Preparation method and construction process of special adhesive interface agent for transparent air cushion film

Abstract

The application relates to the field of coating for increasing adhesion of air cushion films, in particular to a preparation method and construction process of an adhesion interface agent special for transparent air cushion films. The adhesion interface agent special for transparent air cushion films is coated on an air cushion film base material made of ETFE, PE, PP or EVA, can increase the adhesion function of the air cushion film and other functional coatings, the coatings can not fall off, not age and not become brittle in long-term outdoor use or under strong light, can reduce heat accumulation caused by infrared rays, and increase the use performance and service life of the air cushion film. The interface agent has good adhesion and mechanical properties, and also has good waterproof, wear resistance, aging resistance, high and low temperature resistance and stain resistance. The air cushion film interface agent has the advantages of convenient construction, low cost, good adhesion effect, wide adaptability and the like, and solves the pain point that the coating cannot be directly attached on the air cushion film.

Description

Technical Field

[0001] This application relates to the field of auxiliary materials for functional modification of cushion films, and in particular to a method for preparing and applying a special adhesive interface agent for transparent cushion films. It is applicable to the interface bonding modification of transparent cushion films made of ETFE, PE, PP, and EVA materials with UV protection and infrared heat insulation functional coatings, and belongs to the field of interface treatment technology for functional film materials. Background Technology

[0002] Transparent cushion film, with its advantages of lightweight cushioning, moisture and shock resistance, high light transmittance, and cost-effectiveness, is widely used in packaging protection, building shading, outdoor products, and automotive interiors. To address the shortcomings of traditional cushion films, such as poor weather resistance and lack of heat insulation and sun protection, the industry generally adopts a surface coating method to upgrade the functionality of cushion films. By coating with UV-resistant and infrared heat-insulating coatings, the sun protection, heat insulation, and anti-aging properties of the cushion film are improved.

[0003] However, transparent cushion films made of ETFE, PE, PP, and EVA are low surface energy polymers with strong surface inertness, no active functional groups, and low interfacial tension, presenting significant coating challenges. When conventional heat-insulating coatings are directly applied to the surface of the cushion film, the coating and substrate can only form a physical bond, failing to achieve chemical bonding. This generally results in poor adhesion, easy peeling, weak abrasion resistance, and delamination after aging. Especially under outdoor high temperatures, rain, and long-term UV exposure, the coating is prone to cracking, peeling, and detachment, directly causing the cushion film's UV and infrared blocking functions to fail, significantly shortening the product's lifespan and hindering the large-scale promotion and application of functionalized cushion films.

[0004] Currently, there are significant shortcomings in the technology for modifying the interface of air cushion films in the industry: First, traditional physical modification methods such as sanding and corona treatment can only slightly improve the surface roughness of the substrate, with short-lived modification effects, failing to achieve long-term adhesion, and easily damaging the transparent air cushion film substrate, leading to whitening of the film, decreased light transmittance, and impaired mechanical properties; Second, general-purpose plastic interface agents have poor compatibility with the air cushion film substrate, easily causing pinholes, orange peel, and whitening, damaging the transparency of the air cushion film, and also having poor compatibility with subsequent heat insulation coatings, resulting in obvious interface delamination; Third, most existing interface agents are opaque systems, which cannot meet the high light transmittance requirements of transparent air cushion films, and their resistance to high and low temperatures and weathering is insufficient, making them unsuitable for long-term outdoor use scenarios.

[0005] In summary, existing technologies lack a dedicated interface agent and standardized construction process that is suitable for transparent cushion films, possesses high transparency, high adhesion, excellent weather resistance, and can perfectly match UV- and infrared heat-insulating coatings. To address the shortcomings of existing technologies, this application develops a dedicated adhesion interface agent for transparent cushion films. Through a specially modified formula with modified functional groups, it constructs a transitional bonding interface between the substrate and the functional coating without affecting the light transmittance and cushioning mechanical properties of the cushion film, completely solving the industry pain points of coating peeling, delamination, and poor weather resistance. Summary of the Invention

