires in the metal nanowire antibacterial layer are interconnected to form a network structure.

[0010] In some embodiments, the water-absorbing layer is a cellulose ether-sodium polyacrylate mixed layer with a thickness of 1-3 μm.

[0011] In some embodiments, the modified layered zirconium phosphate oxygen barrier layer is a modified layered zirconium phosphate-PVA mixed layer with a thickness of 1-3 μm. As some embodiments of the utility model, the thickness of the modified layered zirconium phosphate oxygen barrier layer is 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, and specific point values ​​between the point values; for space considerations, the utility model no longer exhaustively lists the specific point values ​​included in the range.

[0012] In some embodiments, the modified layered silicate water-blocking layer is a modified layered silicate-UV composite coating with a thickness of 2-6 μm. As some embodiments of the present invention, the thickness of the modified layered silicate water-blocking layer is 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, and specific point values ​​between the point values; for space considerations, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0013] In some embodiments, the substrate layer includes any one of PET, BOPP, and PE layers, and has a thickness of 15-125 μm. As some embodiments of the present invention, the thickness of the substrate layer is 15 μm, 50 μm, 80 μm, 100 μm, 125 μm, and specific values ​​between the above values; for space considerations, the present invention will no longer exhaustively list the specific values ​​included in the above range.

[0014] In some embodiments, the thickness of the metal nanowire antibacterial layer is 1-6 μm. As some embodiments of the present invention, the thickness of the metal nanowire antibacterial layer is 1 μm, 2 μm, 3 μm, 5 μm, 6 μm, and specific values ​​between the above values; for space considerations, the present invention will no longer exhaustively list the specific values ​​included in the above range.

[0015] In some embodiments, the aspect ratio of the metal nanowire is 50-300. As some embodiments of the present invention, the aspect ratio of the metal nanowire is 50, 100, 150, 200, 300, and specific values ​​between the above points; for the sake of space, the present invention will no longer exhaustively list the specific points included in the above range.

[0016] In some embodiments, the metal in the metal nanowires includes one or more of gold, silver, copper, iron, tin, titanium, nickel, cobalt, and platinum.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model provides a coated antibacterial barrier film, wherein the inner layer is provided with a water-absorbing layer facing the contents to keep the contents dry; a modified layered zirconium phosphate oxygen barrier layer and a modified layered silicate water barrier layer are sequentially provided outside the water-absorbing layer, which can block water vapor and oxygen in the external air to prevent the penetration of the two and cause the contents to deteriorate; the modified layered silicate water barrier layer is provided outside the layered zirconium phosphate oxygen barrier layer to protect the oxygen barrier layer from being affected by a high humidity environment. The outer layer of the film is a metal nanowire antibacterial layer, which can release metal cations to combine with the negative charges of the thiol groups of proteins and nucleic acids in the external pathogen microorganisms, destroying their biological functions, thereby inhibiting the growth of bacteria, and making the film antibacterial.

[0019] (2) The modified layered zirconium phosphate and modified layered silicate of the oxygen barrier layer and the water barrier layer of the utility model are arranged in parallel, respectively. Combined with the two-dimensional structural characteristics of zirconium phosphate and silicate, they can form a "brick and mud" structure, thereby increasing the permeation path of small molecules, hindering the diffusion of water vapor molecules and oxygen molecules, and improving the water vapor barrier performance of the film; furthermore, the layered silicate and the layered zirconium phosphate are modified materials, respectively, which can form chemical bonds between the layers, thereby enhancing the adhesion performance between the oxygen barrier layer and the water barrier layer.

[0020] (3) The film of the utility model has a water barrier layer, an oxygen barrier layer and an antibacterial layer, and has both barrier and antibacterial capabilities; compared with adding a metal layer, it has high transparency; compared with vapor-deposited inorganic layers, it has low cost and good flexibility; compared with multi-layer composites, the film of the utility model completely uses a coating method to obtain each layer structure, and by designing the film structure and coating sequence, the adhesion between the layers is strong, it is not easy to delaminate, and it has long-lasting barrier and antibacterial properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the coated antibacterial barrier film of the utility model;

[0023] Among them: 1- modified layered silicate water barrier layer, 2- modified layered zirconium phosphate oxygen barrier layer, 3- water absorption layer, 4- substrate layer, 5- metal nanowire antibacterial layer. DETAILED DESCRIPTION

