High-barrier-property flexible fabric membrane material and preparation method thereof

Abstract

The invention belongs to the technical field of membrane materials, and discloses a high-barrier-property flexible fabric membrane material and a preparation method thereof. The high-barrier-property flexible fabric membrane material sequentially comprises a flexible base cloth layer, a first bonding layer, a first barrier layer, a second bonding layer and a second barrier layer from bottom to top, the preparation process of the first barrier layer comprises the following steps: mixing water-based hydroxy acrylic resin, an ethylene-vinyl alcohol copolymer, a modified filler, an auxiliary agent and a solvent to obtain first slurry, then coating one surface of the first bonding layer with the first slurry, and drying to obtain the first barrier layer; the preparation process of the second barrier layer comprises the following steps: mixing water-based hydroxy acrylic resin, polyvinylidene chloride, a modified filler, an auxiliary agent and a solvent to obtain second barrier slurry, then coating one surface of the second bonding layer with the second barrier slurry, and drying to obtain the second barrier layer. The high-barrier-property flexible fabric membrane material has good barrier property to oxygen and water vapor, and also has good flexibility, so that the high-barrier-property flexible fabric membrane material has wide application.

Description

Technical Field

[0001] The present invention belongs to the technical field of film materials, and particularly relates to a high-barrier flexible fabric film material and a preparation method thereof. Background Art

[0002] Flexible film materials with the functions of blocking oxygen and water vapor are widely used. For example, they can be used in medical protective clothing, food and drug packaging, solar cell encapsulation, or flexible electronic device encapsulation. Encapsulating solar cells can prevent moisture and oxygen from eroding the battery components and improve long-term stability. Encapsulating flexible electronic devices, such as for OLED and QLED displays and wearable devices, can prevent water and oxygen penetration from causing component failure.

[0003] However, the existing flexible film materials generally have a mediocre function of blocking oxygen and water vapor. For example, the water vapor transmission rate generally exceeds 0.035 g / m 2 ·24 h, and the oxygen transmission rate often exceeds 0.08 cm 3 / m 2 ·24 h·0.1 MPa.

[0004] Therefore, there is an urgent need to provide a high-barrier flexible fabric film material with good functions of blocking oxygen and water vapor. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. For this purpose, the present invention provides a high-barrier flexible fabric film material and a preparation method thereof. The high-barrier flexible fabric film material of the present invention has good barrier properties to oxygen and water vapor, and also has good flexibility, making the high-barrier flexible fabric film material have a wide range of applications.

[0006] The first aspect of the present invention provides a high-barrier flexible fabric film material.

[0007] A high-barrier flexible fabric film material, from bottom to top, sequentially includes a flexible base fabric layer, a first adhesive layer, a first barrier layer, a second adhesive layer, and a second barrier layer;

[0008] The preparation process of the first barrier layer includes: mixing an aqueous hydroxy acrylic resin, an ethylene-vinyl alcohol copolymer (EVOH), a modified filler, an auxiliary agent, and a solvent to obtain a first slurry, and then coating it on one side of the first adhesive layer and drying to obtain the first barrier layer;

[0009] The preparation process of the second barrier layer includes: mixing an aqueous hydroxy acrylic resin, polyvinylidene chloride (PVDC), a modified filler, an auxiliary agent, and a solvent to obtain a second barrier slurry, and then coating it on one side of the second adhesive layer and drying to obtain the second barrier layer;

[0010] The preparation process of the modified filler includes: mixing montmorillonite nanosheets, nano molybdenum disulfide, nano alumina, polyvinyl alcohol, silane coupling agent, water, and ethanol, and then drying to obtain the modified filler.

[0011] Preferably, the preparation process of the modified filler includes: mixing montmorillonite nanosheets, nano molybdenum disulfide, nano alumina, polyvinyl alcohol, silane coupling agent, water, and ethanol in a weight ratio of 10:(1 - 5):(1 - 3):(2 - 8):(3 - 9):(20 - 40):(1 - 5), and then drying to obtain the modified filler.

[0012] Preferably, the mixing includes mechanical stirring or ultrasonic mixing.

[0013] Preferably, the silane coupling agent includes at least one of KH550 or KH560.

[0014] Preferably, the drying temperature in the preparation process of the modified filler is 90 - 100 °C, and the time is 3 - 6 hours.

