GPE-PVC sealing rubber strip with double-layer structure and preparation process thereof

Abstract

The invention discloses a GPE-PVC sealing rubber strip with a double-layer structure, the sealing rubber strip comprises a core layer and a skin layer, the main component of the core layer is polyvinyl chloride (PVC), and the skin layer is of a double-layer structure and comprises a GPE layer and a PVC layer; the GPE layer mainly comprises the following raw materials: a composite polymer, a first plasticizer, metal aluminum electrolyte salt and aluminum alloy foil; the raw materials of the PVC layer mainly comprise PVC resin, a second plasticizer, a stabilizer and a coupling agent; the GPE layer is compounded with the PVC layer through a hot-pressing compounding process to form the GPE-PVC sealing rubber strip with a double-layer structure. The GPE is compounded with the liquid electrolyte through the polymer matrix to form a three-dimensional flexible network structure, hardening of PVC at low temperature and softening at high temperature can be inhibited, corrosion of the aluminum alloy frame can be inhibited through slow release of aluminum ions, and the service life of the sealing rubber strip and the service life of the aluminum alloy frame are prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of sealant strip preparation, and specifically to a GPE-PVC sealant strip with a double-layer structure and its preparation process. Background Art

[0002] PVC sealant strips are widely used in fields such as construction, automotive, and electronic and electrical. In the construction industry, they are used for window and door sealing, effectively preventing air and moisture penetration, improving thermal insulation and sound insulation effects, and are also used for building waterproofing and moisture-proofing as well as decorative materials; in the automotive field, they are used for interior and component sealing, ensuring the comfort of the vehicle and the normal operation of components; in the electronic and electrical field, they are used for insulation protection and electronic equipment sealing, enhancing the safety and reliability of the equipment.

[0003] These applications of PVC sealant strips benefit from their material properties, such as good processing performance, cost advantages, and performance tunability, and can be made into products of different shapes and sizes through extrusion, calendering, etc. to meet the needs of different fields. At the same time, with the development of technology, the formulations of PVC sealant strips have been continuously improved, the production processes have been optimized, and environmental protection requirements have promoted technological upgrades, resulting in the development of more environmentally friendly and higher-performance products. Summary of the Invention

[0004] The present application provides a GPE-PVC sealant strip with a double-layer structure and its preparation process. In this, GPE forms a three-dimensional flexible network structure through the composite of a polymer matrix and a liquid electrolyte, which can inhibit the hardening of PVC at low temperatures and the softening at high temperatures, maintaining the sealing performance of the PVC sealant strip at high and low temperatures; in addition, GPE is compounded on the surface of PVC, and the slow release of aluminum ions can inhibit the corrosion of the aluminum alloy frame, thereby enabling the GPE-PVC sealant strip to be applied to the sealing with the aluminum alloy frame and increasing the service life of the sealant strip and the aluminum alloy frame.

[0005] A GPE-PVC sealant strip with a double-layer structure provided by the present application, the sealant strip includes a core layer and a skin layer. The main component of the core layer is polyvinyl chloride (PVC), and the skin layer has a double-layer structure including a GPE layer and a PVC layer; the raw materials of the GPE layer mainly include a composite polymer, a first plasticizer, a metal aluminum electrolyte salt, and an aluminum alloy foil; the raw materials of the PVC layer mainly include PVC resin, a second plasticizer, a stabilizer, and a coupling agent; the GPE layer is compounded with the PVC layer through a hot pressing composite process to form a GPE-PVC sealant strip with a double-layer structure.

[0006] By adopting the above technical solution, the current PVC sealing strip has a temperature resistance range of -10°C to 60°C; therefore, the PVC sealing strip is not resistant to high and low temperatures. It will become hard and brittle in winter, and the sealing effect will deteriorate; in summer, it will become soft due to high temperature, and the sealing effect will also deteriorate. Among them, GPE is a polymer electrolyte system with a certain microstructure formed by a polymer matrix, a plasticizer, and an electrolyte salt. It is a material that combines the ionic conductivity of a liquid electrolyte and the mechanical stability of a solid polymer. By utilizing the high mechanical strength and flexibility of the gel polymer electrolyte, it can effectively prevent the leakage of the electrolyte and is widely used in batteries.

