A low-reflection explosion-proof multi-layer composite film and its preparation process

Abstract

The present invention relates to the technical field of composite films, specifically a low-reflection explosion-proof multi-layer composite film and its preparation process, which comprises a base film, an antireflection layer, and a protective layer laminated in sequence. A self-healing prepolymer, amino-functionalized composite zinc oxide, a leveling agent, and a dialdehyde-based ionic liquid are introduced to construct a low-reflection explosion-proof multi-layer composite film with a self-healing antibacterial superhydrophobic surface; an amino-terminated polydimethylsiloxane reacts with diphenylmethane diisocyanate and isophorone diisocyanate to prepare a prepolymer containing silicone, and then diaminodiphenyl disulfide is used as a chain extender, and polyether triol and perfluorooctylethanol are used as end-capping agents; titanium dioxide is first synthesized on the surface of zinc oxide, and using the hydroxyl groups on its surface, asparagine is used as a raw material to obtain amino-functionalized composite zinc oxide; a dialdehyde-based ionic liquid is introduced into the protective layer.

Description

Technical Field

[0001] The present invention relates to the field of composite films, and specifically to a low-reflection explosion-proof multi-layer composite film and a preparation process thereof. Background Art

[0002] With the development of society, the wide application of glass materials in various industries, such as construction, automotive, furniture and other fields, has led to an increase in glass films. With the progress of technology, consumers' requirements for glass films are also developing towards multi-functionalization, such as using films to enhance the heat insulation, ultraviolet resistance and other properties of glass.

[0003] With the increasing use of glass, using glass films to improve its explosion-proof property has important safety significance. At the same time, in the furniture, construction and automotive industries, people have close contact with glass, and thus more bacteria are generated, especially for glass in public places and public spaces. Therefore, it is required that the glass film has antibacterial properties to improve its use safety. At the same time, the existing glass films have weak anti-mechanical damage ability, and their performance will be greatly reduced after being scratched. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-reflection explosion-proof multi-layer composite film and a preparation process thereof to solve the problems in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A low-reflection explosion-proof multi-layer composite film, comprising a base film, an anti-reflection layer and a protective layer laminated in sequence;

[0007] The anti-reflection layer is prepared from the following components: a self-healing prepolymer, an amino-functionalized composite zinc oxide, and a leveling agent;

[0008] The protective layer is prepared from the following components: a self-healing prepolymer, an amino-functionalized composite zinc oxide, a dialdehyde-based ionic liquid, a leveling agent, and a solvent.

[0009] Further, the base film is one of polypropylene, polyethylene terephthalate, and polyethylene imine.

[0010] Further, the mass ratio of the self-healing prepolymer to the amino-functionalized composite zinc oxide in the anti-reflection layer is 10:1.

[0011] Further, by weight, the contents of the components in the protective layer are: 45-49 parts of self-healing prepolymer, 1-2 parts of amino-functionalized composite zinc oxide, 1-2 parts of dialdehyde-based ionic liquid, 1-2 parts of leveling agent, and 4-7 parts of solvent.

[0012] Further, the preparation of the self-healing prepolymer includes the following steps:

[0013] Under a nitrogen atmosphere, tetrahydrofuran, dichloromethane, and 3-aminopropyl polydimethylsiloxane were mixed, and a mixed solution of diphenylmethane diisocyanate, isophorone diisocyanate, tetrahydrofuran, and dichloromethane was added. The mixture was stirred in an ice-water bath for 4 - 5 h, and then a mixed solution of diaminodiphenyl disulfide, tetrahydrofuran, and dichloromethane was added. After continuing to stir for 4 - 5 h, a mixed solution of polyether triol, perfluorooctyl ethanol, and tetrahydrofuran was added. The temperature was raised to 78 - 82 °C, stannous octoate was added, and the mixture was stirred for 1 - 2 h. Then, the product was discharged to obtain a self-healing prepolymer.

