Anti-aging explosion-proof membrane adhesive with low initial adhesion, high stripping force and preparation method of anti-aging explosion-proof membrane adhesive

Abstract

The invention relates to the technical field of adhesives, in particular to an anti-aging explosion-proof membrane adhesive with low initial adhesion and high stripping force and a preparation method thereof. Comprising 38-42 parts of a soft monomer, 15-25 parts of a first hard monomer, 5-15 parts of a second hard monomer, 5-8 parts of a first functional monomer, 2-5 parts of a second functional monomer, 10-15 parts of resin and 0.1-1 part of an initiator. Through multi-dimensional performance optimization, soft monomer proportion reduction and functional hard monomer introduction, initial adhesion and release force regulation and control are realized, the technical problems of imbalance of initial adhesion and release force balance, insufficient damp-heat aging resistance, poor construction adaptability and the like are solved, and finally the construction convenience and long-term use reliability of the explosion-proof membrane are improved.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a low initial tack, high peel strength, aging resistant, and explosion-proof film adhesive and its preparation method. Background Technology

[0002] Mobile phone explosion-proof films are multi-layered composite screen protection devices, mainly used to buffer external impacts and prevent fragments from flying when the screen shatters. They typically include a protective film, a hardening layer, a PET film, an adhesive layer, and a release film. Camera module explosion-proof films are mainly used to prevent the lens from being scratched, cracked, or damaged by external impacts.

[0003] Explosion-proof films for mobile phones or camera modules primarily protect the screen by using a silicone buffer layer to disperse impact force, a special adhesive layer to hold glass fragments in place, and a PET film to absorb deformation energy. Existing technologies allow for improvements in the performance of mobile phone explosion-proof films by modifying the adhesive layer.

[0004] For example, in the Chinese patent with publication number CN105001813A, the initial tack is reduced by modifying the acrylic pressure-sensitive adhesive with organosilicon, but the peel strength decreases at the same time, resulting in the edges lifting or even falling off during long-term use.

[0005] For example, in the Chinese patent with publication number CN115806787A, although a low initial tack design is achieved by adjusting the monomer ratio, its ring initial tack still reaches 8N / inch. Moreover, the increase in the proportion of hard monomers makes the adhesive layer harder, which reduces the adhesion to the base film and exacerbates the risk of delamination. After long-term use in high temperature and high humidity environments (such as 60°C / 90%RH), problems such as adhesive layer degradation, yellowing, residual adhesive, and a significant decrease in peel strength (the decrease can reach 30%~50%) are likely to occur.

[0006] For example, in Chinese patent CN114106709A, the disclosed optical adhesive for explosion-proof film has basic bonding properties, but its adhesion is only 2150-2350g / 25mm. Moreover, it does not clearly address the control of initial adhesion and the design for performance stability under extreme environments, which leads to fluctuations in peel force, residual adhesive, or delamination under high temperature and high humidity conditions. On curved (3D) glass surfaces, it is prone to defects such as edge lifting, delamination, and poor bubble removal.

[0007] For example, in the Chinese patent with publication number CN115491141B, although the performance was improved by adding tackifying resin and coupling agent, the problems of high initial tack and insufficient long-term aging resistance were still not solved.

[0008] It can be seen that the initial adhesion and peel force of the explosion-proof film for mobile phone back cover or camera module in the existing technology are difficult to balance: traditional explosion-proof film often has too high initial adhesion in pursuit of high peel force, and it is difficult to adjust the position when the adhesion is not good, which affects the operating efficiency and yield. At the same time, the aging resistance is insufficient, and there are also problems such as poor adhesion between the adhesive layer and the substrate and poor adhesion to the substrate.

[0009] To address the aforementioned problems, this invention provides a low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive and its preparation method. Summary of the Invention

[0010] The purpose of this invention is to provide a low initial tack, high peel strength, aging resistant explosion-proof film adhesive and its preparation method, so as to solve the problems mentioned in the background art.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a low initial tack, high peel strength, aging-resistant explosion-proof film adhesive, comprising the following substances by weight: 38-42 parts of soft monomer, 15-25 parts of hard monomer I, 5-15 parts of hard monomer II, 5-8 parts of functional monomer I, 2-5 parts of functional monomer II, 10-15 parts of resin, 0.1-1 part of initiator; 150-300 parts of solvent.