[0007] In this application, a sealing strip with a double-layer structure is formed by compounding GPE and PVC, which inhibits the hardening of PVC at low temperatures and the softening at high temperatures. In addition, GPE is compounded on the surface of PVC, and the slow release of aluminum ions can inhibit the corrosion of the aluminum alloy frame. Furthermore, the GPE-PVC sealing strip is applied to the sealing with the aluminum alloy frame, increasing the service life of the sealing strip. For example, it can be used as the sealing of aluminum alloy doors and windows, the sealing of automotive interiors, and the sealing of metal electronic devices.

[0008] Preferably, the composite polymer mainly includes a main polymer and a blend composite. The main polymer includes one or more of polyethylene oxide, polyvinylidene fluoride, and polyvinylidene fluoride-hexafluoropropylene; the blend composite is polymethyl methacrylate.

[0009] By adopting the above technical solution, in the preparation of the GPE layer, a polymer with ion conduction ability needs to be selected, and its polar groups (such as ether oxygen bonds) can coordinate with metal ions (Al 3+ ) However, due to the high charge density of Al 3+ , it is easy to form agglomerates in the polymer. Therefore, polymethyl methacrylate is added as a blend composite to the main polymer to reduce Al 3+ and reduce the ion mobility.

[0010] Preferably, the metal aluminum electrolyte salt is one or more of aluminum trifluoromethanesulfonate and aluminum trichloride.

[0011] By adopting the above technical solution, in this application, aluminum trifluoromethanesulfonate and aluminum trichloride are used as ion sources, and Al 3+

[0012] Preferably, the first plasticizer is propylene carbonate; the second plasticizer is dioctyl phthalate.

[0013] On the other hand, the present application discloses a preparation process of a GPE-PVC sealing strip with a double-layer structure, which is characterized by including the following preparation steps: preparation of the GPE layer, preparation of the PVC core layer and the PVC layer, and composite design of GPE-PVC.

[0014] Preferably, the preparation of the GPE layer includes the following operating steps: S1. Mix dilute hydrochloric acid and hydrofluoric acid in proportion to prepare an etching solution for standby. Take an aluminum alloy foil and soak it in the etching solution at a certain temperature. After water bath, perform ultrasonic treatment, then continue to rinse with deionized water, and dry in a vacuum drying oven for a certain time to obtain a pretreated aluminum alloy foil; S2. Mix the main polymer and the blend composite at a certain temperature to form a composite polymer; cool the composite polymer and grind it into a composite polymer powder, and heat and mix it with a metal aluminum electrolyte salt in an acetonitrile solution to obtain a transparent viscous liquid; add a first plasticizer during stirring, continue to stir for a certain time, then turn on vacuum degassing to remove bubbles, and finally immerse the pretreated aluminum alloy foil in the solution and let it stand for a certain time to obtain a GPE solution; S3. Pour the GPE solution onto a polytetrafluoroethylene substrate, scrape a wet film with a film scraper, let it stand at a certain temperature for a certain time to allow the solvent to naturally volatilize to a semi-solid state; transfer it to a freeze dryer, pre-freeze it at a certain temperature for a certain time, then evacuate, and sublime the residual solvent for a certain time to form a gel film of the GPE layer.

[0015] By adopting the above technical solution, the aluminum alloy foil is used in S1, and the specific surface area of the aluminum alloy is increased by chemical etching, thereby activating the surface of the aluminum alloy foil and making it have a microporous structure conducive to the release of Al 3+ and further promoting the subsequent dissolution and migration of Al 3+ . Then S2 realizes the complexation of the composite polymer and Al 3+ by the solvent method, and the plasticizer reduces the crystallinity. Finally, in step S3, the freeze-drying method is adopted to retain the porous structure, provide a transmission channel for Al 3+ , and at the same time form a cross-linked network structure.

[0016] Preferably, the preparation of the PVC core layer and the PVC layer includes the following operating steps: S1. Mix the PVC resin and a second plasticizer in an open mill at a certain temperature for a certain time, then add a stabilizer and a coupling agent and continue to mix for a certain time. Finally, put the mixture into a flat vulcanizing machine mold and hot press it at a certain temperature and atmospheric pressure for a certain time, and cool and demold to obtain a PVC sealing strip; the shape of the PVC sealing strip is determined by the flat vulcanizing machine mold;

[0017] S2. Place the PVC sealing strip on the sample stage of the plasma processor; turn on the oxygen plasma treatment to obtain the pretreated PVC sealing strip, which includes a PVC core layer and a plasma-treated PVC layer.

