High-barrier composite film for packaging vacuum insulated panel and preparation method of high-barrier composite film

Abstract

The invention discloses a high-barrier composite film for packaging a vacuum insulated panel, which comprises a high-barrier composite film material, and the high-barrier composite film material is composed of a protective layer, a barrier layer, a solvent bonding layer and a heat sealing layer. The preparation method of the high-barrier composite film for packaging the vacuum insulated panel comprises the following steps: S1, compounding the aluminum-plated surfaces of the first polyester aluminum-plated film and the second polyester aluminum-plated film on a film compounding machine by matching with the second adhesive layer. All layers of materials are combined and bonded together through the solvent bonding layers to form the high-barrier composite membrane material, the high-barrier material is firstly compounded and cured in a mode of step-by-step temperature increasing, and then other layers of materials are compounded, so that the formed high-barrier composite membrane material has better oxygen permeability and moisture permeability detection effects than those of an imported material composite membrane material; and the anti-aging effect is extremely close to that of an imported material composite membrane, so that the cost is reduced, the anti-aging effect is ensured, and the oxygen permeation and moisture permeation effects are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-barrier packaging composite films, and in particular to a high-barrier composite film for vacuum insulation panel packaging and a preparation method thereof. Background Art

[0002] Vacuum insulation panels are panels made using the vacuum insulation principle. They are made by evacuating the air and then heat-sealing it. Therefore, their thermal conductivity is greatly reduced, much lower than the most commonly used insulation materials such as polyurethane rigid foam plastics. They are widely used in home appliances, construction, machinery, electricity, warehousing and other industries. Vacuum insulation panels usually need to be packaged with composite films, which can improve the thermal insulation performance of vacuum insulation panels, prevent damage and facilitate use.

[0003] At present, the requirement for cold chain insulation packaging is vacuum insulation panels with good energy-saving effects. The base materials used for the packaging composite films are all imported materials, which have the risks of long delivery time, high prices and possible supply interruption, and are not cost-effective. In addition, the existing cold chain insulation packaging composite films are insufficient in terms of oxygen and moisture barrier. This paper proposes a high-barrier composite film for vacuum insulation panel packaging and a preparation method to solve the above problems. Summary of the invention

[0004] In view of the deficiencies and defects in the prior art, the present invention proposes a high-barrier composite film for vacuum insulation panel packaging and a preparation method, which are used to solve the technical problems that the current cold chain insulation packaging requirement in the background technology is a vacuum insulation panel with good energy-saving effect, and the base materials used for the packaging composite film are all imported materials, which have the risks of long delivery time, high price and possible supply interruption, and low cost performance. In addition, the existing cold chain insulation packaging composite film has insufficient technical problems in terms of oxygen and moisture barrier.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A high-barrier composite film for vacuum insulation panel packaging comprises a high-barrier composite film material, wherein the high-barrier composite film material is composed of a protective layer, a barrier layer, a solvent bonding layer and a heat-sealing layer, wherein the protective layer is a biaxially oriented nylon film, the barrier layer is composed of a first polyester aluminized film and a second polyester aluminized film, the solvent bonding layer is composed of a first adhesive layer, a second adhesive layer and a third adhesive layer, and the heat-sealing layer is a polyethylene film.

[0006] Preferably, the protective layer is the innermost layer of the high-barrier composite film material, the first adhesive layer is used for composite bonding between the protective layer and the first polyester aluminized film, the second adhesive layer is used for composite bonding between the first polyester aluminized film and the second polyester aluminized film, and the third adhesive layer is used for composite bonding between the second polyester aluminized film and the heat sealing layer.

[0007] Preferably, the first polyester aluminized film and the second polyester aluminized film are obtained by coating a high-adhesion coating on a biaxially oriented polyester film material, then coating a high-barrier coating, and then aging and then vapor-depositing an aluminum layer.

[0008] Preferably, the first adhesive layer, the second adhesive layer and the third adhesive layer are all made of a main agent, a curing agent and ethyl ester according to a certain ratio.