[0012] The prepared adhesive has an initial tack of ≤100g / 25mm, an annular initial tack of ≤600g / 25mm, and a peel strength of >2000g / 25mm.

[0013] Ideally, the soft monomer is one of butyl acrylate (BA), isooctyl acrylate, ethyl acrylate, and butyl acrylate.

[0014] More optimally, hard monomer one is one of methyl methacrylate (MMA), styrene, and maleic anhydride, and hard monomer two is one of methacrylic acid (MA), methyl acrylate, vinyl chloride, and vinyl acetate.

[0015] More optimally, functional monomer one is one of hydroxyethyl acrylate (HEMA), acrylamide, or N-hydroxymethylacrylamide, and functional monomer two is one of methacrylic acid (AA), hydroxyethyl methacrylate, itaconic acid, or diacetone acrylamide.

[0016] In a more optimized manner, the resin is a rosin-modified resin, which in this invention is a rosin-modified phenolic resin, a rosin-modified maleic acid resin, or a rosin-modified pentaerythritol ester; the initiator is azobisisobutyronitrile (AIBN); and the solvent is ethyl acetate.

[0017] This invention provides a method for preparing a low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive, comprising the following steps: S1. Add one-third of the soft monomer, hard monomer I, hard monomer II, functional monomer I, and functional monomer II to the reaction vessel with ethyl acetate and mix thoroughly to form a monomer mixed solution. Heat to 65~70℃, purge with N2 for 10 min, add half of the initiator, and react with the initiator for 1.5 h. Then, add the remaining two-thirds of the monomer in two portions to the reaction vessel, reacting for 30 min each time.

[0018] S2: After the last addition of the monomer mixture, add the other half of the initiator, control the dropping rate at 1 part / min, keep warm for 4 hours, and continuously introduce N2 during this process to obtain an acrylate copolymer solution with a solid content of 40%. S3: Add rosin-modified resin and continue stirring for 1 hour until completely dissolved to obtain the adhesive.

[0019] This invention provides a low initial tack, high peel strength, aging resistant explosion-proof film, containing any of the above-mentioned low initial tack, high peel strength, aging resistant explosion-proof film adhesives, including a substrate, an adhesive layer, and a release film. The substrate is 50µm optical PET, and the release film thickness is 125µm. The adhesive layer, based on the amount of adhesive used, also includes the following percentage substances: Isocyanate curing agent 0.6~0.8%, tetrafunctional epoxy curing agent 0.3~0.4%, coupling agent 0.6%, UV absorber 0.4%, leveling agent 0.3%; The resulting explosion-proof film has a light transmittance of >90% and a haze of <2%.

[0020] More optimally, the coupling agent is the epoxy silane coupling agent KH560 (γ-glycidoxypropyltrimethoxysilane).

[0021] In a more optimized manner, the UV absorber is Timuvi 400 light stabilizer; the leveling agent is BYK378.

[0022] This invention also provides a method for preparing a low initial tack, high peel strength, aging-resistant, and explosion-proof film, comprising the following steps: The obtained adhesive was placed on a three-roll mill for more than 2 hours to fully mix the coating liquid. It was then coated on the substrate using a comma-shaped doctor blade. The dry adhesive thickness was 25±2um. The drying temperature was 110℃ / 3min. A 125um release film was then laminated and cured at 40℃ for 3D to obtain the finished explosion-proof film.

[0023] This invention aims to address technical challenges such as imbalance between initial tack and peel force, insufficient resistance to damp heat aging, and poor construction adaptability through multi-dimensional performance optimization, ultimately improving the ease of construction and long-term reliability of explosion-proof films. Based on the aforementioned technical deficiencies, the specific objectives of this invention are broken down into two key dimensions: adhesive formulation and coating formulation.

[0024] In the formulation of adhesives, this invention adjusts the monomer composition. In traditional formulations, to control the balance of initial tack, cohesive strength, and aging resistance, a high proportion of soft monomers (such as butyl acrylate, BA) is often used to ensure tack, but this results in excessively high initial tack. In this invention, by reducing the proportion of soft monomers and introducing functional hard monomers, the control of initial tack and peel strength is achieved.