[0015] Preferably, the auxiliary agent includes isocyanate, and at least one of dibutyltin and dibutyltin dilaurate. Dibutyltin and stannous octoate can be used as catalysts to promote the full reaction of hydroxyl substances with isocyanate.

[0016] Preferably, the isocyanate is selected from hexamethylene diisocyanate or toluene diisocyanate.

[0017] Preferably, the preparation process of the first barrier layer includes: mixing aqueous hydroxyl acrylic resin, ethylene - vinyl alcohol copolymer (EVOH), modified filler, auxiliary agent, and solvent in a weight ratio of 50:(5 - 20):(5 - 15):(2 - 10):(40 - 80) to obtain a first slurry, then coating it on one side of the first adhesive layer, and drying to obtain the first barrier layer.

[0018] Preferably, the preparation process of the second barrier layer includes: mixing aqueous hydroxyl acrylic resin, polyvinylidene chloride (PVDC), modified filler, auxiliary agent, and solvent in a weight ratio of 50:(10 - 25):(8 - 18):(2 - 10):(40 - 80) to obtain a second barrier slurry, then coating it on one side of the second adhesive layer, and drying to obtain the second barrier layer.

[0019] Preferably, during the preparation of the first and second barrier layers, the drying temperature is 50-80°C and the drying time is 10-20 hours. At this drying temperature and time, the water-based hydroxylated acrylic resin, ethylene-vinyl alcohol copolymer (EVOH), water-based hydroxylated acrylic resin, and polyvinylidene chloride can undergo a chemical cross-linking reaction with the isocyanate in the additive, thereby forming a dense barrier layer.

[0020] Preferably, the auxiliary agent also includes polydimethylsiloxane and sodium lauryl sulfate, which helps to improve the compatibility of the components.

[0021] Preferably, the solvent comprises at least one of ethyl acetate, ethanol and tetrahydrofuran.

[0022] Preferably, the first and second adhesive layers are composed of polyethylene-grafted maleic anhydride hot melt adhesive. The first and second adhesive layers serve to enhance the bonding strength between the layers, thereby helping to maintain the high-barrier flexible textile membrane's barrier properties against oxygen and water vapor, while also improving the folding resistance of the insulating flexible textile membrane.

[0023] Preferably, the thickness of the first barrier layer is 5-40 μm, more preferably 20-35 μm.

[0024] Preferably, the thickness of the first adhesive layer and the second adhesive layer are both 5-20 μm, more preferably 8-15 μm.

[0025] Preferably, the thickness of the second barrier layer is 20-60 μm, more preferably 30-45 μm.

[0026] Preferably, the flexible base fabric layer is made of polyester fiber (PET), which is woven from polyester fiber to provide mechanical strength and flexible support.

[0027] Preferably, the weight of the flexible base fabric layer is 90-140 g / m 2 , more preferably 100-130g / m 2 .

[0028] Preferably, the raw materials used to prepare the first and second barrier layers also include pentaerythritol. The introduction of pentaerythritol, through a cross-linking reaction with the isocyanate in the additive, enables the modified filler, ethylene-vinyl alcohol copolymer, and polyvinylidene chloride to form a more stable network structure in the barrier layer, thereby improving the oxygen and water vapor barrier properties of the high-barrier flexible textile membrane.

[0029] A second aspect of the present invention provides a method for preparing a high-barrier flexible fabric membrane.

[0030] A method for preparing a high-barrier flexible fabric film material, comprising the following steps:

[0031] (1) Take a flexible base fabric as the flexible base fabric layer;

[0032] (2) Take a hot melt adhesive, heat and melt it, then spray it onto one side of the flexible base fabric layer, and cool it to form a first adhesive layer;

[0033] (3) Mix an aqueous hydroxy acrylic resin, an ethylene-vinyl alcohol copolymer, a modified filler, an auxiliary agent, and a solvent to obtain a first slurry, then coat it on one side of the first adhesive layer, and dry it to obtain a first barrier layer;

[0034] (4) Spray a hot melt adhesive that is heated and melted onto one side of the first barrier layer, and cool it to form a second adhesive layer;

[0035] (5) Mix an aqueous hydroxy acrylic resin, polyvinylidene chloride, a modified filler, an auxiliary agent, and a solvent to obtain a second barrier slurry, then coat it on one side of the second adhesive layer, and dry it to obtain the second barrier layer, then heat and press it at an elevated temperature, and cool it to obtain the high-barrier flexible fabric film material.

