Enhanced aluminized base film and preparation method thereof

Abstract

The invention belongs to the technical field of base film products, and provides an enhanced aluminum-plated base film and a preparation method thereof. The enhanced aluminum-plated base film comprises a base film layer and an aluminum-plated barrier layer, the enhanced reaction layer is arranged between the base film layer and the aluminized barrier layer; the enhanced reaction layer comprises the following components in parts by weight: 47-80 parts of PET resin, 10-25 parts of polypropylene resin, 1-8 parts of an anodic aluminum oxide adhesion promoter, 3-10 parts of polyaluminum ferric chloride, 1-5 parts of an organosilicon modified polyurethane coating, 1-5 parts of a water-borne epoxy resin coating, 1-10 parts of phosphate, 0.5-1 part of a stabilizer, 1-3 parts of a coating auxiliary agent, 1-3 parts of a defoaming agent and 0.5-0.8 part of an antioxidant; wherein the weight ratio of the organic silicon modified polyurethane coating to the water-borne epoxy resin coating is (0.8-2.8): 1.2. Compared with the prior art, the obtained aluminum-based film has the advantages that the adhesive force of an aluminized barrier layer can be greatly improved, the barrier property is excellent, oxygen permeation data meets the requirements of packaging products, and popularization and application are expanded.

Description

Technical Field

[0001] The invention belongs to the technical field of base film products, and in particular relates to an enhanced aluminum-plated base film and a preparation method thereof. Background Art

[0002] Aluminum-coated film is a composite flexible packaging material formed by coating an extremely thin layer of metal aluminum on the surface of a plastic film using a special process. The most commonly used processing method is vacuum aluminizing, which is to melt and evaporate metal aluminum at high temperature under a high vacuum state, so that the aluminum vapor precipitates and accumulates on the surface of the plastic film, thereby giving the surface of the plastic film a metallic luster. Since it has the properties of both plastic film and metal, it is a cheap, beautiful, high-performance and highly practical packaging material.

[0003] In the related prior art, a utility model patent authorized by China discloses a name of an aluminum-plated barrier layer reinforced film, the publication number is CN205890054U, and the specific technical solution disclosed in the patent is: "An aluminum-plated barrier layer reinforced film, including a PET base film layer, an aluminum-plated barrier layer and a first adhesive layer, the first adhesive layer is fixedly bonded to the lower surface of the PET base film layer, the aluminum-plated barrier layer is located above the PET base film layer, and a reinforcing layer and a second adhesive layer are arranged between the aluminum-plated barrier layer and the upper surface of the PET base film layer, the reinforcing layer is bonded and fixed to the upper surface of the PET base film layer through the second adhesive layer, and a plurality of main reinforcing layers are integrally arranged on the upper surface of the reinforcing layer. A side reinforcing rib is integrally arranged on the left and right sides of each main reinforcing rib, and the lower surface of the aluminized barrier layer is fixedly connected to the upper surface of the reinforcing layer, and the main reinforcing ribs and the side reinforcing ribs are both located in the aluminized barrier layer, a plurality of reinforcing strips are transversely arranged in the aluminized barrier layer, and a transparent protective layer is fixedly arranged on the upper surface of the aluminized barrier layer. The aforementioned existing reinforced film is provided with a reinforcing layer, although it has the effect of making the aluminized barrier layer reliably connected, having good strength and not being easily broken after encountering a collision to a certain extent, it is limited by the limitation of the structure, resulting in poor barrier properties in actual use, and the oxygen permeability data cannot meet the requirements of packaging products, and its promotion and application are limited. Summary of the invention

[0004] In view of the above problems existing in the prior art, the object of the present invention is to provide an enhanced aluminum-plated base film and a preparation method thereof, which has the advantages of greatly improving the adhesion of the aluminum-plated barrier layer and excellent barrier properties.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An enhanced aluminum-plated base film comprises a base film layer, an aluminum-plated barrier layer; and an enhanced reaction layer disposed between the base film layer and the aluminum-plated barrier layer; the enhanced reaction layer comprises the following parts by weight:

[0007] 47-80 parts of PET resin, 10-25 parts of polypropylene resin, 1-8 parts of anodized aluminum adhesion promoter, 3-10 parts of polyaluminum ferric chloride, 1-5 parts of organosilicon modified polyurethane coating, 1-5 parts of waterborne epoxy resin coating, 1-10 parts of phosphate, 0.5-1 parts of stabilizer, 1-3 parts of coating auxiliary agent, 1-3 parts of defoaming agent, and 0.5-0.8 parts of antioxidant; wherein the weight ratio of the organosilicon modified polyurethane coating to the waterborne epoxy resin coating is (0.8-2.8):1.2.

[0008] As a preferred technical solution of the present invention, the enhanced reaction layer comprises the following parts by weight:

[0009] 52 parts of PET resin, 20 parts of polypropylene resin, 6 parts of anodized aluminum adhesion promoter, 3 parts of polyaluminum ferric chloride, 4 parts of silicone modified polyurethane coating, 2 parts of water-based epoxy resin coating, 8 parts of phosphate, 1 part of stabilizer, 1.4 parts of coating auxiliary agent, 2 parts of defoaming agent, and 0.6 parts of antioxidant.

[0010] As a preferred technical solution of the present invention, the weight ratio of the silicone-modified polyurethane coating to the water-based epoxy resin coating is 2.3:1.2.

[0011] As a preferred technical solution of the present invention, the coating auxiliary agent includes a chemical polishing additive.

[0012] As a preferred technical solution of the present invention, the base film layer is made of heat-resistant modified high-density polyethylene obtained by cross-linking reaction of high-density polyethylene, polyamide and acid ester silicone oil.

[0013] The present invention also provides a method for preparing the enhanced aluminum-plated base film as described above, the method comprising the following steps:

[0014] S1 cleaning: cleaning the surface of the base film layer with a cleaning agent and a degreasing agent;

[0015] S2: Winding and vacuuming: The base film layer treated in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating equipment is started to heat the processing chamber to raise its temperature to 1200-1500°C;

[0016] S3 evaporation to form an aluminum film: the raw materials as proportioned in the above claims, aluminum wire with a purity of 99.9% and oxygen are introduced above the evaporation zone of the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is arranged in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer; wherein the oxygen introduction amount is 6.2-8L / min, and the evaporation rate of aluminum is 1-8.5g / min; the power of the microwave plasma system is 1.5-5kW, and the microwave operating frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer to form an aluminum-plated barrier layer, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained.

[0017] As a preferred technical solution of the present invention, the temperature range of the cooling process in step S3 is 20-45°C.

[0018] The invention relates to an enhanced aluminum-plated base film and a preparation method thereof, which have the following beneficial effects: the enhanced aluminum-plated base film contains anodized aluminum adhesion and polyaluminum ferric chloride, and can change the internal structure of the enhanced reaction layer through the anodized aluminum adhesion and polyaluminum ferric chloride in the aluminum plating process, greatly improving the adhesion and barrier properties of aluminum ions, making aluminum ions more firmly plated on the surface of the base film layer, and blocking the intake of impurities; and the combination of organic silicon modified polyurethane coating and water-based epoxy resin coating can form an enhanced reaction layer with high cross-linking density on the film by utilizing its functional groups, so that it has high wear resistance and flame resistance; and the addition of phosphate can gradually penetrate the internal structure of the film, and can change the corrosion resistance of the aluminum-based film by utilizing its corrosion resistance; therefore, the aluminum-based film obtained by the invention has the advantages of greatly improving the adhesion of the aluminum-plated barrier layer and excellent barrier properties, and the oxygen permeability data meets the requirements of packaging products, thereby expanding the promotion and application.

[0019] The present invention will be further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the enhanced aluminum-plated base film applied for the present invention;

[0021] Figure 2 This is the actual product picture of the enhanced aluminum-plated base film applied for by the present invention.