[0018] By adopting the above technical solution, stabilizers and coupling agents are added during the pretreatment of PVC to enhance the subsequent interfacial bonding force with GPE; and polar groups (-COOH, -OH) are introduced through plasma etching to strengthen the chemical bonding between PVC and GPE.

[0019] Preferably, the composite design of GPE-PVC includes the following operating steps: S1. Stack the gel film of the GPE layer on the plasma-treated PVC sealing strip, and place a polyimide isolation film on the other side of the gel film of the GPE layer; then put it into a hot press, heat up to a certain temperature, press to a certain pressure, then hold the pressure for a certain time, and naturally cool to room temperature, and peel off the polyimide isolation film to obtain a double-layer structured GPE-PVC sealing strip.

[0020] By adopting the above technical solution, the present application uses hot pressing to slightly melt the surface of PVC to form physical entanglement with GPE, and the pressure promotes the diffusion of interfacial molecules.

[0021] One or more technical solutions provided in the present application have at least the following technical effects or advantages:

[0022] 1. In the present application, GPE and PVC are compounded to form a sealing strip with a double-layer structure, in which GDP forms a three-dimensional flexible network structure on the surface of PVC, which can inhibit the hardening of PVC at low temperature and the softening at high temperature.

[0023] 2. In the present application, GPE is compounded on the surface of PVC, and the slow release of aluminum ions can inhibit the corrosion of the aluminum alloy frame, so that the GPE-PVC sealing strip can be applied to the sealing with the aluminum alloy frame, increasing the service life of the sealing strip, such as being used as the sealing of aluminum alloy doors and windows, the sealing of automotive interiors, and the sealing of metal electronic devices.

[0024] 3. In the preparation of the GPE layer in the present application, a polymer with ion conduction ability needs to be selected, and its polar groups (such as ether oxygen bonds) can coordinate with metal ions (Al 3+ )). However, due to the high charge density of Al 3+ , it is easy to form agglomerates in the polymer. Therefore, polymethyl methacrylate is added as a blend composite in the main polymer to reduce Al 3+ to reduce the ion mobility. Detailed implementation mode

[0025] The present application provides a GPE-PVC sealing strip with a double-layer structure and its preparation process. In the GPE, a three-dimensional flexible network structure is formed through the composite of a polymer matrix and a liquid electrolyte, which can inhibit the hardening of PVC at low temperatures and the softening of PVC at high temperatures, and maintain the sealing performance of the PVC sealing strip at high and low temperatures. In addition, the GPE is compounded on the surface of the PVC, and the slow release of aluminum ions can inhibit the corrosion of the aluminum alloy frame. Furthermore, the GPE-PVC sealing strip is applied to the sealing with the aluminum alloy frame, increasing the service life of the sealing strip and the aluminum alloy frame.

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or server including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or modules that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0028] Raw materials

[0029] Polyethylene oxide: CAS No. 25322-68-3, molecular weight 104.150;

[0030] Polyvinylidene fluoride: CAS No. 24937-79-9, molecular weight 64.034;

[0031] Polyvinylidene fluoride-hexafluoropropylene: CAS No. 9011-17-0, molecular weight, purity;

[0032] Polymethyl methacrylate: CAS No., molecular weight 667.495;

[0033] Aluminum trifluoromethanesulfonate: CAS No. 74974-61-1, molecular weight 474.189, purity 98%;

[0034] Aluminum chloride: CAS No. 7446-70-0, molecular weight 133.340;

[0035] Propylene carbonate: CAS No. 108 - 32 - 7, molecular weight 102.089, purity 98%;

[0036] Dioctyl phthalate: CAS No. 117 - 81 - 7, molecular weight 390.556.

