PET (Polyethylene Terephthalate) barrier film material and preparation method thereof

Abstract

The invention discloses a barrier film material which comprises a base film layer, a bottom coating layer and a barrier layer, and two opposite surfaces are formed on the base film layer in the thickness direction; the bottom coating is located on one side of the base film layer and attached to the surface of the base film layer; the blocking layer is located on the side, away from the base film layer, of the bottom coating layer and attached to the bottom coating layer, the blocking layer comprises a polymer matrix and nano-filler, and the nano-filler comprises at least two of zero-dimensional nano-filler, one-dimensional nano-filler, two-dimensional nano-filler or three-dimensional nano-filler and must comprise the two-dimensional nano-filler. The invention further discloses a preparation method of the barrier film material. According to the barrier membrane material, the barrier layer filled with the multiple different-dimension fillers including the two-dimensional nano filler is arranged in the barrier membrane material, the multiple different-dimension fillers cooperate with one another, a labyrinth type three-dimensional barrier network is constructed in the barrier membrane material, and the water and oxygen barrier property of the barrier membrane material is improved.

Description

Technical Field

[0001] This application relates to the field of membrane materials technology, and in particular to a PET barrier film and its preparation method. Background Technology

[0002] PET itself has many advantages, such as transparency, strength, recyclability, and low cost. However, its water vapor barrier and oxygen barrier properties are only at a moderate level, which cannot meet the needs of industries such as high-end food packaging, flexible electronics, pharmaceutical encapsulation, and OLED displays. Therefore, how to improve the water and oxygen barrier performance of PET film materials is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application provides a barrier membrane material with good water vapor and oxygen blocking effect.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: One aspect of this application provides a barrier film material, which includes a base film layer, a base coating layer, and a barrier layer. The base film layer has two opposing surfaces in the thickness direction. The base coating layer is located on one side of the base film layer and is attached to the surface of the base film layer. The barrier layer is located on the side of the base coating layer away from the base film layer and is attached to the base coating layer. The barrier layer includes a polymer matrix and nanofillers. The nanofillers include at least two of zero-dimensional nanofillers, one-dimensional nanofillers, two-dimensional nanofillers, or three-dimensional nanofillers, and must include two-dimensional nanofillers.

[0005] Furthermore, the size range of the zero-dimensional nanofillers is 30 nm to 50 nm, the size range of the one-dimensional nanofillers is 50 nm to 60 nm, the size range of the two-dimensional nanofillers is 60 nm to 80 nm, and the specific surface area of ​​the two-dimensional nanofillers ranges from 500 m². 2 / g to 1500m 2 / g, the size range of the three-dimensional nanofiller is 80nm to 100nm, and the specific surface area of ​​the three-dimensional material ranges from 500m². 2 / g to 1500m 2 / g; In nanofillers, the size of high-dimensional nanofillers is larger than that of low-dimensional nanofillers.

[0006] Furthermore, when the nanofiller includes two-dimensional nanofillers, the weight percentage of the two-dimensional nanofiller in the total weight of the nanofiller ranges from 50% to 60%.

[0007] Furthermore, when the nanofiller includes three dimensions of nanofiller, the weight percentage of the two-dimensional nanofiller in the total weight of the nanofiller ranges from 30% to 50%.

[0008] Furthermore, when the nanofiller includes four dimensions of nanofiller, the weight of the two-dimensional nanofiller accounts for 20% to 30% of the total weight of the nanofiller.

[0009] Furthermore, the zero-dimensional nanofiller includes at least one of carbon quantum dots, graphene quantum dots, gold nanoparticles, silver nanoparticles, silica nanoparticles, titanium dioxide nanoparticles, or zinc oxide nanoparticles.

[0010] Furthermore, the one-dimensional nanofiller includes at least one of carbon nanotubes, silver nanowires, gold nanorods, or nanofibers.

[0011] Furthermore, the two-dimensional nanofiller includes at least one of graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, black scale, or layered double hydroxides.

[0012] Furthermore, the three-dimensional nanofiller includes at least one of aerogel or molecular sieve.

[0013] Furthermore, the base film layer forms a micron-scale textured structure on at least the surface near the undercoat layer.

[0014] Furthermore, the depth of the recessed portion in the embossed pattern structure ranges from 5 μm to 10 μm, and the height of the raised portion in the embossed pattern structure ranges from 5 μm to 10 μm.

[0015] Furthermore, the thickness of the base film layer ranges from 200 μm to 300 μm, the thickness of the undercoat layer ranges from 500 nm to 1000 nm, and the thickness of the barrier layer ranges from 300 nm to 1000 nm.

[0016] Furthermore, the raw materials for preparing the primer coating include 10 to 15 parts by weight of a base resin, 3 to 5 parts by weight of a curing agent, and 0.1 to 1 part by weight of an additive.

[0017] Furthermore, the additives include 0.1 to 0.15 parts by weight of a leveling agent, 0.15 to 0.2 parts by weight of a pH adjuster, and 0.5 to 0.65 parts by weight of a primer additive.

[0018] Furthermore, the raw materials for preparing the barrier layer include 20 to 30 parts by weight of polymer matrix, 4 to 8 parts by weight of nanofiller and 1 to 2 parts by weight of barrier layer additive.

[0019] Furthermore, the matrix resin includes one of the following: an aqueous polyurethane dispersion, an aqueous acrylic dispersion, a polyurethane-acrylic hybrid dispersion, or an acrylic-modified polyurethane.

[0020] Furthermore, the curing agent includes at least one of the following: hydrophilically modified aliphatic waterborne polyisocyanates, aziridine crosslinking agents, carbodiimide crosslinking agents, or oxazoline crosslinking agents.