[0022] Reference numerals - In the drawings:

[0023] 1-base film layer; 2-aluminum-plated barrier layer; 3-enhanced reaction layer. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0026] Example 1

[0027] An enhanced aluminum-plated base film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer 1, an aluminum-plated barrier layer 2; and also includes an enhanced reaction layer 3 arranged between the base film layer 1 and the aluminum-plated barrier layer 2; the enhanced reaction layer 3 includes the following parts by weight:

[0028] 73 parts of PET resin, 10 parts of polypropylene resin, 1 part of anodized aluminum adhesion promoter, 3 parts of polyaluminum ferric chloride, 1 part of organosilicon modified polyurethane coating, 1 part of waterborne epoxy resin coating, 8 parts of phosphate, 0.5 part of stabilizer, 1 part of coating auxiliary agent, 1 part of defoamer, and 0.5 part of antioxidant; wherein the weight ratio of the organosilicon modified polyurethane coating to the waterborne epoxy resin coating is 0.8:1.2.

[0029] The preparation method of the enhanced aluminum-plated base film comprises the following steps:

[0030] S1 cleaning: cleaning the surface of the base film layer 1 with a cleaning agent and a degreasing agent;

[0031] S2: Winding and vacuuming: The base film layer 1 treated in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating device is started to heat the processing chamber to raise its temperature to 1200°C;

[0032] S3 evaporation to form aluminum film: the raw materials as described in the above claims, aluminum wire with a purity of 99.9% and oxygen are introduced into the evaporation zone of the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is provided in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer 3; wherein the oxygen introduction amount is 6.5L / min, and the evaporation rate of aluminum is 3.5g / min; the power of the microwave plasma system is 1.5kW, and the microwave operating frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer 3 to form an aluminum-plated barrier layer 2, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained. The above-mentioned coating auxiliary agent includes a chemical polishing additive, and the temperature range of the cooling process in step S3 is 25°C.

[0033] Example 2

[0034] An enhanced aluminum-plated base film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer 1, an aluminum-plated barrier layer 2; and also includes an enhanced reaction layer 3 arranged between the base film layer and the aluminum-plated barrier layer; the enhanced reaction layer includes the following parts by weight:

[0035] 57 parts of PET resin, 15 parts of polypropylene resin, 5 parts of anodized aluminum adhesion promoter, 7 parts of polyaluminum ferric chloride, 3 parts of organosilicon-modified polyurethane coating, 3 parts of waterborne epoxy resin coating, 4 parts of phosphate, 0.8 parts of stabilizer, 2.7 parts of coating auxiliary agent, 2 parts of defoamer, and 0.5 parts of antioxidant; wherein the weight ratio of the organosilicon-modified polyurethane coating to the waterborne epoxy resin coating is 1.2:1.2.

[0036] The preparation method of the enhanced aluminum-plated base film comprises the following steps:

[0037] S1 cleaning: cleaning the surface of the base film layer with a cleaning agent and a degreasing agent;

[0038] S2: Winding and vacuuming: The base film layer treated in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating equipment is started to heat the processing chamber to raise its temperature to 1400°C;

[0039] S3 evaporation to form aluminum film: the raw materials as described in the above claims, aluminum wire with a purity of 99.9% and oxygen are introduced into the evaporation zone above the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is arranged in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer 3; wherein the oxygen introduction amount is 7.5L / min, and the evaporation rate of aluminum is 8g / min; the power of the microwave plasma system is 3.5kW, and the microwave working frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer to form an aluminum-plated barrier layer 2, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained. The above-mentioned coating auxiliary agent includes a chemical polishing additive, and the temperature range of the cooling process in step S3 is 20°C.

[0040] Example 3

[0041] An enhanced aluminum-plated base film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer 1, an aluminum-plated barrier layer 2; and also includes an enhanced reaction layer 3 arranged between the base film layer and the aluminum-plated barrier layer; the enhanced reaction layer includes the following parts by weight:

[0042] 52 parts of PET resin, 20 parts of polypropylene resin, 6 parts of anodized aluminum adhesion promoter, 3 parts of polyaluminum ferric chloride, 4 parts of silicone modified polyurethane coating, 2 parts of waterborne epoxy resin coating, 8 parts of phosphate, 1 part of stabilizer, 1.4 parts of coating auxiliary agent, 2 parts of defoamer, and 0.6 parts of antioxidant; wherein the weight ratio of the silicone modified polyurethane coating to the waterborne epoxy resin coating is 2.3:1.2.