[0009] A method for preparing a high-barrier composite film for vacuum insulation panel packaging comprises the following steps: S1: First, the aluminum-plated surface of the first polyester aluminum-plated film and the aluminum-plated surface of the second polyester aluminum-plated film are compounded with the second adhesive layer on a film compounding machine, and then the composite film of the first polyester aluminum-plated film and the second polyester aluminum-plated film is subjected to the first stage of curing in a curing room: the curing time is 24 hours, and the curing temperature is 40-43°C; the second stage of curing: the curing time is 48 hours, and the curing temperature is 43-45°C; the third stage of curing: the curing time is 24 hours, and the curing temperature is 45-50°C; S2: After the first polyester aluminized film and the second polyester aluminized film composite film are matured, the biaxially oriented nylon film of the protective layer is composited with the composite film of the first polyester aluminized film and the second polyester aluminized film. After the composite is completed, the polyethylene film of the heat-sealing layer is composited with the composite film of the first polyester aluminized film and the second polyester aluminized film to obtain a high-barrier composite film material. Four-section composite drying tunnels are arranged between the multiple film composite machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65±1°C, and 78±1°C. The hot drying temperature is controlled at 50±1°C. The temperature of the cooling roller on the film composite machine is 23±1°C. S3: baking the high barrier composite film material after composite heat baking, the baking time is 25-35 minutes, and the baking temperature is: 100-200°C, until no obvious bubbles appear on the surface of the matured composite film; S4: placing the high barrier composite film material in a curing room for curing treatment, the curing time is 48 hours, the curing temperature is 47-50°C, and the peel strength is tested after the curing is completed. Then the cured high barrier composite film material is placed in a composite drying tunnel for baking treatment, the baking time is 25-35 minutes, and the baking temperature is: 100-200°C, until no obvious bubbles appear on the surface of the cured composite film, and then the slitting treatment is carried out; S5: Mark the roll number, production batch number, material structure specification, production date and product code of the composite film roll after slitting and winding, and send it to the curing room for curing. Fill in the corresponding information in the curing time record sheet to ensure the consistency of the curing time of each roll of the composite semi-finished product.

[0010] Preferably, the composite speed of the first polyester aluminized film and the second polyester aluminized film is 50-60±1 m / min.

[0011] Preferably, the ratio of the solvent bonding layer is main agent LA2788: curing agent LA5000: ethyl ester = 8.33±0.01 g / ㎡: 1.19±0.01 g / ㎡: 10.4±0.01 g / ㎡.

[0012] Preferably, the working concentration of the glue of the solvent bonding layer is 33%, and the viscosity of the glue is measured every 25 minutes to ensure the consistency of the operating viscosity. When the humidity in the workshop is higher than 75%, 0.1-0.2g / ㎡ of curing agent is added, and the amount of glue is measured by sampling every 100mm.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By coating the BOPET film with a high-adhesion coating, and then coating it with a high-barrier coating, and then aging it, an aluminum layer is evaporated to improve the oxygen and moisture barrier properties of the film after the aluminum coating process. The various layers of materials are combined and bonded together using an aging-resistant solvent adhesive layer to form a high-barrier composite film, namely BOPA / ultra-high barrier VMPET / ultra-high barrier VMPET / PE. The high-barrier material is first compounded and aged in a step-by-step manner, and then compounded with other layers of materials. The oxygen and moisture permeability test results of the high-barrier composite film are better than those of the imported material composite film, and the anti-aging effect is extremely close to that of the imported material composite film. While reducing costs and ensuring anti-aging effects, the oxygen and moisture permeability effects are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a high-barrier composite film for vacuum insulation panel packaging proposed by the present invention; Figure 2 This is a schematic diagram of the layered structure of a high-barrier composite film for vacuum insulation panel packaging proposed by the present invention.

[0015] In the figure: 1 high barrier composite film material, 2 protective layer, 3 heat sealing layer, 4 first polyester aluminized film, 5 second polyester aluminized film, 6 first adhesive layer, 7 second adhesive layer, 8 third adhesive layer. DETAILED DESCRIPTION