[0021] Furthermore, the leveling agent includes at least one of silicone leveling agents, acrylic leveling agents, or fluorocarbon surfactants.

[0022] Furthermore, the pH adjuster includes at least one of inorganic base adjusters or organic amine adjusters.

[0023] Furthermore, the primer coating additive includes one of silica sol or core-shell structured polystyrene.

[0024] Furthermore, the polymer matrix includes one of aqueous polyurethane, polyvinyl alcohol, polyimide, or acrylic emulsion.

[0025] Furthermore, the barrier layer additives include silane coupling agents.

[0026] Another aspect of this application provides a method for preparing a barrier film material, which includes the following steps: Preparation of the base coating slurry: The raw materials for preparing the base coating are mixed with a diluent and stirred evenly to obtain the base coating slurry; Barrier layer slurry preparation: The raw materials for preparing the base layer are mixed with a diluent and stirred evenly to obtain the base layer slurry; In the preparation of the membrane material, a base coating slurry is coated on the base membrane layer to form a base coating layer, and a barrier layer slurry is coated on the side of the base coating layer away from the base membrane layer to form a barrier layer.

[0027] Furthermore, in the preparation process of the barrier layer raw material, the order of adding nanofillers is as follows: first add high-dimensional nanofillers and then add low-dimensional nanofillers. After one high-dimensional nanofiller is mixed evenly with other components, the next low-dimensional nanofiller is added and mixed evenly.

[0028] In this application, a barrier layer filled with fillers of various dimensions, including two-dimensional nanofillers, is set in the barrier membrane material. Through the synergistic cooperation of the fillers of various dimensions, a "maze-like" three-dimensional barrier network is constructed in the barrier membrane material, thereby improving the water and oxygen barrier properties of the barrier membrane material. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the specific embodiments of the present application will be clearly and completely described below.

[0030] One aspect of this application provides a barrier membrane material that exhibits high barrier properties against water vapor and oxygen. The barrier membrane material is essentially formed by laminating a base film layer, a primer layer, and a barrier layer. The base film layer has two opposing surfaces along its thickness direction. The primer layer is located on one side of the base film layer and adhered to that side surface. The barrier layer is located on the side of the primer layer away from the base film layer and adhered to that side surface. The base film layer, as the main structure of the barrier membrane material, primarily serves as a carrier supporting the primer layer and the barrier layer, among other layers. The primer layer is located between the base film layer and the barrier layer, serving to connect the barrier layer to the base film layer and enhance the bonding strength between the barrier layer and the base film layer. The barrier layer includes a polymer matrix and nanofillers. The polymer matrix constitutes the main part of the barrier layer, and the nanofillers are dispersed within the polymer matrix. Nanofillers can increase the strength of the barrier layer by forming a reinforcing phase within the polymer matrix. Furthermore, their distribution within the polymer matrix allows them to construct a "maze-like" three-dimensional barrier network structure within the barrier layer, enhancing its barrier effect against water vapor and oxygen. On one hand, nanofillers form a barrier layer within the barrier layer, preventing water and oxygen from passing through. On the other hand, the "maze-like" three-dimensional barrier network structure they form significantly extends the path length of water and oxygen through the barrier layer, increasing the difficulty for them to pass through and thus improving the barrier effect. The nanofillers in the barrier layer are selected from at least two of zero-dimensional, one-dimensional, two-dimensional, or three-dimensional nanofillers, and must include two-dimensional nanofillers. Two-dimensional nanofillers are layered and sheet-like. When added to the barrier layer, they form a barrier structure that extends along the direction of the barrier layer, effectively blocking water and oxygen. The nanofillers also include at least one type of filler other than two-dimensional nanofillers. These fillers, when added to the barrier layer, can either fill the gaps between the two-dimensional nanofillers (one-dimensional and zero-dimensional nanofillers) or block these gaps (three-dimensional nanofillers). These fillers work synergistically with the two-dimensional nanofillers to form a "maze-like" three-dimensional barrier structure within the barrier layer. This three-dimensional barrier structure prevents components such as water and oxygen from passing through the barrier structure composed of two-dimensional nanofillers or through the gaps between them, thereby improving the water and oxygen barrier effect of the barrier layer. The more types of nanofillers added to the barrier layer, the more complex the resulting three-dimensional barrier structure becomes, which can better extend the path length of water and oxygen through the barrier layer, increase the difficulty for components such as water and oxygen to pass through the barrier layer, and improve the barrier layer's barrier effect against water and oxygen.It should be understood that, except for special cases such as interactions between nanofillers or between nanofillers and other components, the nanofillers in this application function solely due to their structure and morphology. Nanofillers with the same structure and morphology (such as dimensional requirements for length, width, height, thickness, or specific surface area) provide essentially the same technical effect in the embodiments of this application, and will not fundamentally change the function of the nanofillers in the embodiments of this application. For example, if the two-dimensional material is graphene or molybdenum disulfide, as long as the dimensional requirements for length, width, and thickness are consistent and neither reacts with other nanofillers or other components, then the technical effect of these two fillers in the embodiments of this application will be essentially the same.

[0031] As an optional implementation, the size range of zero-dimensional nanofillers is 30 nm to 50 nm, the size range of one-dimensional nanofillers is 50 nm to 60 nm, the size range of two-dimensional nanofillers is 60 nm to 80 nm, and the specific surface area of ​​two-dimensional nanofillers is 500 m². 2 / g to 1500m 2 / g, the size range of the three-dimensional nanofiller is 80nm to 100nm, and the specific surface area of ​​the three-dimensional material ranges from 500m². 2 / g to 1500m 2 / g; In nanofillers, the size of high-dimensional nanofillers is larger than that of low-dimensional nanofillers.