[0043] The preparation method of the enhanced aluminum-plated base film comprises the following steps:

[0044] S1 cleaning: cleaning the surface of the base film layer with a cleaning agent and a degreasing agent;

[0045] S2: Winding and vacuuming: The base film layer treated in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating equipment is started to heat the processing chamber to raise its temperature to 1300°C;

[0046] S3 evaporation to form aluminum film: the raw materials as described in the above claims, aluminum wire with a purity of 99.9% and oxygen are introduced into the evaporation zone of the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is arranged in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer 3; wherein the oxygen introduction amount is 6.5L / min, and the evaporation rate of aluminum is 5g / min; the power of the microwave plasma system is 4.5kW, and the microwave working frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer to form an aluminum-plated barrier layer 2, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained. The above-mentioned coating auxiliary agent includes a chemical polishing additive, and the temperature range of the cooling process in step S3 is 35°C.

[0047] Example 4

[0048] An enhanced aluminum-plated base film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer 1, an aluminum-plated barrier layer 2; and also includes an enhanced reaction layer arranged between the base film layer 1 and the aluminum-plated barrier layer 2; the enhanced reaction layer 3 includes the following parts by weight:

[0049] 47 parts of PET resin, 25 parts of polypropylene resin, 8 parts of anodized aluminum adhesion promoter, 10 parts of polyaluminum ferric chloride, 5 parts of silicone modified polyurethane coating, 2 parts of waterborne epoxy resin coating, 10 parts of phosphate, 0.5 parts of stabilizer, 1 part of coating auxiliary agent, 1 part of defoamer, and 0.5 parts of antioxidant; wherein the weight ratio of the silicone modified polyurethane coating to the waterborne epoxy resin coating is 2.8:1.2.

[0050] The preparation method of the enhanced aluminum-plated base film comprises the following steps:

[0051] S1 cleaning: cleaning the surface of the base film layer with a cleaning agent and a degreasing agent;

[0052] S2: Winding and vacuuming: The base film layer after the treatment in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating equipment is started to heat the processing chamber to raise its temperature to 1500°C;

[0053] S3 evaporation to form aluminum film: the raw materials as described in the above claims, aluminum wire with a purity of 99.9% and oxygen are introduced into the evaporation zone of the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is provided in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer 3; wherein the oxygen introduction amount is 8L / min, and the evaporation rate of aluminum is 8.5g / min; the power of the microwave plasma system is 5kW, and the microwave operating frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer to form an aluminum-plated barrier layer 2, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained. The above-mentioned coating auxiliary agent includes a chemical polishing additive, and the temperature range of the cooling process in step S3 is 45°C.

[0054] The modification process of the silicone-modified polyurethane coating in the above-mentioned embodiments 1-3 belongs to the prior art. Please refer to the Chinese invention patent application entitled "A high barrier and cooking-resistant aluminum-plated film and its preparation method", publication number CN118456999A, and no further details will be given here.

[0055] Comparative Example 1

[0056] The difference between the preparation of the above-mentioned aluminum-plated base film and Example 1 is that no anodized aluminum adhesion promoter is added to the raw material ratio during the preparation; other preparation conditions remain the same.

[0057] Comparative Example 2

[0058] The difference between the preparation of the above-mentioned aluminum-plated base film and Example 1 is that no polyaluminum ferric chloride is added to the raw material ratio during the preparation; other preparation conditions remain the same.

[0059] Comparative Example 3

[0060] The difference between the preparation of the above-mentioned aluminum-plated base film and Example 1 is that no silicone-modified polyurethane coating and no water-based epoxy resin coating are added to the raw material ratio during the preparation; other preparation conditions remain the same.