[0016] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0018] Reference Figure 1-2 As shown, a high-barrier composite film for vacuum insulation panel packaging includes a high-barrier composite film material 1, which is composed of a protective layer 2, a barrier layer, a solvent bonding layer and a heat-sealing layer 3. The protective layer 2 is a biaxially oriented nylon film, which is referred to as BOPA for short, and is made of polyamide (PA) through a biaxial stretching process. The barrier layer is composed of a first polyester aluminum-plated film 4 and a second polyester aluminum-plated film 5, and the polyester aluminum-plated film is an ultra-high barrier VMPET film. The solvent bonding layer is composed of a first adhesive layer 6, a second adhesive layer 7 and a third adhesive layer 8. The heat-sealing layer 3 is a polyethylene film, which is a PE film, and is a film material made of a crystalline thermoplastic resin such as polyethylene through extrusion, blow molding, stretching and other process steps. The high-barrier composite film material 1 composed of the protective layer 2, the barrier layer, the solvent bonding layer and the heat-sealing layer 3 is a BOPA / ultra-high barrier VMPET / ultra-high barrier VMPET / PE structure.

[0019] The protective layer 2 is the innermost layer of the high-barrier composite film material 1, the first adhesive layer 6 is used for composite bonding between the protective layer 2 and the first polyester aluminum-coated film 4, the second adhesive layer 7 is used for composite bonding between the first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5, and the third adhesive layer 8 is used for composite bonding between the second polyester aluminum-coated film 5 and the heat-sealing layer 3. The first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5 are obtained by coating a high-adhesion coating on a biaxially stretched polyester film material, then coating a high-barrier coating, and then aging and then vapor-depositing an aluminum layer. The first adhesive layer 6, the second adhesive layer 7 and the third adhesive layer 8 are all made of a main agent, a curing agent and ethyl ester according to a certain ratio.

[0020] A method for preparing a high-barrier composite film for vacuum insulation panel packaging comprises the following steps: S1: First, the aluminum-plated surface of the first polyester aluminum-plated film 4 and the aluminum-plated surface of the second polyester aluminum-plated film 5 are compounded with the second adhesive layer 7 on a film compounding machine, and then the composite film of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is subjected to the first stage of curing in a curing room: the curing time is 24 hours, and the curing temperature is 40°C; the second stage of curing: the curing time is 48 hours, and the curing temperature is 43°C; the third stage of curing: the curing time is 24 hours, and the curing temperature is 45°C; S2: After the first polyester aluminum film 4 and the second polyester aluminum film 5 are cured, the biaxially oriented nylon film of the protective layer 2 is compounded with the composite film of the first polyester aluminum film 4 and the second polyester aluminum film 5. After the compounding is completed, the polyethylene film of the heat-sealing layer 3 is compounded with the composite film of the first polyester aluminum film 4 and the second polyester aluminum film 5 to obtain a high-barrier composite film material 1. Four-section composite drying tunnels are arranged between the multiple film laminating machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65±1°C, and 78±1°C. The hot drying temperature is controlled at 50±1°C. The temperature of the cooling roller on the film laminating machine is 23±1°C. S3: baking the high barrier composite film material 1 after composite heat baking, the baking time is 25 minutes, and the baking temperature is: 100° C., until no obvious bubbles appear on the surface of the matured composite film; S4: placing the high barrier composite film material 1 in a curing room for curing treatment, the curing time is 48 hours, the curing temperature is 47°C, and the peel strength is tested after the curing is completed. Then, the cured high barrier composite film material 1 is placed in a composite drying tunnel for baking treatment, the baking time is 25 minutes, and the baking temperature is: 100°C, until no obvious bubbles appear on the surface of the cured composite film, and then the slitting process is performed; S5: Mark the roll number, production batch number, material structure specification, production date and product code of the composite film roll after slitting and winding, and send it to the curing room for curing. Fill in the corresponding information in the curing time record sheet to ensure the consistency of the curing time of each roll of the composite semi-finished product.