[0032] The zero-dimensional, one-dimensional, two-dimensional, or three-dimensional nanofillers used in this embodiment are within the aforementioned size range. This allows the nanofillers to be uniformly dispersed in the barrier layer and to better cooperate with each other to form a labyrinthine three-dimensional barrier structure, effectively blocking water, oxygen, and other components. Furthermore, from three-dimensional to zero-dimensional nanofillers, as the dimensionality of the nanofillers decreases, their size also gradually decreases. This allows the lower-dimensional nanofillers to fill the gaps formed by the higher-dimensional nanofillers effectively, increasing the density of the barrier structure formed by multiple nanofillers and enhancing its water and oxygen barrier effect. It should be noted that for zero-dimensional and three-dimensional nanofillers, the above size range refers to the overall size of the nanofiller being within the above range; for one-dimensional nanomaterials, the above size range refers to the size of the nanofiller in its extension direction (or axial direction) being within the above range, while the size of the nanofiller perpendicular to its extension direction (or radial direction) is not limited by the above range, and the size of the nanofiller in its extension direction (or radial direction) should be much smaller than the corresponding range; similarly, for two-dimensional nanomaterials, the above size range refers to the size of the nanofiller in its planar direction being within the above range, while the size of the nanofiller in its thickness direction is not limited by the above range, and the size of the nanofiller in its thickness direction should be much smaller than the corresponding range.

[0033] As an alternative implementation, when the nanofiller includes two-dimensional nanofillers, the weight of the two-dimensional nanofiller accounts for 50% to 60% of the total weight of the nanofiller.

[0034] As an alternative implementation, when the nanofiller includes three-dimensional nanofillers, the weight percentage of the two-dimensional nanofiller in the total weight of the nanofiller ranges from 30% to 50%.

[0035] As an alternative implementation, when the nanofiller includes four-dimensional nanofillers, the weight of the two-dimensional nanofiller accounts for 20% to 30% of the total weight of the nanofiller.

[0036] The weight percentage of the two-dimensional nanofiller is within the above range, which can ensure that the amount of two-dimensional nanofiller added is within a suitable range, and avoid the water and oxygen barrier effect of the barrier layer being affected by insufficient two-dimensional nanofiller.

[0037] As an optional implementation, the two-dimensional nanofiller can be selected from at least one of graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, black scale, or layered double hydroxides. All of the above nanofillers are layered fillers, and the layered fillers dispersed in the polymer matrix can form a barrier layer structure, achieving a barrier effect against components such as water and oxygen. Furthermore, multi-layer stacking can further enhance the barrier effect against water and oxygen. The two-dimensional nanofiller plays a crucial role in achieving water and oxygen barrier effects within the barrier layer, while other dimensional nanofillers work synergistically with the two-dimensional nanofiller to comprehensively improve the water and oxygen barrier effect of the barrier layer.

[0038] As an optional implementation, the three-dimensional nanofiller can be selected from at least one of aerogels or molecular sieves. Aerogels possess a nanoscale porous network structure, which can effectively inhibit the free movement of gas molecules, thereby reducing the permeation rate of oxygen and water vapor to a certain extent. Simultaneously, when aerogels are combined with a polymer matrix, they can form a "maze-like" barrier structure, extending the diffusion path of water and oxygen and improving the overall barrier performance. Molecular sieves have a uniform microporous structure, capable of adsorbing gases such as oxygen and water vapor, and can continuously capture trace amounts of water and oxygen that permeate in. Furthermore, molecular sieves have a high water absorption capacity and maintain strong adsorption even at low humidity levels, allowing them to better adsorb water vapor and prevent it from passing through the barrier layer.

[0039] As an optional implementation, the one-dimensional nanofiller can be selected from at least one of carbon nanotubes, silver nanowires, gold nanorods, or nanofibers. The aforementioned one-dimensional nanofillers possess a high aspect ratio and dense stacking capability. In the barrier layer, the one-dimensional nanofiller can fill the gaps formed by the high-dimensional nanofillers and synergistically cooperate with the two-dimensional and other dimensional nanofillers in the polymer matrix to form a "maze-like" barrier structure, extending the propagation path of water vapor and oxygen, and improving the barrier layer's barrier effect on components such as water and oxygen.

[0040] As an optional implementation, the zero-dimensional nanofiller can be selected from at least one of carbon quantum dots, graphene quantum dots, gold nanoparticles, silver nanoparticles, silica nanoparticles, titanium dioxide nanoparticles, or zinc oxide nanoparticles. These zero-dimensional nanofillers have a small size and can fill the voids formed by two-dimensional nanofillers and other high-dimensional nanofillers. By working in conjunction with high-dimensional nanofillers, they further enhance the complexity of the "maze-like" barrier structure, improve the barrier effect, and extend the propagation path of water vapor and oxygen, thereby enhancing the barrier layer's barrier effect against components such as water and oxygen.

[0041] As an optional implementation, the base film layer has a micron-scale textured structure on at least one side of its surface near the undercoating layer. The micron-scale textured structure on the surface of the base film layer has at least two beneficial effects: firstly, it enhances the adhesion between the base film layer and adjacent film layers; secondly, it increases water vapor condensation nuclei, causing water vapor to condense on the surface of the textured structure instead of permeating through the base film layer, or it delays permeation by altering the surface tension of water vapor on the base film layer surface. The textured structure in the base film layer can be obtained using conventional techniques, such as imprinting, laser etching, or sandblasting. The obtained textured structure can be either a regularly shaped and regularly distributed textured structure or an irregularly shaped and irregularly distributed textured structure.