[0006] The purpose of this application is to provide a method for preparing and applying a special adhesive interface agent for transparent air cushion films, solving the technical problems of weak adhesion, easy delamination, poor light transmittance, and insufficient weather resistance of existing transparent air cushion films and functional coatings. This interface agent is specifically designed for ETFE, PE, PP, and EVA transparent air cushion films, and combines high transparency, excellent interfacial adhesion, high and low temperature resistance, and aging resistance. It can form a dense transition interface between the substrate and the heat insulation functional coating, significantly improving the coating adhesion and long-term stability. Moreover, it is easy to apply, low in cost, and does not affect the original cushioning and light transmittance properties of the air cushion film.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] The first aspect of this application provides a special adhesion interface agent for transparent air cushion films, adapted to ETFE, PE, PP, and EVA transparent air cushion film substrates, for bonding air cushion film substrates with UV-resistant and infrared heat-insulating functional coatings. By weight, the raw materials of the adhesion interface agent include: 35-55 parts of modified transparent polyurethane emulsion, 5-12 parts of fluorinated silicone coupling agent, 8-15 parts of polyurethane polymer microsphere adhesive, 6-12 parts of transparent functional additives, 20-30 parts of transparent diluent, 0.8-3 parts of leveling aid, 0.5-2.5 parts of wetting and dispersing aid, and 0.3-1.5 parts of anti-agglomeration aid.

[0009] The modified transparent polyurethane emulsion is a hydroxyl-modified aliphatic polyurethane emulsion with a solid content of 42~48wt%, a viscosity of 400~1000mPa·s (23±1℃, 4# / 60rad), and a light transmittance of ≥92%. The molecular chain contains active hydroxyl and ester functional groups, which can form physical intercalation and chemical bonding with the air cushion film substrate and functional coating, respectively.

[0010] The fluorinated silicone coupling agent is a compound composition of perfluorooctyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, with a mass ratio of (1.5~2.5):1. It has both low surface energy wetting and chemical bond grafting functions, which can effectively improve the interfacial activity of inert air cushion film substrate.

[0011] The polyurethane polymer microsphere adhesive is a functionally modified polyurethane microsphere selected from one of cross-linked polyurethane microspheres, polyurethane-acrylic core-shell microspheres, and surface-functionalized polyurethane microspheres; it is used to toughen the adhesive layer, reduce internal stress, improve interfacial adhesion, improve the wear resistance of the adhesive layer, enhance the flexibility and bonding strength of the interfacial layer, and prevent the interface from becoming brittle and falling off.

[0012] The transparent functional additive is a compound composition of weather stabilizer, transparent toughening agent and UV-resistant additive, with a mass ratio of (2~3):(1.5~2.5):(1~2); the weather stabilizer is a hindered amine transparent stabilizer, the transparent toughening agent is a polyether transparent toughening agent, and the UV-resistant additive is a transparent benzotriazole UV absorber.

[0013] The transparent diluent is a compound system of ethyl acetate, anhydrous ethanol, and propylene glycol methyl ether, with a mass ratio of (3~4):(1~2):(0.5~1). It has a mild evaporation rate, forms a uniform film, leaves no residual white mist, and ensures high light transmittance at the interface.

[0014] The leveling agent is a silicone transparent leveling agent BYK-333, the wetting and dispersing agent is a nonionic transparent wetting agent, and the anti-agglomeration agent is a polyether transparent anti-agglomeration agent.

[0015] As a preferred embodiment, a special adhesive interface agent for transparent air cushion film comprises, by weight, the following raw materials: 40-48 parts of modified transparent polyurethane emulsion, 7-10 parts of fluorinated silicone coupling agent, 10-13 parts of polyurethane polymer microsphere adhesive, 8-10 parts of transparent functional additive, 22-28 parts of transparent diluent, 1.2-2.2 parts of leveling agent, 1-2 parts of wetting and dispersing agent, and 0.5-1.2 parts of anti-agglomeration agent.

[0016] As a preferred embodiment, the mass ratio of the modified transparent polyurethane emulsion, the fluorinated silicone coupling agent, and the polyurethane polymer microsphere adhesive is (42~45):(8~9):(11~12).

[0017] As a preferred embodiment, the mass ratio of perfluorooctyltriethoxysilane to γ-glycidoxypropyltrimethoxysilane in the fluorinated silicone coupling agent is 2:1.

[0018] As a preferred embodiment, the polyurethane polymer microsphere adhesive is a functionally modified polyurethane microsphere, selected from one of the following: cross-linked polyurethane microspheres, polyurethane-acrylic core-shell microspheres, and surface-functionalized polyurethane microspheres.