[0021] The composite speed of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is 50±1m / min, and the ratio of the solvent bonding layer is main agent LA2788: curing agent LA5000: ethyl ester = 8.33±0.01g / ㎡: 1.19±0.01g / ㎡: 10.4±0.01g / ㎡. The working concentration of the glue of the solvent bonding layer is 33%, and the viscosity of the glue is measured every 25min to ensure the consistency of the working viscosity. When the humidity in the workshop is higher than 75%, add 0.1g / ㎡ of curing agent, and take samples every 100mm to measure the amount of glue. When the indoor temperature is lower than 20 degrees, the temperature of the aging room needs to be controlled to rise by 1-2℃. Example

[0022] Reference Figure 1-2As shown, a high-barrier composite film for vacuum insulation panel packaging includes a high-barrier composite film material 1, which is composed of a protective layer 2, a barrier layer, a solvent bonding layer and a heat-sealing layer 3. The protective layer 2 is a biaxially oriented nylon film, which is referred to as BOPA for short, and is made of polyamide (PA) through a biaxial stretching process. The barrier layer is composed of a first polyester aluminum-plated film 4 and a second polyester aluminum-plated film 5, and the polyester aluminum-plated film is an ultra-high barrier VMPET film. The solvent bonding layer is composed of a first adhesive layer 6, a second adhesive layer 7 and a third adhesive layer 8. The heat-sealing layer 3 is a polyethylene film, which is a PE film, and is a film material made of a crystalline thermoplastic resin such as polyethylene through extrusion, blow molding, stretching and other process steps. The high-barrier composite film material 1 composed of the protective layer 2, the barrier layer, the solvent bonding layer and the heat-sealing layer 3 is a BOPA / ultra-high barrier VMPET / ultra-high barrier VMPET / PE structure.

[0023] The protective layer 2 is the innermost layer of the high-barrier composite film material 1, the first adhesive layer 6 is used for composite bonding between the protective layer 2 and the first polyester aluminum-coated film 4, the second adhesive layer 7 is used for composite bonding between the first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5, and the third adhesive layer 8 is used for composite bonding between the second polyester aluminum-coated film 5 and the heat-sealing layer 3. The first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5 are obtained by coating a high-adhesion coating on a biaxially stretched polyester film material, then coating a high-barrier coating, and then aging and then vapor-depositing an aluminum layer. The first adhesive layer 6, the second adhesive layer 7 and the third adhesive layer 8 are all made of a main agent, a curing agent and ethyl ester according to a certain ratio.

[0024] A method for preparing a high-barrier composite film for vacuum insulation panel packaging comprises the following steps: S1: First, the aluminum-plated surface of the first polyester aluminum-plated film 4 and the aluminum-plated surface of the second polyester aluminum-plated film 5 are compounded with the second adhesive layer 7 on a film compounding machine, and then the composite film of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is subjected to the first stage of curing in a curing room: the curing time is 24 hours, and the curing temperature is 42°C; the second stage of curing: the curing time is 48 hours, and the curing temperature is 44°C; the third stage of curing: the curing time is 24 hours, and the curing temperature is 47°C; S2: After the first polyester aluminum film 4 and the second polyester aluminum film 5 are cured, the biaxially oriented nylon film of the protective layer 2 is compounded with the composite film of the first polyester aluminum film 4 and the second polyester aluminum film 5. After the compounding is completed, the polyethylene film of the heat-sealing layer 3 is compounded with the composite film of the first polyester aluminum film 4 and the second polyester aluminum film 5 to obtain a high-barrier composite film material 1. Four-section composite drying tunnels are arranged between the multiple film laminating machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65±1°C, and 78±1°C. The hot drying temperature is controlled at 50±1°C. The temperature of the cooling roller on the film laminating machine is 23±1°C. S3: baking the high barrier composite film material 1 after composite heat baking, the baking time is 30 minutes, and the baking temperature is: 150° C., until no obvious bubbles appear on the surface of the matured composite film; S4: placing the high barrier composite film material 1 in a curing room for curing treatment, the curing time is 48 hours, the curing temperature is 48°C, the peel strength is tested after the curing is completed, and then the cured high barrier composite film material 1 is placed in a composite drying tunnel for baking treatment, the baking time is 30 minutes, and the baking temperature is: 150°C, until no obvious bubbles appear on the surface of the cured composite film, and then the slitting process is performed; S5: Mark the roll number, production batch number, material structure specification, production date and product code of the composite film roll after slitting and winding, and send it to the curing room for curing. Fill in the corresponding information in the curing time record sheet to ensure the consistency of the curing time of each roll of the composite semi-finished product.