[0036] Preferably, in step (2), the corresponding spraying amount is 8-15 g / m 2 .

[0037] Preferably, in step (4), the corresponding spraying amount is 8-15 g / m 2 .

[0038] Preferably, in steps (2) and (4), the temperature of the heating and melting is 160-180 °C, and more preferably 165-170 °C.

[0039] Preferably, the temperature of the heating and pressing at an elevated temperature is 120-140 °C, the pressure is 0.1-0.5 MPa, and the time is 10-40 seconds.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] The high-barrier flexible fabric film material of the present invention sequentially includes a flexible base fabric layer, a first adhesive layer, a first barrier layer, a second adhesive layer, and a second barrier layer from bottom to top; wherein, the first barrier layer is formed by crosslinking an aqueous hydroxy acrylic resin, an ethylene-vinyl alcohol copolymer, and an auxiliary agent, and uniformly dispersing a modified filler to form a dense barrier layer, and the modified filler makes full use of the barrier properties of montmorillonite nanosheets, nano molybdenum disulfide, and nano alumina against oxygen and water vapor. Through the modification treatment with polyvinyl alcohol, silane coupling agent, water, and ethanol, the modified filler can be uniformly dispersed in the dense first barrier layer. The second barrier layer is formed by crosslinking an aqueous hydroxy acrylic resin and an auxiliary agent, and uniformly dispersing polyvinylidene chloride and a modified filler to form a dense barrier layer. Through the cooperation of the first barrier layer and the second barrier layer, the barrier properties of the high-barrier flexible fabric film material against oxygen and water vapor are significantly improved. Moreover, the crosslinking within the barrier layer forms a stable spatial network structure, which is beneficial to improving the folding resistance of the high-barrier flexible fabric film material. Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of the high-barrier flexible fabric film material prepared in Example 1 of the present invention. Detailed Embodiments

[0043] In order to make the technical solutions of the present invention clearer and more understandable to those skilled in the art, the following examples are listed for illustration. It should be noted that the following examples do not limit the scope of protection required by the present invention.

[0044] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial channels or can be obtained by existing known methods.

[0045] Example 1

[0046] A high-barrier flexible fabric film material sequentially includes a flexible base fabric layer, a first adhesive layer, a first barrier layer, a second adhesive layer, and a second barrier layer from bottom to top.

[0047] Figure 1 It is a schematic structural diagram of the high-barrier flexible fabric film material prepared in Example 1 of the present invention, wherein 1 represents the flexible base fabric layer, 2 represents the first adhesive layer, 3 represents the first barrier layer, 4 represents the second adhesive layer, and 5 represents the second barrier layer.

[0048] The compositions of the first adhesive layer and the second adhesive layer are polyethylene grafted maleic anhydride hot melt adhesives, which are obtained through conventional commercial channels.

[0049] The composition of the flexible base fabric layer is polyester fiber (PET), which is woven from polyester fiber.

[0050] The gram weight of the flexible base fabric layer is 110 g / m2 。

[0051] A preparation method of a high-barrier flexible fabric film material, comprising the following steps:

[0052] (1) Take a flexible base fabric (composed of polyester fiber) as the flexible base fabric layer;

[0053] (2) Take a polyethylene grafted maleic anhydride hot melt adhesive, heat and melt it at 165 °C, and then spray (spraying amount is 10 g / m 2 ) onto one side of the flexible base fabric layer, and cool to form the first adhesive layer;

[0054] (3) Mix waterborne hydroxyl acrylic resin, ethylene-vinyl alcohol copolymer (EVOH), modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 3:1:0.2), solvent (the solvent is composed of ethyl acetate and ethanol mixed in a volume ratio of 10:1) and ethyl acetate in a weight ratio of 50:10:8:5:70 at a stirring speed of 500 revolutions per minute, to obtain the first slurry, and then coat (coating amount is 40 g / m 2 ) onto one side of the first adhesive layer, and dry to obtain the first barrier layer;

[0055] (4) Spray (spraying amount is 10 g / m 2 ) the heated and melted polyethylene grafted maleic anhydride hot melt adhesive onto one side of the first barrier layer, and cool to form the second adhesive layer;