[0024] The following will be combined with specific embodiments to clearly and completely describe the technical solution 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 of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0025] like Figure 1As shown, the utility model provides a coating type antibacterial barrier film, comprising a water absorption layer 3, a modified layered zirconium phosphate oxygen barrier layer 2, a modified layered silicate water barrier layer 1, a substrate layer 4, and a metal nanowire antibacterial layer 5 which are stacked in sequence; wherein the modified layered zirconium phosphate in the modified layered zirconium phosphate oxygen barrier layer 2 is arranged in parallel; the modified layered silicate in the modified layered silicate water barrier layer 1 is arranged in parallel; and the metal nanowires in the metal nanowire antibacterial layer 5 are overlapped to form a network structure. The water absorption layer 3 faces the content side, and can not only absorb the original water vapor in the air on the content side, but also absorb the water vapor that penetrates from the external environment, further improving the water vapor barrier ability of the film and extending the life of the content. The modified layered zirconium phosphate oxygen barrier layer 2 and the modified layered silicate water barrier layer 1 are arranged on the outside of the water absorption layer 3, which can block oxygen and water vapor in the external environment and prevent water and oxygen from penetrating and causing the contents to deteriorate; at the same time, the modified layered zirconium phosphate and the modified layered silicate in the modified layered zirconium phosphate oxygen barrier layer 2 and the modified layered silicate water barrier layer 1 are respectively arranged in parallel, and combined with the two-dimensional structural characteristics of zirconium phosphate and silicate, they can form "brick and mud" structures respectively, thereby increasing the permeation path of small molecules, hindering the diffusion of water vapor molecules and oxygen molecules, and improving the water vapor barrier performance of the film; furthermore, the layered silicate is grafted and modified with an alkyl quaternary ammonium salt or a silane coupling agent, and the layered zirconium phosphate is stripped and modified and acidified with a stripping agent such as tromethamine, and the modified layered zirconium phosphate can form a chemical bond with the grafted modified layered silicate, thereby strengthening the adhesion performance between the modified layered zirconium phosphate oxygen barrier layer 2 and the modified layered silicate water barrier layer 1. By arranging the metal nanowire antibacterial layer 5 on the outer layer, the metal nanowire antibacterial layer 5 is in direct contact with the outside world, and can release metal cations to combine with the negative charges of the thiol groups of proteins and nucleic acids in the external pathogenic microorganisms, destroying their biological functions, thereby inhibiting the growth of bacteria and making the film antibacterial.

[0026] Specifically, the water-absorbing layer 3 is a cellulose ether-sodium polyacrylate mixed layer with a thickness of 1-3 μm, such as 1 μm, 2 μm, or 3 μm. The material of the water-absorbing layer 3 can be in contact with food and medicine, is non-toxic and harmless, and has good safety.

[0027] Specifically, the modified layered zirconium phosphate oxygen barrier layer 2 is a modified layered zirconium phosphate-PVA mixed layer with a thickness of 1-3μm, such as 1μm, 2μm, and 3μm; the modified layered silicate water barrier layer 1 is a modified layered silicate-UV composite coating with a thickness of 2-6μm, such as 2μm, 5μm, and 6μm. PVA has good oxygen barrier ability and can block the penetration of oxygen in the environment; compared with being directly set on the surface of the substrate layer 4, adding the modified layered silicate water barrier layer 1, when the modified layered zirconium phosphate oxygen barrier layer 2 is coated on the modified layered silicate water barrier layer 1, the coating liquid has better wettability and better coating adhesion after curing; and the PVA oxygen barrier ability decreases in a high humidity environment, and the modified layered silicate water barrier layer 1 is set outside the modified layered zirconium phosphate oxygen barrier layer 2, which can protect the modified layered zirconium phosphate oxygen barrier layer 2 from being affected by the high humidity environment.

[0028] Specifically, the substrate layer 4 includes any one of PET, BOPP, and PE layers, and has a thickness of 15-125 μm, such as 15 μm, 50 μm, or 125 μm.

[0029] Specifically, the thickness of the metal nanowire antibacterial layer 5 is 1-6 μm, for example, 1 μm, 3 μm, 6 μm; the metal in the metal nanowire includes one or more of gold, silver, copper, iron, tin, titanium, nickel, cobalt, and platinum.