[0014] Further, the mass molar ratio of 3-aminopropyl polydimethylsiloxane, diphenylmethane diisocyanate, isophorone diisocyanate, diaminodiphenyl disulfide, polyether triol, and perfluorooctyl ethanol is 3 g : 4.8 mmol : 11.2 mmol : 2 mmol : 0.5 mmol : 0.5 mmol.

[0015] Further, the leveling agent is a polyether-modified silicone leveling agent.

[0016] Further, the preparation of the amino-functionalized composite zinc oxide includes the following steps:

[0017] 1) Tetrabutyl titanate and absolute ethanol were mixed, and a hot mixed solution of zinc oxide and deionized water was added. 0 glacial acetic acid was added, and the mixture was stirred for 50 - 60 min, dried, ground, and kept at 695 - 705 °C for 2 h to obtain composite zinc oxide;

[0018] 2) Under a nitrogen atmosphere, the composite zinc oxide and deionized water were mixed, and a mixed solution of EDC, 4-dimethylaminopyridine, and deionized water was added. D-asparagine was added, and the temperature was raised to 95 - 100 °C and kept for 3 h. Then, it was washed, centrifuged, and dried to obtain the amino-functionalized composite zinc oxide.

[0019] Further, the preparation of the dialdehyde-based ionic liquid includes the following steps: 4,4'-bipyridine, 4-bromomethylbenzaldehyde, and acetonitrile were mixed and kept at 78 - 82 °C for 22 - 24 h. After cooling and filtering, the dialdehyde-based ionic liquid was obtained.

[0020] A preparation process for a low-reflection explosion-proof multi-layer composite film includes the following steps:

[0021] S1: Select one of polypropylene, polyethylene terephthalate, and polyethyleneimine as the base film;

[0022] S2: Prepare an anti-reflection coating with the self-healing prepolymer, amino-functionalized composite zinc oxide, and leveling agent, and coat the anti-reflection coating on the surface of the base film and cure it to form an anti-reflection layer;

[0023] S3: Mix a self-healing prepolymer, amino-functionalized composite zinc oxide, dialdehyde-based ionic liquid, leveling agent, and solvent, and stir ultrasonically for 20 - 30 min to obtain a protective coating. Coat the protective coating on the antireflection layer and cure it to form a protective layer, thereby obtaining a low-reflection explosion-proof multi-layer composite film.

[0024] Advantages of the present invention:

[0025] The present invention provides a low-reflection explosion-proof multi-layer composite film and its preparation process. The low-reflection explosion-proof multi-layer composite film includes a base film, an antireflection layer, and a protective layer laminated in sequence. A self-healing prepolymer, amino-functionalized composite zinc oxide, and dialdehyde-based ionic liquid are introduced to construct a low-reflection explosion-proof multi-layer composite film with a self-healing antibacterial superhydrophobic surface.

[0026] In the present invention, by preparing a self-healing prepolymer, an antireflection coating base material with excellent waterproof performance, good elasticity, strong adhesion, and corrosion resistance is obtained. Among them, an organosilicon-containing prepolymer is prepared using amino-terminated polydimethylsiloxane, diphenylmethane diisocyanate, and isophorone diisocyanate, and then diaminodiphenyl disulfide is used as a chain extender to introduce a dynamic disulfide bond, endowing the antireflection coating with self-healing properties. Using polyether triol and perfluorooctyl ethanol as end-capping agents, the cohesive energy of the ether bond is relatively low and it is easy to rotate, and it is easily miscible with components such as isocyanate and additives, thereby improving the low-temperature resistance and water resistance of the coating. Perfluorooctyl ethanol is introduced to improve its hydrophobicity; polyether-modified organosilicon is selected as the leveling agent, which endows the coating with a low surface tension and anti-cratering ability, and can also improve the slipperiness and leveling property.