[0025] The composite speed of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is 55±1m / min, and the ratio of the solvent bonding layer is main agent LA2788: curing agent LA5000: ethyl ester = 8.33±0.01g / ㎡: 1.19±0.01g / ㎡: 10.4±0.01g / ㎡. The working concentration of the glue of the solvent bonding layer is 33%, and the viscosity of the glue is measured every 25min to ensure the consistency of the working viscosity. When the humidity in the workshop is higher than 75%, add 0.15g / ㎡ of curing agent, and take samples every 100mm to measure the amount of glue. When the indoor temperature is lower than 20 degrees, the temperature of the aging room needs to be controlled to rise by 1-2℃. Example

[0026] Reference Figure 1-2As shown, a high-barrier composite film for vacuum insulation panel packaging includes a high-barrier composite film material 1, which is composed of a protective layer 2, a barrier layer, a solvent bonding layer and a heat-sealing layer 3. The protective layer 2 is a biaxially oriented nylon film, which is referred to as BOPA for short, and is made of polyamide (PA) through a biaxial stretching process. The barrier layer is composed of a first polyester aluminum-plated film 4 and a second polyester aluminum-plated film 5, and the polyester aluminum-plated film is an ultra-high barrier VMPET film. The solvent bonding layer is composed of a first adhesive layer 6, a second adhesive layer 7 and a third adhesive layer 8. The heat-sealing layer 3 is a polyethylene film, which is a PE film, and is a film material made of a crystalline thermoplastic resin such as polyethylene through extrusion, blow molding, stretching and other process steps. The high-barrier composite film material 1 composed of the protective layer 2, the barrier layer, the solvent bonding layer and the heat-sealing layer 3 is a BOPA / ultra-high barrier VMPET / ultra-high barrier VMPET / PE structure.

[0027] The protective layer 2 is the innermost layer of the high-barrier composite film material 1, the first adhesive layer 6 is used for composite bonding between the protective layer 2 and the first polyester aluminum-coated film 4, the second adhesive layer 7 is used for composite bonding between the first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5, and the third adhesive layer 8 is used for composite bonding between the second polyester aluminum-coated film 5 and the heat-sealing layer 3. The first polyester aluminum-coated film 4 and the second polyester aluminum-coated film 5 are obtained by coating a high-adhesion coating on a biaxially stretched polyester film material, then coating a high-barrier coating, and then aging and then vapor-depositing an aluminum layer. The first adhesive layer 6, the second adhesive layer 7 and the third adhesive layer 8 are all made of a main agent, a curing agent and ethyl ester according to a certain ratio.

[0028] A method for preparing a high-barrier composite film for vacuum insulation panel packaging comprises the following steps: S1: First, the aluminum-plated surface of the first polyester aluminum-plated film 4 and the aluminum-plated surface of the second polyester aluminum-plated film 5 are compounded with the second adhesive layer 7 on a film compounding machine, and then the composite film of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is subjected to the first stage of curing in a curing room: the curing time is 24 hours, and the curing temperature is 43°C; the second stage of curing: the curing time is 48 hours, and the curing temperature is 45°C; the third stage of curing: the curing time is 24 hours, and the curing temperature is 50°C; S2: After the first polyester aluminized film 4 and the second polyester aluminized film 5 are cured, the biaxially oriented nylon film of the protective layer 2 is compounded with the composite film of the first polyester aluminized film 4 and the second polyester aluminized film 5. After the compounding is completed, the polyethylene film of the heat-sealing layer 3 is compounded with the composite film of the first polyester aluminized film 4 and the second polyester aluminized film 5 to obtain a high-barrier composite film material 1. Four-section composite drying tunnels are arranged between the multiple film laminating machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65±1°C, and 78±1°C. The hot drying temperature is controlled at 50±1°C. The temperature of the cooling roller on the film laminating machine is 23±1°C. S3: baking the high barrier composite film material 1 after composite heat baking, the baking time is 35 minutes, and the baking temperature is: 200° C., until no obvious bubbles appear on the surface of the matured composite film; S4: placing the high barrier composite film material 1 in a curing room for curing treatment, the curing time is 48 hours, the curing temperature is 50°C, and the peel strength is tested after the curing is completed. Then, the cured high barrier composite film material 1 is placed in a composite drying tunnel for baking treatment, the baking time is 35 minutes, and the baking temperature is: 200°C, until no obvious bubbles appear on the surface of the cured composite film, and then the slitting process is performed; S5: Mark the roll number, production batch number, material structure specification, production date and product code of the composite film roll after slitting and winding, and send it to the curing room for curing. Fill in the corresponding information in the curing time record sheet to ensure the consistency of the curing time of each roll of the composite semi-finished product.