[0037] Examples

[0038] Example 1

[0039] S1. Mix 5 wt% dilute hydrochloric acid and 2 wt% hydrofluoric acid to prepare an etching solution for standby. Take 6061 aluminum alloy foil (0.1 mm), soak it in the etching solution at a certain temperature, and perform ultrasonic treatment in a 25°C water bath for 10 min to remove the surface oxide layer. Then, immediately rinse it with deionized water 3 times and dry it in a vacuum drying oven at 60°C for 2 h to obtain a pretreated aluminum alloy foil;

[0040] S2. Mix polyethylene oxide and polymethyl methacrylate at 70°C with a mass ratio of 10:1 to form a composite polymer; cool the composite polymer and grind it into composite polymer powder; take the composite polymer powder and mix it with aluminum trifluoromethanesulfonate in a 45% acetonitrile solution and heat it to 60°C for 4 h to obtain a transparent viscous liquid; add the first plasticizer, propylene carbonate, during stirring and continue stirring for 1 h. Then, start vacuum degassing to remove bubbles for 30 min. Finally, immerse the pretreated aluminum alloy foil in the solution and let it stand for 24 h to obtain a GPE solution;

[0041] S3. Pour the GPE solution onto a polytetrafluoroethylene substrate, use a film - scraping machine to scrape a wet film with a thickness of 200 μm, and let it stand at 25°C for 2 h to allow the solvent to naturally volatilize to a semi - solid state; transfer it to a freeze - dryer, pre - freeze it at - 40°C for 4 h, then evacuate to 10 Pa and sublime the residual solvent for 12 h to form a gel film of the GPE layer.

[0042] S4. Take 100 parts by weight of PVC resin and 40 parts of dioctyl phthalate and knead them in an open mill at 160°C for 10 min. Then, add 3 parts by weight of a heat stabilizer (calcium - zinc complex) and 2 parts by weight of a coupling agent (KH - 550) and continue kneading for 5 min. Finally, put the mixture into a flat vulcanizer mold and hot - press it at 170°C and 10 MPa for 8 minutes, and cool and demold to obtain the pretreated PVC sealing strip. The shape of the PVC sealing strip is determined by the flat vulcanizer mold;

[0043] S5. Place the PVC sealing strip on the sample stage of the plasma processor; turn on the oxygen plasma treatment with oxygen (O2) as the gas; the power is 80 W; the treatment time is 3 minutes; the vacuum degree is 50 Pa, thereby obtaining the pretreated PVC sealing strip. The PVC sealing strip includes a PVC core layer and a plasma-treated PVC layer.

[0044] S6. Stack the gel film of the GPE layer on the plasma-treated PVC sealing strip, and place a polyimide separator film on the other side of the gel film of the GPE layer; then put it into a hot press, apply pressure to 5 MPa after reaching 90 °C, keep the pressure for 15 minutes, and then naturally cool to room temperature, and peel off the polyimide separator film to obtain a double-layer GPE-PVC sealing strip.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that in the step of S2, the main polymer used is polyvinylidene fluoride.

[0047] Example 3

[0048] The difference between Example 3 and Example 1 is that in the step of S2, the main polymer used is polyvinylidene fluoride-hexafluoropropylene.

[0049] Example 4

[0050] The difference between Example 3 and Example 1 is that in the step of S2, the metal aluminum electrolyte salt used is aluminum trichloride.

[0051] Comparative Example

[0052] Comparative Example 1

[0053] The difference between Comparative Example 1 and Example 1 is that a single-layer PVC sealing strip is used, and the gel film of the GPE layer is not laminated on the PVC sealing strip.

[0054] Performance Detection Test

[0055] To further study the influence of each component on the GPE-PVC sealing strip, the following examples are further carried out in this application for verification. In this application, the sealing strips prepared in Examples 1-4 and Comparative Example 1 are tested, and the tests include high and low temperature resistance detection, fatigue resistance detection and corrosion resistance detection.

[0056] 1. Detection of high and low temperature resistance: The test standard adopts the latest national standard GB / T24498-2025 "Sealing Strips for Building Doors, Windows and Curtain Walls" for detection. Cut 6 specimens from the sealing strip products. Before the test, measure the compression force and rebound recovery grade of 3 specimens. Place the other 3 specimens in the air at 23°C ± 2°C for 18h, then put the specimens into a low-temperature box at -20°C ± 2°C and freeze for 3h. Immediately take the specimens out of the low-temperature box and put them into a constant-temperature box at 50°C ± 2°C for 3h. This is 1 cycle, and the test time deviation is ±0.25h. After 4 repeated cycles, measure the rebound recovery, compression force, and calculate the change rate.