[0056] (5) Mix waterborne hydroxyl acrylic resin, polyvinylidene chloride (PVDC), modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 3:1:0.2), solvent (the solvent is composed of ethyl acetate and tetrahydrofuran mixed in a volume ratio of 8:1) in a weight ratio of 50:11:10:6:60 at a stirring speed of 1000 revolutions per minute, to obtain the second barrier slurry, and then coat (coating amount is 55 g / m 2 ) onto one side of the second adhesive layer, and dry to obtain the second barrier layer, and then heat and press at an elevated temperature. The temperature for heating and pressing is 130 °C, the pressure is 0.3 MPa, and the time is 30 seconds. After cooling, a high-barrier flexible fabric film material is obtained;

[0057] Among them, the preparation process of the modified filler includes: stirring and mixing montmorillonite nanosheets, nano molybdenum disulfide, nano alumina, polyvinyl alcohol, silane coupling agent KH550, water, and ethanol in a weight ratio of 10:3:2:5:5:30:4, and drying. The drying temperature is 100 °C and the time is 4 hours to obtain the modified filler.

[0058] Example 2

[0059] A method for preparing a high-barrier flexible fabric film material, comprising the following steps:

[0060] (1) Take a flexible base fabric (composed of polyester fibers) as the flexible base fabric layer (the gram weight of the flexible base fabric layer is 110 g / m 2 );

[0061] (2) Take a polyethylene grafted maleic anhydride hot melt adhesive, heat and melt it at 170 °C, and then spray (the spraying amount is 12 g / m 2 ) onto one side of the flexible base fabric layer, and cool to form the first adhesive layer;

[0062] (3) Stir and mix aqueous hydroxy acrylic resin, ethylene-vinyl alcohol copolymer (EVOH), modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 4:1:0.2), and a solvent (the solvent is composed of ethyl acetate and ethanol mixed in a volume ratio of 8:1) and ethyl acetate in a weight ratio of 50:15:15:5:80 at a stirring speed of 800 revolutions per minute to obtain a first slurry, and then coat (the coating amount is 45 g / m 2 ) onto one side of the first adhesive layer, and dry to obtain the first barrier layer;

[0063] (4) Spray (the spraying amount is 12 g / m 2 ) the heated and melted polyethylene grafted maleic anhydride hot melt adhesive onto one side of the first barrier layer, and cool to form the second adhesive layer;

[0064] (5) Stir and mix aqueous hydroxy acrylic resin, polyvinylidene chloride (PVDC), modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 4:1:0.2), and a solvent (the solvent is composed of ethyl acetate and tetrahydrofuran mixed in a volume ratio of 8:1) in a weight ratio of 50:10:15:6:60 at a stirring speed of 1000 revolutions per minute to obtain a second barrier slurry, and then coat (the coating amount is 60 g / m 2 ) onto one side of the second adhesive layer, dry to obtain the second barrier layer, and then heat and press, the temperature of the heat and press is 130 °C, the pressure is 0.3 MPa, the time is 30 seconds, and cool to obtain the high-barrier flexible fabric film material;

[0065] Among them, the preparation process of the modified filler includes: stirring and mixing montmorillonite nanosheets, nano-molybdenum disulfide, nano-aluminum oxide, polyvinyl alcohol, silane coupling agent KH560, water, and ethanol in a weight ratio of 10:3.5:3:5.5:5:30:6, drying, with the drying temperature being 100 °C and the time being 4 hours, to obtain the modified filler.

[0066] Example 3

[0067] A preparation method of a high-barrier flexible fabric film material includes the following steps:

[0068] (1) Take a flexible base fabric (composed of polyester fibers) as the flexible base fabric layer;

[0069] (2) Take polyvinyl grafted maleic anhydride hot melt adhesive, heat and melt it at 165 °C, and then spray (the spraying amount is 10 g / m 2 ) onto one side of the flexible base fabric layer, and cool to form the first adhesive layer;

[0070] (3) Stir and mix aqueous hydroxy acrylic resin, ethylene-vinyl alcohol copolymer (EVOH), pentaerythritol, modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 3:1:0.2), solvent (the solvent is composed of ethyl acetate and ethanol mixed in a volume ratio of 10:1) and ethyl acetate in a weight ratio of 50:10:3:8:5:70 at a stirring speed of 500 revolutions per minute to obtain the first slurry, and then coat (the coating amount is 40 g / m 2 ) onto one side of the first adhesive layer, and dry to obtain the first barrier layer;