[0029] The composite speed of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is 60±1m / min, and the ratio of the solvent bonding layer is main agent LA2788: curing agent LA5000: ethyl ester = 8.33±0.01g / ㎡: 1.19±0.01g / ㎡: 10.4±0.01g / ㎡. The working concentration of the glue of the solvent bonding layer is 33%, and the viscosity of the glue is measured every 25min to ensure the consistency of the working viscosity. When the humidity in the workshop is higher than 75%, add 0.2g / ㎡ of curing agent, and take samples every 100mm to measure the amount of glue. When the indoor temperature is lower than 20 degrees, the temperature of the aging room needs to be controlled to rise by 1-2℃.

[0030] In summary, Embodiment 2 is the best embodiment and is superior to other embodiments in terms of efficiency, cost-effectiveness and practicality.

[0031] The test results of high barrier composite film are as follows:

[0032] In the present invention, the aluminum-plated surface of the first polyester aluminum-plated film 4 and the aluminum-plated surface of the second polyester aluminum-plated film 5 are firstly compounded with the second adhesive layer 7 on a film compounding machine, and then the composite film of the first polyester aluminum-plated film 4 and the second polyester aluminum-plated film 5 is subjected to the first stage of curing in a curing room: the curing time is 24 hours, and the curing temperature is 40-43°C; the second stage of curing: the curing time is 48 hours, and the curing temperature is 43-45°C; the third stage of curing: the curing time is 24 hours, and the curing temperature is 45-50°C; and the third stage of curing: the curing time is 24 hours, and the curing temperature is 45-50°C; and the third stage of curing: the curing time is 24 hours, and the curing temperature is 45-50°C. After the composite film of the first polyester aluminized film 4 and the second polyester aluminized film 5 is matured, the biaxially oriented nylon film of the protective layer 2 is composited with the composite film of the first polyester aluminized film 4 and the second polyester aluminized film 5. After the composite is completed, the polyethylene film of the heat-sealing layer 3 is composited with the composite film of the first polyester aluminized film 4 and the second polyester aluminized film 5 to obtain a high-barrier composite film material 1. Four-section composite drying tunnels are arranged between the multiple film composite machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65± 1℃, 78±1℃, the hot baking temperature is controlled at 50±1℃, and the temperature of the cooling roller on the film laminating machine is 23±1℃; the high barrier composite film material 1 after composite hot baking is baked, the baking time is 25-35min, the baking temperature is: 100-200℃, until no obvious bubbles appear on the surface of the matured composite film; the high barrier composite film material 1 is placed in the aging room for aging treatment, the aging time is 48h, the aging temperature is 47-50℃, the peel strength is tested after aging, and then the aging is completed. The final high-barrier composite film material 1 is placed in a composite drying tunnel for baking treatment. The baking time is 25-35 minutes and the baking temperature is 100-200°C. It is cut until no obvious bubbles appear on the surface of the matured composite film. The composite film winding roll after slitting and winding is marked with the roll number, production batch number, material structure specification, production date and product code, and sent to the curing room for curing. The corresponding information is filled in the curing time record sheet to ensure the consistency of the curing time of each roll of the complete composite semi-finished product.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-barrier composite film for vacuum insulation panel packaging, comprising a high-barrier composite film material (1), characterized in that: The high-barrier composite film material (1) is composed of a protective layer (2), a barrier layer, a solvent bonding layer and a heat-sealing layer (3); the protective layer (2) is a biaxially oriented nylon film; the barrier layer is composed of a first polyester aluminum-plated film (4) and a second polyester aluminum-plated film (5); the solvent bonding layer is composed of a first adhesive layer (6), a second adhesive layer (7) and a third adhesive layer (8); and the heat-sealing layer (3) is a polyethylene film.