[0019] The second aspect of this application provides a method for preparing a special adhesion interface agent for transparent air cushion film, specifically including the following steps:

[0020] S1. Premixed solvent system: Add the transparent diluent, wetting and dispersing agent, and anti-agglomeration agent to a high-speed disperser according to the formula. Stir at 800~1000 rpm for 10~15 min at room temperature until the system is completely transparent, without layering or particles, to obtain a uniform transparent solvent premix.

[0021] S2. Base material mixing and modification: Add modified transparent polyurethane emulsion and polyurethane polymer microsphere binder to the solvent premix, heat to 35~45℃, adjust the speed to 1200~1400rpm, and stir at high speed for 20~30min to make the resin system completely swell and disperse to form a uniform transparent base material system.

[0022] S3. Functional component compounding: Cool down to 25~30℃, slowly add compounded fluorine-silicon coupling agent dropwise, keep warm and stir for 15~20min after the addition is completed, then add transparent functional additives, stir at 900~1100rpm for 12~18min to achieve uniform doping of functional components.

[0023] S4. Leveling and refining: Finally, add the leveling agent and stir at a low speed of 600~800rpm for 8~12min to eliminate air bubbles and pinholes in the system. After filtration, obtain a transparent air cushion film special adhesion interface agent, seal and store in the dark for later use.

[0024] The third aspect of this application provides a construction process for a special adhesion interface agent for transparent air cushion film, used for interface pretreatment between transparent air cushion film and anti-ultraviolet and infrared heat insulation functional coatings. The specific steps are as follows:

[0025] S1. Substrate pretreatment: Select clean, undamaged, and oil-free ETFE / PE / PP / EVA transparent air cushion film. Wipe the substrate surface with anhydrous ethanol to remove dust, oil, and impurities. Allow it to air dry at room temperature for 5-10 minutes to ensure the substrate surface is clean and dry. No grinding or corona treatment is required, preserving the original light transmittance and mechanical properties of the substrate.

[0026] S2. Interface agent coating: The prepared interface agent is uniformly coated on one side of the air cushion film by spraying, roller coating or scraping. The dry film thickness is controlled to be 10~30μm. The coating process is carried out at a uniform speed to ensure that the film layer is uniform, without missed coating, accumulation or sagging.

[0027] S3. Interface layer curing: Place the air cushion film coated with interface agent in a constant temperature environment of 50~70℃ for 2~4 hours, or let it air dry at room temperature for 20~24 hours to form a dense, transparent, and highly active interface transition layer.

[0028] S4. Functional Coating Recoating: After the interface layer is fully cured, roll, spray or scrape an anti-ultraviolet and infrared heat insulation functional coating on the surface of the interface layer. Control the thickness of the functional coating to 10~30μm, and complete the curing according to the corresponding coating curing process to finally obtain a functional transparent air cushion film with strong interface bonding, high transparency and excellent weather resistance.

[0029] As the preferred construction method, the dry film thickness of the interface agent is controlled at 10~30μm, the constant temperature curing temperature is 50℃, and the curing time is 3h. This method achieves the best interface bonding effect without affecting the overall light transmittance.

[0030] The fourth aspect of this application provides the application of the above-mentioned special adhesive interface agent for transparent air cushion film, which can be widely used in the functional modification of transparent air cushion film in the fields of packaging protection, building sunshade, outdoor tents, automotive interiors, and outdoor protective products. It is suitable for the pretreatment of various anti-ultraviolet, infrared heat insulation coatings, and waterproof and anti-fouling coatings, and effectively solves the problems of coating peeling, delamination, and poor weather resistance of low surface energy air cushion film substrates. Detailed Implementation

[0031] The technical solution of this application will be described in detail below with reference to specific embodiments. The following embodiments are only used to explain this application and are not intended to limit the scope of protection of this application. The raw materials used in this application are all commercially available conventional industrial-grade raw materials, and there are no special limitations.

[0032] Example 1

[0033] A special adhesive interface agent for transparent air cushion film, with the following raw material ratio by weight: 42 parts modified transparent polyurethane emulsion, 8.5 parts fluorinated silicone coupling agent, 11.5 parts polyurethane polymer microsphere adhesive, 9 parts transparent functional additive, 25 parts transparent diluent, 1.8 parts leveling agent, 1.5 parts wetting and dispersing agent, and 0.8 parts anti-agglomeration agent.