[0042] As an optional implementation, the depth of the recessed portion in the textured structure ranges from 5 μm to 10 μm, and the height of the raised portion ranges from 5 μm to 10 μm. The dimensions of the recessed and raised portions in the textured structure are within these ranges, which satisfies both the requirement to enhance the bonding force with adjacent layers and the purpose of providing condensation nuclei for water vapor, thereby increasing the water vapor barrier capacity of the base film layer.

[0043] As an optional implementation, the thickness of the base film layer ranges from 200 μm to 300 μm, the thickness of the undercoat layer ranges from 500 nm to 1000 nm, and the thickness of the barrier layer ranges from 300 nm to 1000 nm. Within these ranges, the thickness of the base film layer serves as a support layer for the barrier film, ensuring the overall mechanical strength of the barrier film. The thickness of the undercoat layer, within these ranges, provides sufficient bonding strength between the base film layer and the barrier layer while avoiding increasing the overall thickness of the barrier film. The thickness of the barrier layer, within these ranges, satisfies the barrier effect against components such as water and oxygen while also avoiding increasing the overall thickness of the barrier film.

[0044] As an optional implementation, the base film layer can be selected from PET film, PP film, PC film, or PE film. These polymer film materials possess high mechanical strength and good dimensional stability, and are widely used as base films for membrane materials. PP film and PE film themselves also have good water vapor barrier properties, and using them as base films can further enhance the water vapor barrier effect of the barrier film material.

[0045] As an optional implementation, the raw materials for preparing the primer coating include 10 to 15 parts by weight of a base resin, 3 to 5 parts by weight of a curing agent, 0.1 to 0.15 parts by weight of a leveling agent, 0.15 to 0.2 parts by weight of a pH adjuster, and 0.5 to 0.65 parts by weight of primer coating additives. The primer coating prepared from the above raw materials can meet both the requirements of low cost and the corresponding requirements of adhesion and appearance.

[0046] As an optional implementation, the raw materials for preparing the barrier layer include 20 to 30 parts by weight of a polymer matrix, 4 to 8 parts by weight of nanofillers, and 1 to 2 parts by weight of barrier layer additives. The primer layer prepared from the above raw materials can meet both the requirements of low cost and the corresponding requirements of water and oxygen barrier as well as appearance.

[0047] As an optional implementation, the matrix resin can be selected from waterborne polyurethane dispersions, waterborne acrylic dispersions, polyurethane-acrylic hybrid dispersions, or acrylic-modified polyurethane. Waterborne polyurethane dispersions possess excellent flexibility and elasticity, as well as good crack resistance. As a base layer, the matrix resin can provide better adhesion between the base film layer and the barrier layer. Waterborne acrylic dispersions exhibit excellent weather resistance and water resistance, maintaining stable performance in high-moisture environments and preventing cracking between the base film layer and the barrier layer; simultaneously, waterborne acrylic dispersions also have high surface hardness, providing good support for the barrier layer. Polyurethane-acrylic hybrid dispersions combine the flexibility of polyurethane with the water resistance of acrylic, exhibiting both good crack resistance and stable performance in high-moisture environments. Acrylic-modified polyurethane also combines the strong adhesion and flexibility of polyurethane with the water resistance and weather resistance of acrylic, while exhibiting superior adhesion to base films made of materials such as PET, thus improving the interlayer peel strength in the barrier film material. The curing agent may be selected from at least one of hydrophilically modified aliphatic waterborne polyisocyanates, aziridine crosslinking agents, carbodiimide crosslinking agents, or oxazoline crosslinking agents. The leveling agent may be selected from at least one of silicone leveling agents, acrylic leveling agents, or fluorocarbon surfactants. The pH adjuster may be selected from at least one of inorganic base adjusters or organic amine adjusters. The primer coating additive may be selected from either silica sol or core-shell structured polystyrene.

[0048] As an optional implementation, the polymer matrix includes one of waterborne polyurethane, polyvinyl alcohol, polyimide, or acrylic emulsion. Waterborne polyurethane possesses excellent film-forming flexibility and elasticity, as well as good flexural and crack resistance. Furthermore, waterborne polyurethane exhibits good bonding ability with nanofillers, allowing it to work synergistically to achieve excellent barrier effects. Polyvinyl alcohol itself has good oxygen barrier properties, and the polymer matrix used as a barrier layer can enhance the oxygen barrier effect. Polyimide itself has good water and oxygen barrier properties, high mechanical strength, and ultra-high thermal stability, maintaining good performance even under high temperature and high humidity environments. Acrylic emulsion has good weather resistance and can achieve good water and oxygen barrier properties when combined with nanofillers. Barrier layer additives include silane coupling agents.

[0049] Another aspect of this application provides a method for preparing a barrier film material, the method comprising the following steps: Preparation of the base coating slurry: The raw materials for preparing the base coating are mixed with a diluent and stirred evenly to obtain the base coating slurry; Barrier layer slurry preparation: The raw materials for preparing the base layer are mixed with a diluent and stirred evenly to obtain the base layer slurry; The membrane material is prepared by coating a base coating slurry onto a base membrane layer and drying it to form a base coating layer, and then coating a barrier layer slurry onto the side of the base coating layer away from the base membrane layer and drying it to form a barrier layer.