[0025] In the coating formulation, the present invention improves the crosslinking density by increasing the amount of crosslinking agent and using multifunctional crosslinking agents.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention adds butyl acrylate (BA) as a soft monomer, which can adjust the flowability of molecular chain segments to achieve initial contact tackiness; it adds methyl methacrylate (MMA) and methacrylic acid (MA) as hard monomers, which can increase the glass transition temperature of the polymer and enhance cohesive strength, while inhibiting the rapid wetting of molecular chains to the surface of the adherend through steric hindrance; it also introduces hydroxyethyl acrylate (HEMA) and methacrylic acid (AA) as functional monomers, which provide crosslinking reaction sites through hydroxyl (-OH) and carboxyl (-COOH) groups, laying the foundation for subsequent improvement of crosslinking density; in addition, this invention uses rosin-modified resin, which significantly improves yellowing resistance and damp heat resistance while ensuring tackification effect.

[0027] This invention increases the amount of crosslinking agent (such as isocyanate) in the formulation to 0.8%, thereby inhibiting molecular chain slippage and improving cohesive strength through more crosslinking points. This invention also uses a combination of isocyanate and epoxy curing agents, where the isocyanate provides a rapid crosslinking reaction, and the epoxy curing agent provides slow curing, further increasing the crosslinking density. Furthermore, this invention reduces the proportion of soft monomers and introduces functional monomers, thereby minimizing the attenuation of peel strength and simultaneously achieving control over initial tack and peel strength.

[0028] The epoxy silane coupling agent KH560 selected in this invention undergoes a ring-opening reaction due to nucleophilic attack by carboxyl groups, forming a stable ester bond. Its methoxy group (-OCH3) undergoes a stepwise hydrolysis reaction to generate a highly active silanol group (-Si-OH), which condenses with -OH on the substrate surface to form a stable (-Si-O-) bond. The adhesive and the substrate form a stable covalent bond (Si-O-Si), constructing a "substrate-coupling agent-adhesive" bridging structure. This transforms the originally weak interfacial physical adsorption into a stronger chemical covalent bond interaction, thereby significantly improving the interfacial bonding strength.

[0029] The Timuvi 400 light stabilizer selected in this invention contains a specific chromophore (hydroxyphenyltriazine structure) in its molecular structure, which can efficiently absorb ultraviolet rays in the 280-400nm wavelength band. After absorbing energy, it transitions from the ground state to the excited state, and then converts the high-energy ultraviolet rays into low-energy heat energy (harmless form) and releases it into the environment through intramolecular vibration, rotation and other means. It then returns to the stable ground state, realizing a cycle and effectively improving the aging resistance of the adhesive.

[0030] This invention selects BYK378 as a leveling agent, which has low surface energy siloxane segments. When added to coatings and other systems, it quickly migrates to the surface of the system and aligns in an oriented manner, rapidly reducing the surface tension of the adhesive system. This allows the coating to better wet the substrate and prevent defects such as pinholes.

[0031] The adhesive prepared by this invention has low initial tack and high peel strength: through monomer ratio optimization (synergistic effect of BA / MMA / AA / MA), it achieves initial tack ≤100g / 25mm (probe), ring initial tack ≤600g / 25mm (ring initial), and peel strength >2000g / 25mm (glue), which facilitates adhesion and adjustment and ensures a firm bond.

[0032] The explosion-proof film prepared by this invention has excellent aging resistance: after aging test at 65℃ / 90%RH for 240h, there is no residue, no yellowing, no edge curling, and the peel strength retention rate is >90%.

[0033] The solution of the present invention has good coating adaptability: the addition of leveling agent and silane coupling agent significantly improves coating uniformity and adhesive adhesion, avoiding defects such as orange peel and fish eyes.

[0034] The explosion-proof film prepared by this invention is suitable for 3D curved surface structures: the adhesive layer has good flexibility and strong adhesion, and the fixed load is ≤2mm, making it especially suitable for the curved surface attachment of mobile phone 3D back covers and camera modules.