2. The high barrier composite film for vacuum insulation panel packaging according to claim 1, characterized in that: The protective layer (2) is the innermost layer of the high-barrier composite film material (1); the first adhesive layer (6) is used for composite bonding between the protective layer (2) and the first polyester aluminized film (4); the second adhesive layer (7) is used for composite bonding between the first polyester aluminized film (4) and the second polyester aluminized film (5); and the third adhesive layer (8) is used for composite bonding between the second polyester aluminized film (5) and the heat-sealing layer (3).

3. The high barrier composite film for vacuum insulation panel packaging according to claim 1, characterized in that: The first polyester aluminized film (4) and the second polyester aluminized film (5) are obtained by coating a high-adhesion coating on a biaxially oriented polyester film material, then coating a high-barrier coating, and then aging and then vapor-depositing an aluminum layer.

4. The high barrier composite film for vacuum insulation panel packaging according to claim 1, characterized in that: The first adhesive layer (6), the second adhesive layer (7) and the third adhesive layer (8) are all made of a main chemical agent, a curing agent and ethyl ester according to a certain ratio.

5. A method for preparing a high barrier composite film for vacuum insulation panel packaging using any one of claims 1 to 4, characterized in that: The following steps are involved: S1: First, the aluminum-plated surfaces of the first polyester aluminum-plated film (4) and the aluminum-plated surfaces of the second polyester aluminum-plated film (5) are laminated together with a second adhesive layer (7) on a film laminating machine, and then the composite film of the first polyester aluminum-plated film (4) and the second polyester aluminum-plated film (5) is subjected to a first stage of aging in a aging room: the aging time is 24 hours and the aging temperature is 40-43°C; the second stage of aging: the aging time is 48 hours and the aging temperature is 43-45°C; the third stage of aging: the aging time is 24 hours and the aging temperature is 45-50°C; S2: After the first polyester aluminum film (4) and the second polyester aluminum film (5) are matured, the biaxially oriented nylon film of the protective layer (2) is compounded with the composite film of the first polyester aluminum film (4) and the second polyester aluminum film (5). After the compounding is completed, the polyethylene film of the heat-sealing layer (3) is compounded with the composite film of the first polyester aluminum film (4) and the second polyester aluminum film (5) to obtain a high-barrier composite film material (1). Four-section composite drying tunnels are arranged between the multiple film laminating machines. The temperatures of the four-section composite drying tunnels are respectively controlled at 45±1°C, 55±1°C, 65±1°C, and 78±1°C. The hot drying temperature is controlled at 50±1°C. The temperature of the cooling roller on the film laminating machine is 23±1°C. S3: baking the high barrier composite film material (1) after composite heat baking, the baking time is 25-35 minutes, and the baking temperature is: 100-200° C., until no obvious bubbles appear on the surface of the cured composite film; S4: placing the high barrier composite film material (1) in a curing room for curing treatment, the curing time is 48 hours, the curing temperature is 47-50°C, and after the curing is completed, the peel strength is tested. Then, the cured high barrier composite film material (1) is placed in a composite drying tunnel for baking treatment, the baking time is 25-35 minutes, and the baking temperature is: 100-200°C, until no obvious bubbles appear on the surface of the cured composite film, and then slitting is carried out; S5: Mark the roll number, production batch number, material structure specification, production date and product code of the composite film roll after slitting and winding, and send it to the curing room for curing. Fill in the corresponding information in the curing time record sheet to ensure the consistency of the curing time of each roll of the composite semi-finished product.

6. The method for preparing a high barrier composite film for vacuum insulation panel packaging according to claim 4, characterized in that: The composite speed of the first polyester aluminized film (4) and the second polyester aluminized film (5) is 50-60±1 m / min.

7. The method for preparing a high barrier composite film for vacuum insulation panel packaging according to claim 4, characterized in that: The ratio of the solvent bonding layer is as follows: main agent LA2788: curing agent LA5000: ethyl ester = 8.33±0.01g / ㎡: 1.19±0.01g / ㎡: 10.4±0.01g / ㎡.

8. The method for preparing a high-barrier composite film for vacuum insulation panel packaging according to claim 4, characterized in that: The working concentration of the glue of the solvent bonding layer is 33%, and the viscosity of the glue is measured every 25 minutes to ensure the consistency of the operating viscosity. When the humidity in the workshop is higher than 75%, 0.1-0.2g / ㎡ of curing agent is added, and the amount of glue is measured by sampling every 100mm.

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