[0071] (4) Spray (the spraying amount is 10 g / m 2 ) the heated and melted polyvinyl grafted maleic anhydride hot melt adhesive onto one side of the first barrier layer, and cool to form the second adhesive layer;

[0072] (5) Stir and mix aqueous hydroxy acrylic resin, polyvinylidene chloride (PVDC), pentaerythritol, modified filler, additives (the additives are composed of toluene diisocyanate, dibutyltin dilaurate, and polydimethylsiloxane in a weight ratio of 3:1:0.2), solvent (the solvent is composed of ethyl acetate and tetrahydrofuran mixed in a volume ratio of 8:1) in a weight ratio of 50:11:5:10:6:60 at a stirring speed of 1000 revolutions per minute to obtain the second barrier slurry, and then coat (the coating amount is 55 g / m 2 ) onto one side of the second adhesive layer, and dry to obtain the second barrier layer, then raise the temperature and hot press, with the temperature of the hot press being 130 °C, the pressure being 0.3 MPa, and the time being 30 seconds, and cool to obtain the high-barrier flexible fabric film material;

[0073] Among them, the preparation process of the modified filler includes: stirring and mixing montmorillonite nanosheets, nano-molybdenum disulfide, nano-aluminum oxide, polyvinyl alcohol, silane coupling agent KH550, water, and ethanol in a weight ratio of 10:3:2:5:5:30:4, drying, with the drying temperature being 100 °C and the time being 4 hours, to obtain the modified filler.

[0074] Comparative Example 1

[0075] Compared with Example 1, the difference in Comparative Example 1 is only that in the preparation process of the second barrier layer, an equal amount of ethylene-vinyl alcohol copolymer (EVOH) is used to replace polyvinylidene chloride (PVDC), and other processes are the same as those in Example 1.

[0076] Comparative Example 2

[0077] Compared with Example 1, the difference in Comparative Example 2 is only that in the preparation process of the modified filler, an equal amount of nano-molybdenum disulfide is used to replace nano-aluminum oxide, and other processes are the same as those in Example 1.

[0078] Comparative Example 3

[0079] Compared with Example 1, the difference in Comparative Example 3 is only that montmorillonite nanosheets, nano-molybdenum disulfide, and nano-aluminum oxide are mixed in a weight ratio of 10:3:2 to obtain a mixed filler, and then an equal amount of the mixed filler is used to replace the modified filler to prepare the first barrier layer and the second barrier layer, and other processes are the same as those in Example 1.

[0080] Product effect test

[0081] Take the high-barrier flexible fabric films (referred to as films) prepared in the above Examples 1-3 and Comparative Examples 1-3, and refer to GB / T26253-2010 to test the water vapor barrier performance of the films, and refer to GB / T1038.1-2022 to test the oxygen barrier performance of the films. The results are shown in Table 1.

[0082] Table 1

[0083]

[0084] As can be seen from Table 1, the films prepared in the examples have better oxygen and water vapor barrier effects compared with the comparative examples.

[0085] As can be seen from Example 1 and Comparative Examples 1-3, the raw material ethylene-vinyl alcohol copolymer (EVOH) in the first barrier layer of the present invention and the raw material polyvinylidene chloride (PVDC) in the second barrier layer cannot be directly interchanged or substituted. The reason may be that the second barrier layer is directly in contact with the atmospheric environment, and polyvinylidene chloride needs to act as one of the components for blocking oxygen and water vapor in the second barrier layer and cooperate with other components to play a good role in blocking oxygen and water vapor. In addition, it can also be seen that in the preparation process of the modified filler of the present invention, different inorganic fillers are combined. After modification, in combination with other organic substances in the barrier layer, the dispersibility of the modified filler can be better, so as to better play the role of the modified filler.

[0086] Further, the film materials of Example 1, Example 3, Comparative Example 1, and Comparative Example 2 were taken, and the flexibility of the film materials was tested by bending at 90 degrees multiple times. The results are shown in Table 2.

[0087] Table 2

[0088]

[0089] As can be seen from Table 2, the film materials prepared in the examples of the present invention have better flexibility compared to the comparative examples.