[0035] The explosion-proof film prepared by this invention has high light transmittance and low haze: light transmittance >90% and haze <2%, which does not affect camera imaging or the aesthetics of the back cover. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The performance of the prepared explosion-proof film was verified through several embodiments and comparative examples. Example 1

[0038] The monomer formulation for the glue synthesis (parts by weight) is as follows: BA 42 parts, MMA 20 parts, MA 10 parts, HEMA 6 parts, AA 3 parts; rosin-modified phenolic resin type 210 added 10 parts; AIBN 0.4 parts; ethyl acetate 1.2 times the total mass of monomers; synthesis temperature 70℃, reaction time 7 hours, to obtain the glue synthesis solution.

[0039] Coating formulation (based on the mass percentage of the adhesive compound): 0.8% isocyanate BI7963, 0.3% tetrafunctional epoxy curing agent M-241, 0.6% KH560, 0.4% Timuvi400, and 0.3% BYK378. The preparation method is as follows: Mix the components according to the mass ratio, and place on a three-roll mill for at least 2 hours to ensure thorough and uniform mixing. Use 50µm optical PET as the substrate. Coat a sample with a dry adhesive thickness of 25±2µm using a comma-shaped doctor blade. Dry at 110℃ for 3 minutes. Lay a 125µm release film, and cure at 40℃ for 3D to obtain the finished explosion-proof film. Example 2

[0040] The monomer formulation for the glue synthesis is as follows: 38 parts BA, 25 parts MMA, 8 parts MA, 7 parts HEMA, and 4 parts AA; 10 parts of rosin-modified phenolic resin type 210; 0.4 parts of AIBN; and 1.2 times the total mass of the monomers. The synthesis temperature is 70℃, and the reaction time is 7 hours to obtain the glue synthesis solution.

[0041] Coating formulation (based on the mass percentage of the adhesive compound): 0.8% isocyanate BI7963, 0.3% tetrafunctional epoxy curing agent M-241, 0.6% KH560, 0.4% Timuvi400, and 0.3% BYK378. The preparation method is as follows: Mix the components according to the mass ratio, and place on a three-roll mill for at least 2 hours to ensure thorough and uniform mixing. Use 50µm optical PET as the substrate. Coat a sample with a dry adhesive thickness of 25±2µm using a comma-shaped doctor blade. Dry at 110℃ for 3 minutes. Lay a 125µm release film, and cure at 40℃ for 3D to obtain the finished explosion-proof film. Example 3

[0042] The monomer formulation for the glue synthesis is as follows: BA 42 parts, MMA 20 parts, MA 10 parts, HEMA 6 parts, AA 3 parts; rosin-modified phenolic resin type 210 added 10 parts; AIBN 0.4 parts; ethyl acetate 1.2 times the total mass of monomers; synthesis temperature 70℃, reaction time 7 hours, to obtain the glue synthesis solution.

[0043] Coating formulation (based on the mass percentage of the adhesive compound): 0.6% isocyanate BI7963, 0.4% tetrafunctional epoxy curing agent M-241; 0.6% KH560, 0.4% Timuvi400, and 0.3% BYK378. The preparation method is as follows: Mix the components according to the mass ratio, place on a three-roll mill for at least 2 hours to ensure thorough and uniform mixing. Use 50µm optical PET as the substrate. Coat a sample with a dry adhesive thickness of 25±2µm using a comma-shaped doctor blade. Dry at 110℃ for 3 minutes. Lay a 125µm release film, and cure at 40℃ for 3D to obtain the finished explosion-proof film. Comparative Example 1

[0044] The monomer formulation for the glue synthesis is as follows: 54 parts BA, 20 parts MMA, 10 parts MA, 6 parts HEMA, 3 parts AA, 10 parts rosin-modified phenolic resin type 210, 0.4 parts AIBN, and 1.2 times the total mass of the monomers. The synthesis temperature is 70℃ and the reaction time is 7 hours to obtain the glue synthesis solution.