[0050] The barrier membrane material in this embodiment is basically formed by sequentially coating a base layer slurry and a barrier layer slurry onto a substrate layer. The diluent used primarily serves as a dispersion medium for the raw materials and is largely removed in subsequent processing. The diluent can be selected based on the matrix resin or polymer matrix used. Specifically, for aqueous matrix resins and polymer matrices, ordinary water, deionized water, or distilled water can be selected. It should be understood that when the polymer matrix is ​​polyimide, the barrier layer slurry can be prepared from a polyamic acid precursor and then subjected to imidization treatment to obtain the barrier layer. Alternatively, the barrier layer slurry can be prepared from modified water-soluble polyimide, or it can be prepared from a polyimide dispersion or a polyimide suspension.

[0051] As an optional implementation method, during the preparation of the barrier layer raw materials, the order of adding nanofillers is as follows: high-dimensional nanofillers are added first, followed by low-dimensional nanofillers. Each high-dimensional nanofiller is mixed evenly with other components before the next low-dimensional nanofiller is added and mixed uniformly. Adding high-temperature nanofillers first, followed by low-dimensional nanofillers, allows the later-added low-dimensional nanofillers to embed into the gaps formed by the accumulation of high-temperature nanofillers, filling these gaps and increasing the density of the barrier layer. It also allows the formation of a complex "maze-like" barrier structure within the barrier layer, increasing the path length for water, oxygen, and other substances to pass through, thus improving the barrier layer's effectiveness in blocking these components.

[0052] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited to the embodiments. It should be noted that the parts in the following proportions are all parts by weight.

[0053] Example 1 This embodiment provides a barrier membrane material, the structure of which includes three layers, from top to bottom: a substrate layer, an aqueous primer layer, and a nano barrier layer.

[0054] The substrate layer has a raised pattern on its surface, with the recessed part of the raised pattern having a depth of 7μm and the raised part having a height of 8μm; the substrate layer is a PET film with a thickness of 250μm.

[0055] The primer coating formulation includes 10.8 parts of waterborne polyurethane emulsion, 3.1 parts of hydrophilic modified blocked polyisocyanate, 0.24 parts of silica sol, 0.4 parts of core-shell structured polystyrene, 0.1 parts of leveling agent, 85 parts of deionized water, and 0.16 parts of pH adjuster; the primer coating thickness is 800 nm.

[0056] The formulation of the nano-barrier layer includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, 1.02 parts carbon nanotubes, 1.02 parts silica aerogel, 1.44 parts graphene, and 0.5 parts silane coupling agent. The silica particles have a particle size of 35 nm; the carbon nanotubes have a length of 53 nm and an aspect ratio of 1.17:1; the graphene has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; The silica aerogel has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0057] Example 2 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0058] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.7 parts silver nanowires, 1.7 parts carbon aerogel, 2.6 parts molybdenum disulfide, and 0.5 parts silane coupling agent. The silver nanowires have a length of 53 nm and an aspect ratio of 1.17:1. The molybdenum disulfide has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; The carbon aerogel has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0059] Example 3 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0060] The formulation of the nano-barrier layer includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 2.22 parts gold nanorods, 2.78 parts tungsten disulfide, and 0.5 parts silane coupling agent. The gold nanorods have a length of 53 nm and an aspect ratio of 1.17:1. The tungsten disulfide has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m² / g. The thickness of the nano-barrier layer is 450 μm.

[0061] Example 4 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0062] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, and 1.44 parts graphene. The silica nanoparticles have a particle size of 35 nm, the graphene has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0063] Example 5 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0064] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.44 parts graphene, and 1.02 parts silica aerogel; the graphene has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; The silica aerogel has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0065] Example 6 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0066] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, 1.44 parts graphene, 1.02 parts silica aerogel, and 0.5 parts silane coupling agent. The silica nanoparticles have a particle size of 35 nm; the graphene has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; The silica aerogel has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0067] Example 7 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0068] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, 1.02 parts carbon nanotubes, 1.44 parts graphene, and 0.5 parts silane coupling agent. The silica nanoparticles have a particle size of 35 nm; the carbon nanotubes have a length of 53 nm and an aspect ratio of 1.17:1; the graphene has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; the thickness of the nano barrier layer is 450μm.

[0069] Example 8 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the substrate layer, which differs from that in Example 1, all other conditions are the same as in Example 1.

[0070] The substrate layer is a smooth PET film without any textured surface.

[0071] Example 9 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the substrate layer, which differs from that in Example 1, all other conditions are the same as in Example 1.

[0072] The substrate layer is a PET film with a concave pattern, and the depth of the recessed part in the concave pattern is 8μm.

[0073] Example 10 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the substrate layer, which differs from that in Example 1, all other conditions are the same as in Example 1.

[0074] The substrate layer is a PET film with a raised pattern, and the depth of the raised part in the raised pattern is 8μm.

[0075] Example 11 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0076] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, 1.02 parts carbon nanotubes, 1.02 parts silica aerogel, 1.44 parts graphene, and 0.5 parts silane coupling agent. The silica particles have a particle size of 30 nm; the carbon nanotubes have a length of 50 nm and an aspect ratio of 1.17:1; the graphene has a length of 60 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​1500 m². 2 / g; The silica aerogel has a length of 80nm, a width of 80nm, a height of 80nm, and a specific surface area of ​​1500m². 2 / g.

[0077] Example 12 This embodiment provides a barrier membrane material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for the nano barrier layer, which differs from that in Embodiment 1, all other conditions are the same as in Embodiment 1.