[0034] The fluorinated silicone coupling agent contains perfluorooctyltriethoxysilane in a mass ratio of 2:1 to γ-glycidyl etheroxypropyltrimethoxysilane; the polyurethane polymer microsphere adhesive is a functionally modified polyurethane microsphere selected from cross-linked polyurethane microspheres, polyurethane-acrylic core-shell microspheres, and surface-functionalized polyurethane microspheres; the transparent functional additives contain weather-resistant stabilizers, transparent toughening agents, and UV-resistant additives in a mass ratio of 2.5:2:1.5; and the transparent diluent contains ethyl acetate, anhydrous ethanol, and propylene glycol methyl ether in a mass ratio of 3.5:1.5:0.8.

[0035] Preparation process: S1. Add 25 parts of transparent diluent, 1.5 parts of wetting and dispersing agent, and 0.8 parts of anti-agglomeration agent to a high-speed disperser and stir at 900 rpm for 12 min at room temperature to obtain a transparent premix; S2. Add 42 parts of modified transparent polyurethane emulsion and 11.5 parts of polyurethane polymer microsphere binder, heat to 40℃, and stir at 1300 rpm for 25 min; S3. Cool to 28℃, slowly add 8.5 parts of compounded fluorinated silicone coupling agent, stir for 18 min, then add 9 parts of transparent functional agent and stir at 1000 rpm for 15 min; S4. Add 1.8 parts of leveling agent, stir at 700 rpm for 10 min, and filter to obtain the finished interface agent.

[0036] Construction process: Select PE transparent air cushion film, wipe and air dry with anhydrous ethanol, roll-coat interface agent, dry film thickness 10μm, cure at 50℃ for 3h to form a transparent interface layer, then coat with anti-ultraviolet and infrared heat insulation coating, and the finished product is obtained after curing.

[0037] Example 2

[0038] A special adhesive interface agent for transparent air cushion film, with the following raw material ratio by weight: 45 parts modified transparent polyurethane emulsion, 9 parts fluorinated silicone coupling agent, 12 parts polyurethane polymer microsphere adhesive, 9.5 parts transparent functional additive, 26 parts transparent diluent, 2.0 parts leveling agent, 1.8 parts wetting and dispersing agent, and 1.0 part anti-agglomeration agent.

[0039] The proportions of each group are the same as in Example 1, and the preparation and construction processes are the same as in Example 1, adapting to ETFE transparent air cushion film substrate.

[0040] Comparative Example 1

[0041] It is basically the same as Example 1, except that: the fluorinated silicone coupling agent is removed, an equal amount of modified transparent polyurethane emulsion is added, and there are no interfacial active modifying components.

[0042] Comparative Example 2

[0043] It is basically the same as Example 1, except that a single silane coupling agent is used instead of a compound fluorinated silane coupling agent, and there is no fluorine wetting modification component.

[0044] Comparative Example 3

[0045] It is basically the same as Example 1, except that the thickness of the interface agent film is 5 μm, which is lower than the optimal thickness range defined in this application.

[0046] Comparative Example 4

[0047] An anti-UV and infrared heat-insulating coating is directly applied to the surface of the ETFE transparent cushion film, without the need for interface agent pretreatment.

[0048] Comparative Example 5

[0049] The effect of directly coating the surface of the ETFE transparent cushion film with an interface agent containing an equal amount of polyurethane emulsion.

[0050] Performance Testing and Effect Analysis

[0051] All samples from the embodiments and comparative examples underwent uniform performance testing according to the following standards:

[0052] 1. Transmittance: The transmittance of visible light in the range of 400~760nm was measured using a transmittance meter;

[0053] 2. Adhesion: The adhesion pass rate of the coating was calculated using the 1mm×1mm cross-cut test.

[0054] 3. Abrasion resistance: After 500 cycles of reciprocating rubbing, observe the coating peeling.

[0055] 4. Aging resistance: After 1000 hours of xenon lamp aging, the coating peeling and lifting were tested, and the interface integrity rate was statistically analyzed.

[0056] 5. Interface delamination: Cycle the interface with high and low temperatures (-30℃~80℃) 50 times and observe whether delamination or peeling occurs.