[0027] Titanium dioxide and zinc oxide are introduced into the antireflection layer to improve its antireflection and light transmittance properties. To improve the uniformity of the dispersion of titanium dioxide and zinc oxide in the antireflection layer, titanium dioxide is first synthesized on the surface of zinc oxide, and using the hydroxyl groups on its surface, asparagine is used as a raw material and modified through an esterification reaction to obtain amino-functionalized composite zinc oxide, which is introduced into the antireflection layer to greatly improve its toughness and antibacterial properties.

[0028] A dialdehyde-based ionic liquid is introduced into the protective layer, which reacts with amino-functionalized composite zinc oxide to form an imine bond, thereby synergistically enhancing the self-healing property of the protective layer. By controlling the introduction amounts of the dialdehyde-based ionic liquid and amino-functionalized composite zinc oxide, a superhydrophobic protective layer is constructed, effectively improving the service life of the composite film. Specific embodiments

[0029] The technical solutions in the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, and back, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0031] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0032] Embodiment 1: A preparation process of a low-reflection explosion-proof multi-layer composite film, comprising the following steps:

[0033] S1: Take polyethylene terephthalate as the base film;

[0034] S2: Prepare an anti-reflection coating with a self-healing prepolymer, amino-functionalized composite zinc oxide, and a leveling agent. Coat the anti-reflection coating on the surface of the base film and cure it to form an anti-reflection layer;

[0035] The mass ratio of the self-healing prepolymer to the amino-functionalized composite zinc oxide in the anti-reflection layer is 10:1;

[0036] The preparation of the self-healing prepolymer includes the following steps:

[0037] Under a nitrogen atmosphere, mix 36 mL of tetrahydrofuran, 4 mL of dichloromethane, and 6 g of 3-aminopropyl polydimethylsiloxane, add a mixture of 9.6 mmol of diphenylmethane diisocyanate, 22.4 mmol of isophorone diisocyanate, 36 mL of tetrahydrofuran, and 4 mL of dichloromethane, stir for 4 h in an ice-water bath, add a mixture of 4 mmol of diaminodiphenyl disulfide, 18 mL of tetrahydrofuran, and 2 mL of dichloromethane, continue to stir for 4 h, then add a mixture of 1 mmol of polyether triol, 1 mmol of perfluorooctyl ethanol, and 18 mL of tetrahydrofuran, raise the temperature to 78 °C, add 10 mg of stannous octoate, stir for 1 h, and discharge to obtain the self-healing prepolymer;

[0038] The preparation of the amino-functionalized composite zinc oxide includes the following steps:

[0039] 1) Mix 30 mL of tetrabutyl titanate and 120 mL of absolute ethanol, add a mixture of 0.43 g of zinc oxide and 10 mL of deionized water, add 2 mL of glacial acetic acid, stir for 50 min, dry and grind, and keep warm at 695 °C for 2 h to obtain composite zinc oxide;

[0040] 2) Under a nitrogen atmosphere, 0.2 g of composite zinc oxide and 3 mL of deionized water were mixed, and a mixed solution of 1 mg of EDC, 1 mg of 4-dimethylaminopyridine, and 1 mL of deionized water was added. Then 0.14 g of D-asparagine was added, and the temperature was raised to 95 °C and kept warm for 3 h. After washing, centrifuging, and drying, amino-functionalized composite zinc oxide was obtained;

[0041] The preparation of the dialdehyde-functionalized ionic liquid includes the following steps: 2 mmol of 4,4'-bipyridine, 5 mmol of 4-bromomethylbenzaldehyde, and 40 mL of acetonitrile were mixed and kept warm at 78 °C for 24 h. After cooling and filtering, the dialdehyde-functionalized ionic liquid was obtained;

[0042] S3: By weight, 45 parts of the self-healing prepolymer, 1 part of the amino-functionalized composite zinc oxide, 1 part of the dialdehyde-functionalized ionic liquid, 1 part of the leveling agent, and 4 parts of the solvent were mixed and ultrasonically stirred for 20 min to obtain a protective coating. The protective coating was coated on the antireflection layer and cured to form a protective layer, and a low-reflection explosion-proof multi-layer composite film was obtained.