[0078] The nano-barrier layer formulation includes 70 parts deionized water, 20 parts aqueous polyvinyl alcohol solution, 5 parts aqueous polyurethane dispersion, 1.02 parts silica nanoparticles, 1.02 parts carbon nanotubes, 1.02 parts silica aerogel, 1.44 parts graphene, and 0.5 parts silane coupling agent. The silica particles have a particle size of 50 nm; the carbon nanotubes have a length of 60 nm and an aspect ratio of 1.17:1; the graphene has a length of 80 nm, a width of 80 nm, a thickness of 0.1 nm, and a specific surface area of ​​500 m². 2 / g; The silica aerogel has a length of 100nm, a width of 100nm, a height of 100nm, and a specific surface area of ​​500m². 2 / g.

[0079] Example 13 This embodiment provides a barrier film material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for adjusting the materials of the substrate layer, primer layer, and nano barrier layer, all other conditions are the same as in Example 1.

[0080] The substrate layer is made of PP film.

[0081] The formulation of the primer layer includes 10.8 parts of water-based acrylic dispersion, 3.1 parts of aziridine crosslinking agent, 0.24 parts of silica sol, 0.1 parts of organosilicon leveling agent, 85 parts of deionized water, and 0.16 parts of inorganic alkali modifier.

[0082] The formulation of the nano-barrier layer includes 70 parts deionized water, 25 parts polyimide, 1.02 parts carbon quantum dots, 1.02 parts carbon nanotubes, 1.44 parts hexagonal boron nitride, 1.02 parts silica aerogel, and 0.5 parts silane coupling agent. The carbon quantum dots have a particle size of 35 nm; the carbon nanotubes have a length of 53 nm and an aspect ratio of 1.17:1; the hexagonal boron nitride has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; The silica aerogel has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g.

[0083] Example 14 This embodiment provides a barrier film material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for adjusting the materials of the substrate layer, primer layer, and nano barrier layer, all other conditions are the same as in Example 1.

[0084] The substrate layer is made of PC film.

[0085] The primer formulation includes 10.8 parts of polyurethane-acrylic hybrid dispersion, 3.1 parts of carbodiimide crosslinking agent, 0.64 parts of core-shell structured polystyrene, 0.1 parts of acrylic leveling agent, 85 parts of deionized water, and 0.16 parts of organic amine modifier.

[0086] The formulation of the nano-barrier layer includes 70 parts deionized water, 25 parts polyvinyl alcohol, 1.02 parts graphene quantum dots, 1.02 parts carbon nanotubes, 1.44 parts black phosphorus, 1.02 parts molecular sieve, and 0.5 parts silane coupling agent; the graphene quantum dots have a particle size of 35 nm; the carbon nanotubes have a length of 53 nm and an aspect ratio of 1.17:1; the black phosphorus has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; the molecular sieve has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g.

[0087] Example 15 This embodiment provides a barrier film material, the structure of which includes three layers: a substrate layer, an aqueous primer layer, and a nano barrier layer, from top to bottom. Except for adjusting the materials of the substrate layer, primer layer, and nano barrier layer, all other conditions are the same as in Example 1.

[0088] The substrate layer is made of PE film.

[0089] The formulation of the primer layer includes 10.8 parts of acrylic modified polyurethane, 3.1 parts of oxazoline crosslinking agent, 0.4 parts of silica sol, 0.24 parts of core-shell structured polystyrene, 0.1 parts of fluorocarbon surfactant, 85 parts of deionized water, and 0.16 parts of organic amine modifier.

[0090] The formulation of the nano-barrier layer includes 70 parts deionized water, 25 parts acrylic emulsion, 1.02 parts titanium dioxide nanoparticles, 1.02 parts carbon nanotubes, 1.44 parts hexagonal boron nitride, 1.02 parts molecular sieve, and 0.5 parts silane coupling agent. The titanium dioxide nanoparticles have a particle size of 35 nm; the carbon nanotubes have a length of 53 nm and an aspect ratio of 1.17:1; the hexagonal boron nitride has a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g; the molecular sieve has a length of 95nm, a width of 81nm, a height of 81nm, and a specific surface area of ​​901m². 2 / g.

[0091] Comparative Example 1 This comparative example provides a barrier film material with a structure comprising two layers: a PET substrate layer and a nano barrier layer, from top to bottom. Except for the absence of a base coating layer, all other conditions are the same as in Example 1.

[0092] Comparative Example 2 This comparative example provides a barrier film material with a structure comprising two layers: a PET substrate layer and an aqueous primer layer, from top to bottom. Except for the absence of the nano-barrier layer, all other conditions are the same as in Example 1.

[0093] Comparative Example 3 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only two-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0094] The two-dimensional nanofiller was selected as 4.8 parts of graphene, with a length of 75 nm, a width of 60 nm, a thickness of 0.1 nm, and a specific surface area of ​​890 m². 2 / g.

[0095] Comparative Example 4 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only zero-dimensional nanofillers to the nano barrier layer without any other nanofillers, all other conditions are the same as in Example 1.

[0096] The zero-dimensional nanofiller consists of 4.8 parts of silica particles with a particle size of 35 nm.

[0097] Comparative Example 5 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only one-dimensional nanofiller to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0098] The one-dimensional nanofiller consists of 1.02 parts of carbon nanotubes with a length of 53 nm and an aspect ratio of 1.17:1.

[0099] Comparative Example 6 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only three-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0100] The three-dimensional nanofiller consists of 1.02 parts of silica aerogel, with a length of 95 nm, a width of 81 nm, a height of 81 nm, and a specific surface area of ​​901 m². 2 / g.

[0101] Comparative Example 7 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only zero-dimensional and one-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0102] The zero-dimensional nanofiller consists of 1.02 parts of silica nanoparticles with a particle size of 35 nm; the one-dimensional nanofiller consists of 1.02 parts of carbon nanotubes with a length of 53 nm and an aspect ratio of 1.17:1.