[0057] Performance test results table

[0058] Example 1 93.2 98.5 No peeling, no wear 97.2 No layering, no peeling Example 2 93.8 97.8 No peeling, no wear 96.5 No layering, no peeling Comparative Example 1 91.5 82.3 Slight powder shedding, localized abrasion 83.1 Slight stratification Comparative Example 2 91.3 86.7 Localized wear 87.5 No obvious stratification Comparative Example 3 87.6 80.1 Slight peeling at the edges 72.3 Localized peeling Comparative Example 4 90.0 30.2 All detached and worn 10.6 All peeling Comparative Example 5 85.0 50.2 Large-area peeling and wear 40.1 Noticeable peeling and splitting

[0059] Beneficial effects of the invention

[0060] 1. Significantly improves interfacial adhesion and solves the problem of coating peeling: This application modifies the surface activity of the inert air cushion film substrate by using a fluorinated silicone composite binder. At the same time, the modified polyurethane emulsion and polyurethane polymer microsphere binder form a flexible transition interface, which can form a dual bonding mechanism of "physical interlocking + chemical bonding" with the substrate and heat insulation coating. Compared with the interface-free process, the coating adhesion is improved by more than 20%, and the friction resistance, high and low temperature resistance, and aging resistance are greatly optimized, completely solving the problems of coating peeling, delamination and peeling when used outdoors.

[0061] 2. Ultra-high light transmittance, preserving the original performance of the substrate: This interface agent uses a fully transparent raw material system with no filler obstruction. After film formation, the light transmittance is ≥90%. After coating, it does not change the high light transmittance, lightweight cushioning and moisture-proof performance of the transparent air cushion film. It is suitable for various high light transmittance application scenarios and makes up for the defects of traditional interface agents such as whitening and light blocking.

[0062] 3. Wide adaptability and strong compatibility: It can be perfectly adapted to the full range of transparent air cushion film substrates such as ETFE, PE, PP and EVA. At the same time, it is highly compatible with the UV protection and infrared heat insulation coatings that are matched with this application. There is no interface rejection, pinholes or orange peel phenomenon. It is suitable for various construction methods such as spraying, roller coating and scraping, and has strong process adaptability.

[0063] 4. Excellent weather resistance and long-term stability: The formula contains a compound of weather-resistant, UV-resistant and toughening functional components. The interface layer can withstand high and low temperature cycles of -30℃ to 80℃. It does not age or crack under long-term outdoor sunlight, and can ensure the sun protection and heat insulation effect of the functional coating for a long time, greatly extending the service life of the functional air cushion film and reducing the cost of use.

[0064] 5. Simple construction and low cost: No complex pretreatment processes such as grinding and corona treatment are required. The substrate can be cleaned and then applied. The curing method is flexible (constant temperature curing / room temperature air drying). The production efficiency is high, the raw material cost is low, and it can achieve large-scale mass production. It has extremely high market promotion value.

[0065] 6. Structural innovation and strong patent protection: This application is the first to develop a dedicated transparent interface transition system for low surface energy transparent air cushion films. Through the formulation design of fluorosilicone coupling compound, polyurethane polymer microsphere adhesive, and multifunctional additives, a unique adhesive interface is constructed. It is different from traditional general interface agents and belongs to the innovative process of functional upgrading of air cushion films. Its formulation combination, preparation method and construction process all have independent innovation and patent protection value. Any equivalent ratio fine adjustment or imitation of similar structure are within the scope of protection of this patent.

Claims

1. A special adhesion interface agent for transparent air cushion film, characterized in that, This product is compatible with ETFE, PE, PP, and EVA transparent cushion film substrates. It is used to connect the cushion film substrate with UV- and infrared-resistant functional coatings. By weight, the raw materials include: 35-55 parts modified transparent polyurethane emulsion, 5-12 parts fluorinated silicone coupling agent, 8-15 parts polyurethane polymer microsphere adhesive, 6-12 parts transparent functional additives, 20-30 parts transparent diluent, 0.8-3 parts leveling agent, 0.5-2.5 parts wetting and dispersing agent, and 0.3-1.5 parts anti-agglomeration agent. The modified transparent polyurethane emulsion is a hydroxyl-modified aliphatic polyurethane emulsion with a solid content of 42-48 wt%, a viscosity of 400-1000 mPa·s (23±1℃, 4# / 60rad), and a light transmittance of ≥92%. The fluorinated silicone coupling agent is a compound composition of perfluorooctyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, with a mass ratio of (1.5~2.5):

1. The polyurethane polymer microsphere adhesive is a functionally modified polyurethane microsphere, selected from at least one of cross-linked polyurethane microspheres, polyurethane-acrylic core-shell microspheres, and surface-functionalized polyurethane microspheres. The transparent functional additive is a compound composition of weather stabilizer, transparent toughening agent and anti-ultraviolet additive, with a mass ratio of (2~3):(1.5~2.5):(1~2).