[0061] Comparative Example 4

[0062] The difference between the preparation of the above-mentioned aluminum-plated base film and Example 1 is that no phosphate is added to the raw material ratio during the preparation; other preparation conditions remain the same.

[0063] Reference example

[0064] The difference from Example 1 in the preparation of the above-mentioned aluminum-plated base film is that no anodized aluminum adhesion promoter, polyaluminum ferric chloride, silicone-modified polyurethane coating, water-based epoxy resin coating and phosphate are added to the raw material ratio during the preparation; other preparation conditions remain the same.

[0065] The base film layers in the above-mentioned Examples 1-4, Comparative Examples 1-4 and Reference Examples are all made of heat-resistant modified high-density polyethylene obtained by cross-linking high-density polyethylene, polyamide and acid ester silicone oil.

[0066] Performance test

[0067] (1) Adhesion test of aluminum-coated base film: The test was performed using a BLD-200S aluminum-coated film aluminum-coated barrier layer adhesion tester produced by Mile Instruments. The aluminum-coated base films of Examples 1-4, Comparative Examples 1-4 and Reference Example were taken, and specifically 3 samples with a width of about 100 mm and a length of about 250 mm were cut along the longitudinal direction of the aluminum-coated base film. A transparent BOPP pressure-sensitive adhesive tape with a peel strength of (2.0±0.2) N / cm was respectively adhered to the aluminum-coated surface of the aluminum-coated base film, and then cut into 15 m wide specimens. The tensile peel test was then performed using the BLD-200S aluminum-coated film aluminum-coated barrier layer adhesion tester, wherein the aluminum-coated base film and the pressure-sensitive adhesive tape should be tightly adhered without defects such as bubbles and wrinkles. The tensile strength data of the test was recorded during the test. The results are shown in Table 1 below.

[0068] Test items Tensile strength (N / 15m) Example 1 3.32 Example 2 3.46 Example 3 3.50 Example 4 3.41 Comparative Example 1 1.33 Comparative Example 2 2.10 Comparative Example 3 2.21 Comparative Example 4 2.05 Reference example 0.53

[0069] It can be seen from Table 1 above that the tensile strength of the aluminum-plated base films obtained in Examples 1-4 are all distributed above 3N / 15m, among which the value of Example 3 is 3.50, which is the largest. This example is the aluminum-plated base film with the best adhesion performance. Compared with Comparative Example 1, it can be explained that the enhanced aluminum-plated base film is prepared using anodized aluminum adhesion, which can significantly improve the adhesion performance of the aluminum-plated base film obtained in Examples 1-4.

[0070] (2) Oxygen permeation test: According to GB / T 1038.1-2022 "Test method for gas permeability of plastic films and sheets", the oxygen permeation of the packaging films in each embodiment and comparative example after being steamed at 150° C. for different times (0 min, 15 min, 30 min, 45 min) was tested. The smaller the oxygen permeation (unit: cubic centimeter / m2.24h.0.1Mpa), the better the oxygen barrier performance.

[0071]

[0072] It can be seen from the above table that the probability of delamination of the enhanced aluminum-plated base film embodiments 1-4 of the present invention is very small, and the respective oxygen permeability within the range of 0-15min is no more than 1 cubic centimeter / ㎡.24h.0.1Mpa, among which the oxygen permeability of the enhanced aluminum-plated base film obtained in embodiment 3 is relatively small, and this embodiment 3 is the best example; and the reason why the delamination of embodiment 2 after cooking for 45min may be related to the processing conditions in the preparation process; compared with comparative example 2: no polyaluminum ferric chloride is added during the preparation, and the aluminum-based film is delaminated after cooking for 30min, resulting in a large oxygen permeability; therefore, polyaluminum ferric chloride changes the internal structure of the enhanced reaction layer, so that the enhanced aluminum-plated base film has excellent barrier advantages, and the oxygen permeability data meets the requirements of packaging products, which expands the promotion and application.