[0103] Comparative Example 8 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only zero-dimensional and three-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0104] The zero-dimensional nanofiller consists of 1.02 parts of silica nanoparticles with a particle size of 35 nm; the three-dimensional nanofiller consists of 1.02 parts of silica aerogel with a length of 95 nm, a width of 81 nm, a height of 81 nm, and a specific surface area of ​​901 m². 2 / g.

[0105] Comparative Example 9 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only one-dimensional and three-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0106] The one-dimensional nanofiller consists of 1.02 parts of carbon nanotubes with a length of 53 nm and an aspect ratio of 1.17:1; the three-dimensional nanofiller consists of 1.02 parts of silica aerogel with a length of 95 nm, a width of 81 nm, a height of 81 nm, and a specific surface area of ​​901 m². 2 / g.

[0107] Comparative Example 10 This comparative example provides a barrier film material with a three-layer structure, consisting of a PET substrate layer, an aqueous primer layer, and a nano barrier layer from top to bottom. Except for the addition of only zero-dimensional, one-dimensional, and three-dimensional nanofillers to the nano barrier layer without other nanofillers, all other conditions are the same as in Example 1.

[0108] The zero-dimensional nanofiller consists of 2.6 parts of silica nanoparticles with a particle size of 35 nm; the one-dimensional nanofiller consists of 1.7 parts of silver nanowires and carbon nanotubes with a length of 53 nm and an aspect ratio of 1.17:1; the three-dimensional nanofiller consists of 1.02 parts of silica aerogel with a length of 95 nm, a width of 81 nm, a height of 81 nm, and a specific surface area of ​​901 m². 2 / g.

[0109] Performance testing Performance testing methods: The following test methods were used to test the performance of the base coating, barrier layer, and the entire barrier membrane.

[0110] Base coat performance testing requirements: (1) Viscosity: The rotational viscometer is used for testing. The viscous resistance torque experienced by the rotor (or cone, plate) immersed in the ink during constant rotation is measured, and the viscosity value is directly obtained through conversion. High-end rotational viscometers can also plot rheological curves by changing the rotational speed (shear rate) to analyze the thixotropic, pseudoplastic, and other behaviors of the ink. Generally, a viscosity of 50-220 s is required (based on the measurement of Forecast-4 cup).

[0111] (2) Solid content: Take a certain mass (W1) of coating and bake it at a specific temperature (e.g., 105±2℃) until constant weight, and weigh the remaining solid mass (W2). Solid content = (W2 / W1)×100%.

[0112] (3) Storage stability: After the coating sample is aged at 50°C for a period of time for one month, observe whether gelation occurs.

[0113] (4) Adhesion: Use a special crisscross tool to cut 1mm×1mm or 2mm×2mm squares (to the substrate) on the PET film coated with primer and dried. Apply special tape (such as 3M 610), and quickly peel it off at a specific angle and speed. Observe the square peeling rate. Grade 0 (no peeling) is the best, and Grade 5 (peeling >65%) is the worst.

[0114] (5) Transparency / Haze: Measured using a haze meter. Apply the primer to transparent PET, and measure its haze and light transmittance after drying.

[0115] (6) Surface tension: Use a dyne pen. Draw on the dry film with a dyne pen of different surface tension values. If the ink line does not shrink into a droplet within 2 seconds, it indicates that the surface tension of the coating is greater than or equal to the value of the dyne pen.

[0116] (7) Pencil Hardness: Select a pencil and sharpen it with a pencil sharpener. Place the pencil vertically on sandpaper and gently grind it in small circular motions until a flat, smooth, and sharp cylindrical cross-section is obtained. After attaching the pencil, push the tester forward smoothly at a speed of 1 cm / s to draw a mark about 6-7 mm long. Gently erase the mark with a soft cloth or eraser (be careful not to rub the coating forcefully), and observe the coating surface with the naked eye under good lighting (usually requiring a specific angle of sidelight). Start testing with softer pencils (such as B or HB) and gradually switch to harder pencils. The pencil hardness of the coating is equal to the grade of the hardest pencil that failed to scratch the coating.

[0117] Barrier layer performance testing requirements: (1) Thermal stability test: Under a pressure of 1.82 MPa, the temperature at which the sample deforms under heat to the specified value is determined.

[0118] (2) Adhesion test: Use a cross-cutting knife to cut 1mm×1mm squares (100 small squares) on the PET surface (if there is a composite barrier layer), apply 3M tape and quickly peel it off, observe the squares falling off. High barrier PET should reach level 0 (no falling off) to ensure that the barrier layer does not peel off.

[0119] Barrier membrane material performance testing requirements: (1) Oxygen Transmission Rate (OTR) Test: A "three-chamber" structure is adopted, in which the PET sample is fixed in the middle, and a test gas containing oxygen is introduced into one side, while an inert carrier gas (such as nitrogen) is introduced into the other side. After the oxygen permeates through the sample, it is carried into the coulometer by the carrier gas, and the amount of oxygen permeating per unit time is calculated by detecting the change in current.

[0120] (2) Water vapor transmission rate (WVTR) test: The sample is divided into a "high humidity chamber" (saturated water vapor is introduced) and a "dry chamber" (dry nitrogen is introduced). After the water vapor passes through the sample, it is carried into the electrolysis sensor by the nitrogen. The transmission amount is calculated by the amount of electricity consumed by the electrolysis of water vapor.

[0121] Performance test results: The performance test results of the barrier membrane materials in Examples 1 to 3 and Comparative Examples 1 to 6 are shown in Table 1 below.