[0043] Example 2: A preparation process of a low-reflection explosion-proof multi-layer composite film, including the following steps:

[0044] S1: Polyethylene terephthalate was taken as the base film;

[0045] S2: An antireflection coating was prepared with a self-healing prepolymer, amino-functionalized composite zinc oxide, and a leveling agent. The antireflection coating was coated on the surface of the base film and cured to form an antireflection layer;

[0046] The mass ratio of the self-healing prepolymer to the amino-functionalized composite zinc oxide in the antireflection layer was 10:1;

[0047] The preparation of the self-healing prepolymer includes the following steps:

[0048] Under a nitrogen atmosphere, 36 mL of tetrahydrofuran, 4 mL of dichloromethane, and 6 g of 3-aminopropylpolydimethylsiloxane were mixed, and a mixed solution of 9.6 mmol of diphenylmethane diisocyanate, 22.4 mmol of isophorone diisocyanate, 36 mL of tetrahydrofuran, and 4 mL of dichloromethane was added. Stirring was carried out in an ice-water bath for 4.5 h, and a mixed solution of 4 mmol of diaminodiphenyl disulfide, 18 mL of tetrahydrofuran, and 2 mL of dichloromethane was added. After continuing to stir for 4.5 h, then a mixed solution of 1 mmol of polyether triol, 1 mmol of perfluorooctyl ethanol, and 18 mL of tetrahydrofuran was added. The temperature was raised to 80 °C, 10 mg of stannous octoate was added, and stirring was carried out for 1.5 h. Then the product was discharged to obtain the self-healing prepolymer;

[0049] The preparation of the amino-functionalized composite zinc oxide includes the following steps:

[0050] 1) Mix 30 mL of tetrabutyl titanate and 120 mL of absolute ethanol, add a mixed solution of 0.43 g of zinc oxide and 10 mL of deionized water, add 2 mL of glacial acetic acid, stir for 55 min, dry and grind, and keep at 700 °C for 2 h to obtain composite zinc oxide;

[0051] 2) Under a nitrogen atmosphere, mix 0.2 g of composite zinc oxide and 3 mL of deionized water, add a mixed solution of 1 mg of EDC, 1 mg of 4-dimethylaminopyridine, and 1 mL of deionized water, add 0.14 g of D-asparagine, heat up to 98 °C and keep for 3 h, wash, centrifuge, and dry to obtain amino-functionalized composite zinc oxide;

[0052] The preparation of the dialdehyde-functionalized ionic liquid includes the following steps: Mix 2 mmol of 4,4'-bipyridine, 5 mmol of 4-bromomethylbenzaldehyde, and 40 mL of acetonitrile, keep at 80 °C for 23 h, cool and filter to obtain the dialdehyde-functionalized ionic liquid;

[0053] S3: By weight, mix 47 parts of the self-healing prepolymer, 1.5 parts of amino-functionalized composite zinc oxide, 1.5 parts of the dialdehyde-functionalized ionic liquid, 1.5 parts of the leveling agent, and 5 parts of the solvent, stir ultrasonically for 25 min to obtain the protective coating. Coat the protective coating on the antireflection layer, cure to form a protective layer, and obtain a low-reflection explosion-proof multi-layer composite film.

[0054] Example 3: A preparation process of a low-reflection explosion-proof multi-layer composite film, including the following steps:

[0055] S1: Take polyethylene terephthalate as the base film;

[0056] S2: Prepare an antireflection coating with the self-healing prepolymer, amino-functionalized composite zinc oxide, and leveling agent, coat the antireflection coating on the surface of the base film, and cure to form an antireflection layer;

[0057] The mass ratio of the self-healing prepolymer to the amino-functionalized composite zinc oxide in the antireflection layer is 10:1;

[0058] The preparation of the self-healing prepolymer includes the following steps:

[0059] Under a nitrogen atmosphere, 36 mL of tetrahydrofuran, 4 mL of dichloromethane, and 6 g of 3-aminopropyl polydimethylsiloxane were mixed, and a mixed solution of 9.6 mmol of diphenylmethane diisocyanate, 22.4 mmol of isophorone diisocyanate, 36 mL of tetrahydrofuran, and 4 mL of dichloromethane was added. The mixture was stirred in an ice-water bath for 5 h, and then a mixed solution of 4 mmol of diaminodiphenyl disulfide, 18 mL of tetrahydrofuran, and 2 mL of dichloromethane was added. After continuing to stir for 5 h, a mixed solution of 1 mmol of polyether triol, 1 mmol of perfluorooctyl ethanol, and 18 mL of tetrahydrofuran was added. The temperature was raised to 82 °C, 10 mg of stannous octoate was added, and the mixture was stirred for 2 h. Then the product was discharged to obtain a self-healing prepolymer;

[0060] The preparation of the amino-functionalized composite zinc oxide includes the following steps:

[0061] 1) 30 mL of tetrabutyl titanate and 120 mL of absolute ethanol were mixed, and a mixed solution of 0.43 g of zinc oxide and 10 mL of deionized water was added. Then 2 mL of glacial acetic acid was added, and the mixture was stirred for 60 min, dried, ground, and kept at 705 °C for 2 h to obtain composite zinc oxide;

[0062] 2) Under a nitrogen atmosphere, 0.2 g of composite zinc oxide and 3 mL of deionized water were mixed, and a mixed solution of 1 mg of EDC, 1 mg of 4-dimethylaminopyridine, and 1 mL of deionized water was added. Then 0.14 g of D-asparagine was added, and the temperature was raised to 100 °C and kept for 3 h. After washing, centrifuging, and drying, amino-functionalized composite zinc oxide was obtained;

[0063] The preparation of the dialdehyde-based ionic liquid includes the following steps: 2 mmol of 4,4'-bipyridine, 5 mmol of 4-bromomethylbenzaldehyde, and 40 mL of acetonitrile were mixed and kept at 82 °C for 22 h. After cooling and filtering, the dialdehyde-based ionic liquid was obtained;

[0064] S3: By weight, 49 parts of the self-healing prepolymer, 2 parts of the amino-functionalized composite zinc oxide, 2 parts of the dialdehyde-based ionic liquid, 2 parts of the leveling agent, and 7 parts of the solvent were mixed and ultrasonically stirred for 30 min to obtain a protective coating. The protective coating was coated on the antireflection layer and cured to form a protective layer, obtaining a low-reflection explosion-proof multi-layer composite film.

[0065] Comparative Example 1: Taking Example 3 as the control group, diaminodiphenyl disulfide was not added, and other processes were normal.

[0066] Comparative Example 2: Taking Example 3 as the control group, zinc oxide was used to replace the amino-functionalized composite zinc oxide, and other processes were normal.

[0067] Comparative Example 3: Taking Example 3 as the control group, the dialdehyde-based ionic liquid was not prepared, and other processes were normal.

[0068] In the examples and comparative examples, the leveling agent is a polyether-modified silicone leveling agent, the solvent is tetrahydrofuran, and the thickness of the multi-layer composite film is 0.6 mm, with the base film, antireflection layer, and waterproof layer each being 0.2 mm.

[0069] Source of raw materials:

[0070] The base film was extruded from (polyethylene terephthalate (industrial grade): Hubei Chengfeng Chemical Co., Ltd.); diphenylmethane diisocyanate 101-68-8: Wuhan Jixin Yibang Biotechnology Co., Ltd.; polyether triol (polyoxypropylene triol 2000): Jinjinle Chemical Co., Ltd.; perfluorooctyl ethanol 532789: Sigma-Aldrich (Shanghai) Trading Co., Ltd.; EDC 25952-53-8: Shandong Jincheng Pharmaceutical Group Co., Ltd.; polyether-modified silicone leveling agent BYK-333: BYK Chemie; tetrahydrofuran T431413, 3-aminopropyl polydimethylsiloxane B305072, isophorone diisocyanate I109582, diaminodiphenyl disulfide A101817, stannous octoate T100108, tetrabutyl titanate T104104, zinc oxide Z431821, 4-dimethylaminopyridine D109207, D-asparagine D121586, 4,4'-bipyridine B105217, 4-bromomethylbenzaldehyde B184885; Aladdin reagents; dichloromethane, absolute ethanol, glacial acetic acid, acetonitrile, analytical grade: reagents from Sinopharm Group.