[0073] In addition, by combining the silicone-modified polyurethane coating with the water-based epoxy resin coating, the functional groups thereof can form a high cross-linking density reinforcing reaction layer on the film, which can make the enhanced aluminum-plated base film have high wear resistance and flame resistance; the addition of phosphates allows it to gradually penetrate the internal structure of the film, and by utilizing its corrosion resistance, the corrosion resistance of the aluminum-based film can be changed. Specific tests are not provided here; the enhanced aluminum-plated base film applied for by the present invention can be used in a variety of food packaging industries.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An enhanced aluminum-plated base film, comprising a base film layer and an aluminum-plated barrier layer; characterized in that: It also includes an enhanced reaction layer disposed between the base film layer and the aluminum-plated barrier layer; the enhanced reaction layer includes the following parts by weight: 47-80 parts of PET resin, 10-25 parts of polypropylene resin, 1-8 parts of anodized aluminum adhesion promoter, 3-10 parts of polyaluminum ferric chloride, 1-5 parts of organosilicon modified polyurethane coating, 1-5 parts of waterborne epoxy resin coating, 1-10 parts of phosphate, 0.5-1 parts of stabilizer, 1-3 parts of coating auxiliary agent, 1-3 parts of defoaming agent, and 0.5-0.8 parts of antioxidant; wherein the weight ratio of the organosilicon modified polyurethane coating to the waterborne epoxy resin coating is (0.8-2.8):1.

2.

2. The enhanced aluminum-plated base film according to claim 1, characterized in that: The enhanced reaction layer comprises the following parts by weight: 52 parts of PET resin, 20 parts of polypropylene resin, 6 parts of anodized aluminum adhesion promoter, 3 parts of polyaluminum ferric chloride, 4 parts of silicone modified polyurethane coating, 2 parts of water-based epoxy resin coating, 8 parts of phosphate, 1 part of stabilizer, 1.4 parts of coating auxiliary agent, 2 parts of defoaming agent, and 0.6 parts of antioxidant.

3. The enhanced aluminum-plated base film according to claim 1, characterized in that: The weight ratio of the silicone-modified polyurethane coating to the waterborne epoxy resin coating is 2.3:1.

2.

4. The enhanced aluminum-plated base film according to claim 1, characterized in that: The coating auxiliary agent includes a chemical polishing additive.

5. The enhanced aluminum-plated base film according to any one of claims 1 to 4, characterized in that: The base film layer is made of heat-resistant modified high-density polyethylene obtained by cross-linking reaction of high-density polyethylene, polyamide and acid ester silicone oil.

6. A method for preparing an enhanced aluminum-plated base film according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps S1 cleaning: cleaning the surface of the base film layer with a cleaning agent and a degreasing agent; S2: Winding and vacuuming: The base film layer treated in step S1 is wound up by a winder, and then the roll-shaped base film layer is installed in the unwinding station of the vacuum evaporation machine. After the film passes through the cooling roller, the processing chamber is vacuumed by a vacuum pump, and the vacuum degree of the processing chamber is greater than or equal to 4x10-4mba, and the heating equipment is started to heat the processing chamber to raise its temperature to 1200-1500°C; S3 evaporation to form an aluminum film: the raw materials in the proportion of claim 1, aluminum wire with a purity of 99.9% and oxygen are introduced above the evaporation zone of the evaporation boat, and a microwave plasma system for ionizing oxygen and aluminum vapor is arranged in the evaporation zone, so that aluminum oxide is deposited on the surface of the base film layer to form an enhanced reaction layer; wherein the oxygen introduction amount is 6.2-8L / min, and the evaporation rate of aluminum is 1-8.5g / min; the power of the microwave plasma system is 1.5-5kW, and the microwave operating frequency is 2600MHz; then stop introducing oxygen into the evaporation zone, so that aluminum vapor is deposited on the surface of the enhanced reaction layer to form an aluminum-plated barrier layer, and after cooling, cleaning with a cleaning agent again, and measuring the thickness, an enhanced aluminum-plated base film can be obtained.

7. The preparation method according to claim 6, characterized in that: The temperature range of the cooling process in step S3 is 20-45°C.

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