[0122] Table 1 Performance test results of Examples 1 to 15 and Comparative Examples 1 to 10

[0123] As shown in Table 1 above, compared with the barrier membrane materials in Comparative Examples 1 to 10, the barrier membrane materials in Examples 1 to 15 of this application have stronger comprehensive performance, especially with superior water and oxygen barrier effects.

[0124] Finally, it should be noted that the above are only some preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A barrier membrane material, characterized in that, include: A base film layer having two opposing surfaces in the thickness direction; A base coating layer, wherein the base coating layer is located on one side of the base film layer and is adhered to the surface of the base film layer; A barrier layer is located on the side of the base coating layer away from the base film layer and is attached to the base coating layer. The barrier layer includes a polymer matrix and nanofillers. The nanofillers include at least two of zero-dimensional nanofillers, one-dimensional nanofillers, two-dimensional nanofillers, or three-dimensional nanofillers, and must include two-dimensional nanofillers.

2. The barrier membrane material according to claim 1, characterized in that: The zero-dimensional nanofiller has a size range of 30 nm to 50 nm, the one-dimensional nanofiller has a size range of 50 nm to 60 nm, the two-dimensional nanofiller has a size range of 60 nm to 80 nm, and the specific surface area of ​​the two-dimensional nanofiller is in the range of 500 m². 2 / g to 1500m 2 / g, the size range of the three-dimensional nanofiller is 80nm to 100nm, and the specific surface area of ​​the three-dimensional material is 500m². 2 / g to 1500m 2 / g; In the nanofillers, the size of the high-dimensional nanofillers is larger than that of the low-dimensional nanofillers.

3. The barrier membrane material according to claim 1, characterized in that: When the nanofiller includes two dimensions of nanofiller, the weight of the two-dimensional nanofiller accounts for a percentage of the total weight of the nanofiller ranging from 50% to 60%; and / or, When the nanofiller includes nanofillers of three dimensions, the weight percentage of the two-dimensional nanofiller accounts for 30% to 50% of the total weight of the nanofiller; and / or, When the nanofiller includes four dimensions, the weight of the two-dimensional nanofiller accounts for a percentage of the total weight of the nanofiller ranging from 20% to 30%.

4. The barrier membrane material according to claim 1, characterized in that: The zero-dimensional nanofiller includes at least one of carbon quantum dots, graphene quantum dots, gold nanoparticles, silver nanoparticles, silica nanoparticles, titanium dioxide nanoparticles, or zinc oxide nanoparticles; and / or, The one-dimensional nanofiller includes at least one of carbon nanotubes, silver nanowires, gold nanorods, or nanofibers; and / or, The two-dimensional nanofiller includes at least one of graphene, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, black scale, or layered double hydroxides; and / or, The three-dimensional nanofiller includes at least one of aerogel or molecular sieve.

5. The barrier membrane material according to claim 1, characterized in that: The base film layer has a micron-scale textured structure on at least one side of the surface near the undercoating layer.

6. The barrier membrane material according to claim 1, characterized in that: The depth of the recessed portion in the embossed pattern structure ranges from 5 μm to 10 μm, and the height of the raised portion in the embossed pattern structure ranges from 5 μm to 10 μm.

7. The barrier membrane material according to claim 1, characterized in that: The thickness of the base film layer ranges from 200 μm to 300 μm, the thickness of the bottom coating layer ranges from 500 nm to 1000 nm, and the thickness of the barrier layer ranges from 300 nm to 1000 nm.

8. The barrier membrane material according to claim 1, characterized in that: The raw materials for preparing the base coating include 10 to 15 parts by weight of a matrix resin, 3 to 5 parts by weight of a curing agent, and 0.1 to 1 part by weight of an additive; and / or, The raw materials for preparing the barrier layer include 20 to 30 parts by weight of polymer matrix, 4 to 8 parts by weight of nanofiller and 1 to 2 parts by weight of barrier layer additive. Preferably, the matrix resin comprises one of an aqueous polyurethane dispersion, an aqueous acrylic dispersion, a polyurethane-acrylic hybrid dispersion, or an acrylic-modified polyurethane; the curing agent comprises at least one of a hydrophilic modified aliphatic aqueous polyisocyanate, an aziridine crosslinking agent, a carbodiimide crosslinking agent, or an oxazoline crosslinking agent; the additives comprise leveling agents, pH adjusters, and primer coating additives; the leveling agent comprises at least one of an organosilicon leveling agent, an acrylic leveling agent, or a fluorocarbon surfactant; the pH adjuster comprises at least one of an inorganic base adjuster or an organic amine adjuster; the primer coating additive comprises one of silica sol or a core-shell structured polystyrene; the polymer matrix comprises one of an aqueous polyurethane, polyvinyl alcohol, polyimide, or an acrylic emulsion; and the barrier layer additive comprises a silane coupling agent.

9. A method for preparing a barrier membrane material as described in any one of claims 1 to 8, characterized in that... Includes the following steps: Preparation of the base coating slurry: The raw materials for preparing the base coating are mixed with a diluent and stirred evenly to obtain the base coating slurry; Barrier layer slurry preparation: The raw materials for preparing the base layer are mixed with a diluent and stirred evenly to obtain the base layer slurry; Membrane material preparation: coating the base film layer with the base coating slurry to form the base coating layer, and coating the barrier layer slurry on the side of the base coating layer away from the base film layer to form the barrier layer.

10. The preparation method according to claim 9, characterized in that: In the preparation process of the barrier layer raw material, the order of adding the nanofillers is as follows: first add high-dimensional nanofillers and then add low-dimensional nanofillers. After the high-dimensional nanofiller is mixed evenly with other components, the next low-dimensional nanofiller is added and mixed evenly.

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