[0057] 2. Detection of fatigue resistance: The test standard adopts the latest national standard GB / T24498-2025 "Sealing Strips for Building Doors, Windows and Curtain Walls" for detection. Cut 6 specimens from the sealing strip products. Before the test, measure the compression force and rebound recovery grade of 3 specimens. Install the other 3 specimens on the fatigue testing machine and adjust the amplitude of the fatigue testing machine to the working range of the specimens. Test repeatedly, and the specimen frequency is (600 ± 30) times per hour. After the test, take down the specimens and place them in a standard temperature and humidity environment in a state where the horizontal direction is not pressurized and the working surface is upward for 24h, then measure the rebound recovery, compression force, and calculate the change rate.

[0058] 3. Detection of corrosion resistance: The test standard adopts GB / T10125 "Artificial Atmosphere Corrosion Test", and the reagents used in this test are above chemically pure. Cut 6 specimens from the sealing strip products. Before the test, measure the compression force and rebound recovery grade of 3 specimens; place the other 3 specimens in a salt spray chamber, and fix the sealing strip on an aluminum alloy frame. Dissolve sodium chloride in distilled water with a conductivity not higher than 20 μS / cm at a temperature of 25°C ± 2°C to prepare a solution with a concentration of 50g / L ± 5g / L. The concentration of the collected spray liquid should be 50g / L ± 5g / L, and at 25°C, the density of the prepared solution is in the range of 1.029 - 1.036. After the test, take down the specimens, measure the rebound recovery, compression force, and calculate the change rate. Similarly, take down the aluminum alloy frame in the test, rinse it 3 times with deionized water and dry it, then weigh it, and calculate the mass ratio by comparing its mass with the mass of the aluminum alloy frame before the test.

[0059] Organize the test data as shown in Table 1 below.

[0060] Table 1. Experimental Data Test Table

[0061]

[0062]

[0063] Data Analysis

[0064] Analysis was carried out between Comparative Example 1 and Example 1. The difference between Comparative Example 1 and Example 1 is that a single-layer PVC sealing strip was used, and the gel film of the GPE layer was not laminated on the PVC sealing strip. In terms of the detection and analysis of high and low temperature resistance performance, fatigue resistance performance, and corrosion resistance performance, the high and low temperature resistance performance of Example 1 is stronger than that of the sealing strip prepared in Comparative Example 1. This is because GDP forms a three-dimensional flexible network structure on the surface of PVC, which can inhibit the hardening of PVC at low temperatures and the softening at high temperatures. In addition, according to the analysis of the results of the fatigue resistance test, the gel film of the GPE layer on the PVC sealing strip does not affect the fatigue resistance of the sealing strip. In addition, according to the analysis of the corrosion resistance detection, it is obtained that the corrosion resistance effect of the sealing strip prepared in Example 1 is stronger than that of Comparative Example 1, and in the test, due to the GPE being compounded on the surface of PVC, the slow release of aluminum ions can inhibit the corrosion of the aluminum alloy frame. In the salt spray experiment, using the GPE-PVC sealing strip for the sealing with the aluminum alloy frame can inhibit the corrosion of the aluminum alloy frame in the salt spray.

[0065] Analysis was carried out among Examples 1-4. Among them, the selection of the main polymer and the selection of the metal aluminum electrolyte salt were different. Among them, through data analysis, Example 1 is the optimal example, that is, the main polymer is selected as polyethylene oxide, and the metal aluminum electrolyte salt is selected as aluminum trifluoromethanesulfonate. This is because polyethylene oxide, as a polymer with ion conduction ability, the polar groups on the polymer chain segments can coordinate with metal ions. Aluminum trifluoromethanesulfonate, as an ion source, releases Al 3+ , thereby effectively improving the application of the GPE-PVC sealing strip in the sealing with the aluminum alloy frame and increasing the service life of the sealing strip and the aluminum alloy frame.

[0066] It should be noted that the above sequence of the embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above specific embodiments of the present specification have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be executed in a different order from that in the embodiments and still achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0067] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0068] This specification is merely an exemplification of the present application and is considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalent technologies, the present application is intended to include these changes and modifications.