Claims

1. A high-barrier flexible fabric film material, characterized in that, From bottom to top, it successively includes a flexible base fabric layer, a first adhesive layer, a first barrier layer, a second adhesive layer, and a second barrier layer; The preparation process of the first barrier layer includes: mixing aqueous hydroxy acrylic resin, ethylene-vinyl alcohol copolymer, modified filler, additives, and solvent to obtain a first slurry, and then coating it on one side of the first adhesive layer and drying to obtain the first barrier layer; The preparation process of the second barrier layer includes: mixing aqueous hydroxy acrylic resin, polyvinylidene chloride, modified filler, additives, and solvent to obtain a second barrier slurry, and then coating it on one side of the second adhesive layer and drying to obtain the second barrier layer; The preparation process of the modified filler includes: mixing montmorillonite nanosheets, nano molybdenum disulfide, nano alumina, polyvinyl alcohol, silane coupling agent, water, and ethanol, and drying to obtain the modified filler.

2. The high-barrier flexible fabric film material according to claim 1, characterized in that The preparation process of the modified filler includes: mixing montmorillonite nanosheets, nano molybdenum disulfide, nano alumina, polyvinyl alcohol, silane coupling agent, water, and ethanol in a weight ratio of 10:(1-5):(1-3):(2-8):(3-9):(20-40):(1-5), and drying to obtain the modified filler.

3. The high-barrier flexible fabric film material according to claim 1, characterized in that, The additives include isocyanate and at least one of dibutyltin and dibutyltin dilaurate.

4. The high-barrier flexible fabric film material according to claim 1, wherein The preparation process of the first barrier layer includes: mixing aqueous hydroxy acrylic resin, ethylene-vinyl alcohol copolymer, modified filler, additives, and solvent in a weight ratio of 50:(5-20):(5-15):(2-10):(40-80) to obtain a first slurry, and then coating it on one side of the first adhesive layer and drying to obtain the first barrier layer.

5. The high-barrier flexible fabric film material according to claim 1, wherein The preparation process of the second barrier layer includes: mixing aqueous hydroxy acrylic resin, polyvinylidene chloride, modified filler, additives, and solvent in a weight ratio of 50:(10-25):(8-18):(2-10):(40-80) to obtain a second barrier slurry, and then coating it on one side of the second adhesive layer and drying to obtain the second barrier layer.

6. The high-barrier flexible fabric film material according to claim 1, wherein, In the preparation processes of the first barrier layer and the second barrier layer, the drying temperature is 50-80°C and the drying time is 10-20 hours.

7. The high-barrier flexible fabric film material according to claim 1, characterized in that, The first adhesive layer and the second adhesive layer are composed of polyethylene grafted maleic anhydride hot melt adhesive.

8. The high-barrier flexible fabric film material according to any one of claims 1-7, characterized in that, The thickness of the first barrier layer is 5-40μm; and / or, the thicknesses of the first adhesive layer and the second adhesive layer are both 5-20μm; and / or, the thickness of the second barrier layer is 20-60μm; and / or, the flexible base fabric layer is composed of polyester fiber.

9. The preparation method of the high-barrier flexible fabric film material according to any one of claims 1-8, characterized in that, It includes the following steps: (1) Take a flexible base fabric as the flexible base fabric layer; (2) Take a hot melt adhesive, heat and melt it, then spray it on one side of the flexible base fabric layer and cool it to form the first adhesive layer; (3) Mix aqueous hydroxy acrylic resin, ethylene-vinyl alcohol copolymer, modified filler, additives, and solvent to obtain a first slurry, and then coat it on one side of the first adhesive layer and dry to obtain the first barrier layer; (4) Spray hot-melt adhesive in a heated and molten state on one side of the first barrier layer, and cool to form a second adhesive layer; (5) Mix aqueous hydroxy acrylic resin, polyvinylidene chloride, modified filler, additives, and solvent to obtain a second barrier slurry, then coat it on one side of the second adhesive layer, dry to obtain the second barrier layer, then raise the temperature for hot pressing, and cool to obtain the high-barrier flexible fabric film material.

10. The preparation method according to claim 9, characterized in that, The temperature for the hot pressing is 120 - 140 °C, the pressure is 0.1 - 0.5 MPa, and the time is 10 - 40 seconds.

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