[0030] Specifically, the functional layers of the coated antibacterial barrier film of the utility model, such as the water absorption layer 3, the modified layered zirconium phosphate oxygen barrier layer 2, the modified layered silicate water barrier layer 1, and the metal nanowire antibacterial layer 5, are obtained by sequentially coating the corresponding functional coating liquid on both sides of the substrate layer 4 and then curing. The film adopts the coating method so that the adhesion between the layers is strong, it is not easy to delaminate, and has long-term barrier and antibacterial properties.

[0031] Example 1

[0032] This embodiment provides a coated antibacterial barrier film, which includes, from bottom to top, a water absorbing layer 3, a modified layered zirconium phosphate oxygen barrier layer 2, a modified layered silicate water barrier layer 1, a substrate layer 4, and a metal nanowire antibacterial layer 5.

[0033] Among them, the water-absorbing layer 3 is a cellulose ether-sodium polyacrylate mixed layer with a thickness of 1 μm; the modified layered zirconium phosphate oxygen barrier layer 2 is a modified layered zirconium phosphate-PVA mixed layer with a thickness of 1 μm; the modified layered silicate water-blocking layer 1 is a modified layered silicate-UV composite coating with a thickness of 2 μm; the substrate layer 4 is a PET layer with a thickness of 15 μm; the metal nanowire antibacterial layer 5 is a silver nanowire antibacterial layer with a thickness of 1 μm, and the aspect ratio of the silver nanowire is 50-100.

[0034] The water vapor permeability of the coated antibacterial barrier film is 3×10 -3 g / (m 2·day), oxygen permeability is 6.5×10 -2 cm 3 / (m 2 ·day), the antibacterial rate is 99.99%.

[0035] Example 2

[0036] This embodiment provides a coated antibacterial barrier film, which includes, from bottom to top, a water absorbing layer 3, a modified layered zirconium phosphate oxygen barrier layer 2, a modified layered silicate water barrier layer 1, a substrate layer 4, and a metal nanowire antibacterial layer 5.

[0037] Among them, the water-absorbing layer 3 is a cellulose ether-sodium polyacrylate mixed layer with a thickness of 3 μm; the modified layered zirconium phosphate oxygen barrier layer 2 is a modified layered zirconium phosphate-PVA mixed layer with a thickness of 3 μm; the modified layered silicate water-blocking layer 1 is a modified layered silicate-UV composite coating with a thickness of 5 μm; the substrate layer 4 is a PET layer with a thickness of 50 μm; the metal nanowire antibacterial layer 5 is a silver nanowire antibacterial layer with a thickness of 5 μm, and the aspect ratio of the silver nanowire is 100-200.

[0038] The water vapor permeability of the coated antibacterial barrier film is 2.3×10 -3 g / (m 2 ·day), oxygen permeability is 2.6×10 -2 cm 3 / (m 2 ·day), the antibacterial rate is 99.99%.

[0039] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. A coated antibacterial barrier film, characterized in that: It comprises a water-absorbing layer, a modified layered zirconium phosphate oxygen-blocking layer, a modified layered silicate water-blocking layer, a substrate layer, and a metal nanowire antibacterial layer which are stacked in sequence; wherein, The modified layered zirconium phosphate in the modified layered zirconium phosphate oxygen barrier layer is arranged in parallel; The modified layered silicates in the modified layered silicate water-blocking layer are arranged in parallel; The metal nanowires in the metal nanowire antibacterial layer are interconnected to form a network structure.

2. The coated antibacterial barrier film according to claim 1, characterized in that: The water-absorbing layer is a cellulose ether-sodium polyacrylate mixed layer with a thickness of 1-3 μm.

3. The coated antibacterial barrier film according to claim 1, characterized in that: The modified layered zirconium phosphate oxygen barrier layer is a modified layered zirconium phosphate-PVA mixed layer with a thickness of 1-3 μm.

4. The coated antibacterial barrier film according to claim 1, characterized in that: The modified layered silicate water-blocking layer is a modified layered silicate-UV composite coating with a thickness of 2-6 μm.

5. The coated antibacterial barrier film according to claim 1, characterized in that: The substrate layer comprises any one of PET, BOPP and PE layers, and has a thickness of 15-125 μm.

6. The coated antibacterial barrier film according to claim 1, characterized in that: The thickness of the metal nanowire antibacterial layer is 1-6 μm.

7. The coated antibacterial barrier film according to claim 6, characterized in that: The aspect ratio of the metal nanowire is 50-300.

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