Claims

1. A GPE-PVC sealing strip with a double-layer structure, characterized in that, The sealant strip includes a core layer and a skin layer. The main component of the core layer is polyvinyl chloride (PVC), and the skin layer has a double-layer structure including a GPE layer and a PVC layer; The raw materials of the GPE layer mainly include a composite polymer, a first plasticizer, a metal aluminum electrolyte salt, and an aluminum alloy foil; The raw materials of the PVC layer mainly include PVC resin, a second plasticizer, a stabilizer, and a coupling agent; The GPE layer is compounded with the PVC layer through a hot pressing composite process to form a GPE-PVC sealant strip with a double-layer structure.

2. The GPE-PVC sealing strip with a double-layer structure according to claim 1, characterized in that, The composite polymer mainly includes a main polymer and a blend composite. The main polymer includes one or more of polyethylene oxide, polyvinylidene fluoride, and polyvinylidene fluoride-hexafluoropropylene; the blend composite is polymethyl methacrylate.

3. The GPE-PVC sealing strip with a double-layer structure as described in claim 1, characterized in that, The metal aluminum electrolyte salt is one or more of aluminum trifluoromethanesulfonate and aluminum trichloride.

4. The GPE-PVC sealing strip with a double-layer structure according to claim 1, characterized in that, The first plasticizer is propylene carbonate; the second plasticizer is dioctyl phthalate.

5. A preparation process of the GPE-PVC sealing strip with a double-layer structure as described in any one of claims 1-4, characterized in that, It includes the following preparation steps: preparation of the GPE layer, preparation of the PVC core layer and the PVC layer, and composite design of GPE-PVC.

6. The preparation process of the GPE-PVC sealing strip with a double-layer structure according to claim 5, characterized in that, The preparation of the GPE layer includes the following operating steps: S1. Mix dilute hydrochloric acid and hydrofluoric acid in a certain proportion to prepare an etching solution for standby. Take the aluminum alloy foil and soak it in the etching solution at a certain temperature. After water bath, perform ultrasonic treatment. Then continue to rinse with deionized water and dry in a vacuum drying oven for a certain time to obtain a pretreated aluminum alloy foil; S2. Mix the main polymer and the blend composite at a certain temperature to form a composite polymer; cool the composite polymer and grind it into a composite polymer powder. Then heat and mix it with the metal aluminum electrolyte salt in an acetonitrile solution to obtain a transparent viscous liquid; And add the first plasticizer during stirring, continue to stir for a certain time, then turn on vacuum degassing to remove bubbles. Finally, immerse the pretreated aluminum alloy foil in the solution and let it stand for a certain time to obtain a GPE solution; S3. Pour the GPE solution onto a polytetrafluoroethylene substrate, use a film scraping machine to scrape a wet film, and let it stand at a certain temperature for a certain time to allow the solvent to naturally volatilize to a semi-solid state; transfer it to a freeze dryer, pre-freeze it at a certain temperature for a certain time, and then evacuate to sublime the residual solvent for a certain time to form a gel film of the GPE layer.

7. The preparation process of the GPE-PVC sealing strip with a double-layer structure according to claim 6, characterized in that, The preparation of the PVC core layer and the PVC layer includes the following operating steps: S1. Knead the PVC resin and the second plasticizer in an open mill at a certain temperature for a certain time, then add the stabilizer and the coupling agent and continue to knead for a certain time. Finally, put the mixture into a flat vulcanizing machine mold and hot press it at a certain temperature and atmospheric pressure for a certain time, and cool and demold to obtain a PVC sealant strip; the shape of the PVC sealant strip is determined by the flat vulcanizing machine mold; S2. Place the PVC sealant strip on the sample stage of a plasma processor; turn on oxygen plasma treatment to obtain the pretreated PVC sealant strip, which includes a PVC core layer and a plasma-treated PVC layer.

8. The preparation process of the GPE-PVC sealing strip with a double-layer structure according to claim 7, characterized in that, The composite design of GPE-PVC includes the following operating steps: S1. Stack the gel film of the GPE layer on the plasma-treated PVC sealing strip, and place a polyimide separator film on the other side of the gel film of the GPE layer; then put it into a hot press, heat it to a certain temperature, press it to a certain pressure, then hold the pressure for a certain time, and naturally cool it to room temperature, and peel off the polyimide separator film to obtain a double-layer GPE-PVC sealing strip.

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