[0045] Coating formulation (based on the mass percentage of the adhesive compound): 0.8% isocyanate BI7963, 0.3% tetrafunctional epoxy curing agent M-241, 0.6% KH560, 0.4% Timuvi400, and 0.3% BYK378. The preparation method is as follows: Mix the components according to the mass ratio, and place on a three-roll mill for at least 2 hours to ensure thorough and uniform mixing. Use 50µm optical PET as the substrate. Coat a sample with a dry adhesive thickness of 25±2µm using a comma-shaped doctor blade. Dry at 110℃ for 3 minutes. Lay a 125µm release film, and cure at 40℃ for 3D to obtain the finished explosion-proof film. Comparative Example 2

[0046] The monomer formulation for the glue synthesis is as follows: 42 parts BA, 20 parts MMA, 10 parts MA, 6 parts HEMA, and 3 parts AA; 0.4 parts AIBN; 1.2 times the total mass of the monomers; the synthesis temperature is 70℃, and the reaction time is 7 hours to obtain the glue synthesis solution.

[0047] Coating formulation (based on the mass percentage of the adhesive compound): 0.8% isocyanate BI7963, 0.3% tetrafunctional epoxy curing agent M-241, 0.4% Timuvi400, and 0.3% BYK378. The preparation method is as follows: Mix the components according to the mass ratio, place on a three-roll mill for at least 2 hours to ensure thorough and uniform mixing. Use 50µm optical PET as the substrate. Apply the adhesive to a sample with a dry adhesive thickness of 25±2µm using a comma-shaped doctor blade. Dry at 110℃ for 3 minutes. Lay a 125µm release film and cure at 40℃ for 3D.

[0048] The adhesives and explosion-proof films prepared in several embodiments and comparative examples were subjected to performance tests, and the test results are shown in Table 1.

[0049] Peel strength test standard reference: GB / T 2792-2014.

[0050] Reference standard for constant load test: In an environment of 25±1℃ and relative humidity of 50±5%, the test plate with the sample attached is suspended at 90° on the test frame, and a 200g weight is suspended at the lower end. The amount of displacement of the sample after a certain period of time or the time it takes for the sample to completely detach is used to characterize the anti-warping ability of the adhesive tape.

[0051] Probe testing standard reference: ASTM D6195-18.

[0052] Reference standard for initial ring test: GB / T 31125-2014.

[0053] For haze and transmittance testing standards, refer to ASTM D1003-21.

[0054] Table 1. Performance test results of adhesives and explosion-proof films in each embodiment and comparative example. project Peeling force Fixed load probe Huanchu Haze Light transmittance Peel strength at 65℃ / 90% for 240 hours Residual glue unit gf / 25mm mm gf / 25mm gf / 25mm % % gf / 25mm / Example 1 2350 1.2 65 460 1.43 90.5 2312 No residue Example 2 2210 2 49 445 1.39 90.6 2140 No residue Example 3 2150 4 70 525 1.25 90.2 2035 No residue Comparative Example 1 2520 11 72 527 1.65 90.4 2243 Residual glue Comparative Example 2 1950 15 64 479 1.57 90.4 1874 Points of Incompleteness As shown in Table 2, in Comparative Example 1, the proportion of soft monomers was relatively high. The probe test and ring test results indicate that the initial tack of the explosion-proof film was high, but the peel strength at 65℃ / 90% humidity for 240 hours showed the greatest decrease. Therefore, its performance retention under high temperature and high humidity conditions was weak, and residual adhesive remained. In Example 3, the probe and ring test data were similar to those of Comparative Example 1, indicating that the explosion-proof film of the present invention, while reducing the proportion of soft monomers, could achieve the same level of initial tack, while also having lower haze. Furthermore, Example 3 showed a smaller decrease in peel strength at 65℃ / 90% humidity for 240 hours, good performance retention under high temperature and high humidity conditions, and no residual adhesive, demonstrating excellent reworkability. Example 3 significantly outperformed Comparative Example 1 in these two aspects.

[0055] In Comparative Example 2, no rosin-modified resin was added, resulting in lower peel strength and residual adhesive. However, the explosion-proof film prepared using the technical solution described in the examples exhibits significantly improved peel strength, initial tack, and weather resistance. This effectively solves the problems of existing explosion-proof films, such as high initial tack leading to rework difficulties, poor air bubble removal, low peel strength, and significant reduction in peel strength, delamination, and poor adhesion to curved surfaces after long-term use in high-temperature and high-humidity environments.