[0071] Performance testing: The composite films prepared in the examples and comparative examples were tested:

[0072] Transmittance: The average transmittance in the 400-800 nm wavelength band was tested; antibacterial property: Using Staphylococcus aureus as the strain, the plate method was used for testing; hydrophobicity: Characterized by the water contact angle, and tested with 2 μL deionized water droplets; self-healing property: Scratches with a length of 0.1 mm, width of 0.1 mm, and depth of 0.1 mm were made on the surface of the composite film, and it was incubated at 30 °C for 24 h, and the transmittance before and after the scratch test was measured, and the ratio was the self-healing rate; the results are shown in Table 1.

[0073]

[0074] As can be seen from Table 1, for the multi-layer composite film prepared according to the present invention, its average transmittance in the 400-800 nm wavelength band is 97.6-98.1%, the anti-Staphylococcus aureus rate is 99.8-99.9%, the contact angle is 150-151°, and the self-healing rate is 99.9-100%, indicating that the low-reflection explosion-proof multi-layer composite film prepared in this application has a self-healing antibacterial superhydrophobic surface.

[0075] Comparing Example 3 with Comparative Example 1, it can be seen that in the present invention, by preparing a self-healing prepolymer, an antireflection coating base material with excellent waterproof performance, good elasticity, strong adhesion and corrosion resistance is obtained. Among them, an organosilicon-containing prepolymer is prepared by using amino-terminated polydimethylsiloxane, diphenylmethane diisocyanate and isophorone diisocyanate, and then diaminodiphenyl disulfide is used as a chain extender to introduce a dynamic disulfide bond, endowing the antireflection coating with self-healing properties. Using polyether triol and perfluorooctylethanol as capping agents, the cohesive energy of the ether bond is relatively low, and it is easy to rotate and is easily miscible with components such as isocyanates and additives, thereby improving the low-temperature resistance and water resistance of the coating. Perfluorooctylethanol is introduced to improve its hydrophobicity.

[0076] Comparing Example 3 with Comparative Example 2, it can be seen that titanium dioxide and zinc oxide are introduced into the antireflection layer to improve its antireflection and antireflection properties. To improve the uniformity of the dispersion of titanium dioxide and zinc oxide in the antireflection layer, titanium dioxide is first synthesized on the surface of zinc oxide. Using the hydroxyl groups on its surface, asparagine is used as a raw material and modified by an esterification reaction to obtain amino-functionalized composite zinc oxide. Introducing it into the antireflection layer greatly improves its toughness and antibacterial properties.

[0077] Comparing Example 3 with Comparative Example 3, it can be seen that dialdehyde-based ionic liquid is introduced into the protective layer to react with amino-functionalized composite zinc oxide to form imine bonds, thereby greatly improving its self-healing properties and toughness. By controlling the introduction amounts of the dialdehyde-based ionic liquid and the amino-functionalized composite zinc oxide, a superhydrophobic protective layer is constructed, effectively improving the service life of the composite film.