2. The special adhesion interface agent for transparent air cushion film according to claim 1, characterized in that, By weight, the raw materials include: 40-48 parts of modified transparent polyurethane emulsion, 7-10 parts of fluorinated silicone coupling agent, 10-13 parts of polyurethane polymer microsphere binder, 8-10 parts of transparent functional additive, 22-28 parts of transparent diluent, 1.2-2.2 parts of leveling agent, 1-2 parts of wetting and dispersing agent, and 0.5-1.2 parts of anti-agglomeration agent.

3. The special adhesion interface agent for transparent air cushion film according to claim 1, characterized in that, The mass ratio of the modified transparent polyurethane emulsion, the fluorinated silicone coupling agent, and the polyurethane polymer microsphere adhesive is (42~45):(8~9):(11~12).

4. The special adhesion interface agent for transparent air cushion film according to claim 1, characterized in that, The transparent diluent is a compound system of ethyl acetate, anhydrous ethanol, and propylene glycol methyl ether, with a mass ratio of (3~4):(1~2):(0.5~1).

5. The special adhesion interface agent for transparent air cushion film according to claim 1, characterized in that, The leveling agent is a silicone transparent leveling agent BYK-333 (or a flexible leveling agent with similar performance), the wetting and dispersing agent is a nonionic transparent wetting agent, and the anti-agglomeration agent is a polyether transparent anti-agglomeration agent.

6. The method for preparing a special adhesion interface agent for transparent air cushion film as described in claim 1, characterized in that, The specific steps include: S1. Premixed solvent system: Add transparent diluent, wetting and dispersing agent, and anti-agglomeration agent to a high-speed disperser and stir at 800~1000rpm for 10~15min at room temperature to obtain a transparent solvent premix; S2. Base material mixing and modification: Add modified transparent polyurethane emulsion and polyurethane polymer microsphere binder to the premix liquid, heat to 35~45℃, stir at 1200~1400rpm for 20~30min to obtain a uniform transparent base material system. S3, Functional component compounding: Cool to 25~30℃, add fluorinated silicone coupling agent dropwise, keep warm and stir for 15~20min, then add transparent functional additive, stir at 900~1100rpm for 12~18min; S4. Leveling and refining: Add leveling agent, stir at low speed of 600~800rpm for 8~12min, and filter to obtain the finished interface agent.

7. The construction process of the special adhesive interface agent for transparent air cushion film as described in claim 1, characterized in that, The specific steps include: S1. Substrate pretreatment: Wipe the surface of the transparent air cushion film with anhydrous ethanol to remove oil and impurities, and air dry at room temperature for 5~10 minutes; S2. Interface agent coating: Apply the interface agent by spraying, rolling or scraping, and control the dry film thickness to 10~30μm; S3. Interface layer curing: Curing at 50~70℃ for 2~4 hours or air drying at room temperature for 20~24 hours to form a transparent interface transition layer. S4. Functional coating recoating: Apply an anti-ultraviolet and infrared functional coating to the surface of the cured interface layer, and cure it according to the corresponding process to complete product preparation.

8. The application of the special adhesive interface agent for transparent air cushion film according to any one of claims 1 to 7 in the functional modification of transparent air cushion film in the fields of packaging protection, building sunshade, outdoor products, and automotive interiors.

9. This invention significantly improves the adhesion of various functional coatings to the air cushion film substrate by coating a special adhesion interface agent as a transition layer, achieving interfacial compatibility and stable bonding between the air cushion film substrate and the functional coatings. This process provides a scalable technical path for the functional upgrading of transparent air cushion films: through the connection of the interface transition layer, long-term stable adhesion of various functional coatings such as UV protection and infrared protection can be achieved on the air cushion film without damaging its original light transmission and cushioning properties, effectively expanding the application scenarios of transparent air cushion films and improving the product's performance and added value.