[0056] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive, characterized in that, By weight, it includes the following substances: 38-42 parts of soft monomer, 15-25 parts of hard monomer I, 5-15 parts of hard monomer II, 5-8 parts of functional monomer I, 2-5 parts of functional monomer II, 10-15 parts of resin, 0.1-1 part of initiator; 150-300 parts of solvent. The prepared adhesive has an initial tack of ≤100g / 25mm, an annular initial tack of ≤600g / 25mm, and a peel strength of >2000g / 25mm.

2. The low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive according to claim 1, characterized in that: The soft monomer is one of butyl acrylate, isooctyl acrylate, ethyl acrylate, and butyl acrylate.

3. The low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive according to claim 1, characterized in that: The first hard monomer is one of methyl methacrylate, styrene, and maleic anhydride, and the second hard monomer is one of methacrylic acid, methyl acrylate, vinyl chloride, and vinyl acetate.

4. The low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive according to claim 1, characterized in that: The first functional monomer is one of hydroxyethyl acrylate, acrylamide, or N-hydroxymethylacrylamide, and the second functional monomer is one of methacrylic acid, hydroxyethyl methacrylate, itaconic acid, or diacetone acrylamide.

5. The low initial tack, high peel strength, aging-resistant, explosion-proof film adhesive according to claim 1, characterized in that: The resin is a rosin-modified resin; the initiator is azobisisobutyronitrile; and the solvent is ethyl acetate.

6. A method for preparing a low initial tack, high peel strength, aging-resistant explosion-proof film adhesive, used to prepare the low initial tack, high peel strength, aging-resistant explosion-proof film adhesive as described in claims 1-5, characterized in that, Includes the following steps: S1 Add one-third of the soft monomer, hard monomer one, hard monomer two, functional monomer one, functional monomer two and ethyl acetate to the reaction vessel and mix evenly to form a monomer mixed solution. Heat to 65~70℃, introduce N2 for protection for 10min, add half of the initiator, react with the initiator for 1.5h, then add the remaining two-thirds of the monomer in two portions to the reaction vessel, reacting for 30min each time. S2: After the last addition of the monomer mixture, add the other half of the initiator, control the dropping rate at 1 part / min, keep warm for 4 hours, and continuously introduce N2 during this process to obtain an acrylate copolymer solution with a solid content of 40%. S3: Add rosin-modified resin and continue stirring for 1 hour until completely dissolved to obtain the adhesive.

7. A low initial tack, high peel strength, aging-resistant explosion-proof film, comprising the low initial tack, high peel strength, aging-resistant explosion-proof film adhesive as described in claims 1-5, including a substrate, an adhesive layer, and a release film, wherein the substrate is 50µm optical PET, and the release film thickness is 125µm, characterized in that: The adhesive layer, based on the amount of adhesive used, also includes the following percentage substances: Isocyanate curing agent 0.6~0.8%, tetrafunctional epoxy curing agent 0.3~0.4%, coupling agent 0.6%, UV absorber 0.4%, leveling agent 0.3%; The resulting explosion-proof film has a light transmittance of >90% and a haze of <2%.

8. The low initial tack, high peel strength, aging-resistant explosion-proof film according to claim 7, characterized in that: The coupling agent is epoxy silane coupling agent KH560 (γ-glycidoxypropyltrimethoxysilane).

9. The low initial tack, high peel strength, aging-resistant explosion-proof film according to claim 7, characterized in that: The ultraviolet absorber is Timuvi 400 light stabilizer; the leveling agent is BYK378.

10. A method for preparing a low initial tack, high peel strength, aging-resistant, explosion-proof film, characterized in that, Includes the following steps: The obtained adhesive was placed on a three-roll mill for more than 2 hours to fully mix the coating liquid. It was then coated on the substrate using a comma-shaped doctor blade. The dry adhesive thickness was 25±2um. The drying temperature was 110℃ / 3min. A 125um release film was then laminated and cured at 40℃ for 3D to obtain the finished explosion-proof film.