[0078] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural transformations made using the description of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A low-reflection explosion-proof multi-layer composite film, characterized in that, It includes a base film, an antireflection layer, and a protective layer laminated in sequence; The antireflection layer is prepared from the following components: a self-healing prepolymer, amino-functionalized composite zinc oxide, and a leveling agent; The protective layer is prepared from the following components: a self-healing prepolymer, amino-functionalized composite zinc oxide, dialdehyde-based ionic liquid, a leveling agent, and a solvent; The preparation of the self-healing prepolymer includes the following steps: Under a nitrogen atmosphere, mix tetrahydrofuran, dichloromethane, and 3-aminopropyl polydimethylsiloxane, add a mixed solution of diphenylmethane diisocyanate, isophorone diisocyanate, tetrahydrofuran, and dichloromethane, stir for 4 - 5 h in an ice-water bath, add a mixed solution of diaminodiphenyl disulfide, tetrahydrofuran, and dichloromethane, continue to stir for 4 - 5 h, then add a mixed solution of polyether triol, perfluorooctyl ethanol, and tetrahydrofuran, raise the temperature to 78 - 82 °C, add stannous octoate, stir for 1 - 2 h, and discharge to obtain the self-healing prepolymer; In the preparation of the self-healing prepolymer, the mass molar ratio of 3-aminopropyl polydimethylsiloxane, diphenylmethane diisocyanate, isophorone diisocyanate, diaminodiphenyl disulfide, polyether triol, and perfluorooctyl ethanol is 3 g : 4.8 mmol : 11.2 mmol : 2 mmol : 0.5 mmol : 0.5 mmol; The preparation of the amino-functionalized composite zinc oxide includes the following steps: 1) Mix tetrabutyl titanate and absolute ethanol, add a hot mixed solution of zinc oxide and deionized water, add glacial acetic acid, stir for 50 - 60 min, dry and grind, and keep at 695 - 705 °C for 2 h to obtain composite zinc oxide; 2) Under a nitrogen atmosphere, mix the composite zinc oxide and deionized water, add a mixed solution of EDC, 4-dimethylaminopyridine, and deionized water, add D-asparagine, raise the temperature to 95 - 100 °C and keep for 3 h, wash, centrifuge, and dry to obtain the amino-functionalized composite zinc oxide; The preparation of the dialdehyde-based ionic liquid includes the following steps: Mix 4,4'-bipyridine, 4-bromomethylbenzaldehyde, and acetonitrile, keep at 78 - 82 °C for 22 - 24 h, cool and filter to obtain the dialdehyde-based ionic liquid.

2. The low-reflection explosion-proof multi-layer composite film according to claim 1, wherein The base film is one of polypropylene, polyethylene terephthalate, and polyethyleneimine.

3. The low-reflection explosion-proof multi-layer composite film according to claim 1, characterized in that, In the antireflection layer, the mass ratio of the self-healing prepolymer to the amino-functionalized composite zinc oxide is 10 :

1.

4. The low-reflection explosion-proof multi-layer composite film according to claim 1, characterized in that, By weight, the content of each component in the protective layer is: 45 - 49 parts of the self-healing prepolymer, 1 - 2 parts of the amino-functionalized composite zinc oxide, 1 - 2 parts of the dialdehyde-based ionic liquid, 1 - 2 parts of the leveling agent, and 4 - 7 parts of the solvent.

5. A low-reflection explosion-proof multi-layer composite film according to claim 1, characterized in that, The leveling agent is a polyether-modified silicone leveling agent.

6. A preparation process of a low-reflection explosion-proof multi-layer composite film, applicable to a low-reflection explosion-proof multi-layer composite film as described in any one of claims 1-5, characterized in that, It includes the following steps: S1: Select one of polypropylene, polyethylene terephthalate, and polyethyleneimine as the base film; S2: Prepare an antireflection coating with the self-healing prepolymer, amino-functionalized composite zinc oxide, and a leveling agent, coat the antireflection coating on the surface of the base film, and cure to form the antireflection layer; S3: Mix the self-healing prepolymer, amino-functionalized composite zinc oxide, dialdehyde-based ionic liquid, leveling agent, and solvent, stir ultrasonically for 20 - 30 min to obtain a protective coating, coat the protective coating on the antireflection layer, and cure to form the protective layer, obtaining a low-reflection explosion-proof multi-layer composite film.

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