Formula and processing method of rubber sealing film for preparing composite material

Abstract

The invention provides a formula and a processing method of a rubber sealing film for preparing a composite material. The rubber sealing film for preparing the composite material comprises the following components in parts by weight: 50-70 parts of high phenyl silicone rubber, 20-30 parts of medium phenyl silicone rubber, 10-20 parts of fluorinated silicone rubber, 5-10 parts of a high-temperature internal release agent, 10-20 parts of white carbon black, 2-5 parts of aramid short fibers, 3-5 parts of a structure regulator, 0.5-5 parts of an accelerant, 1.0-3.0 parts of a vulcanizing agent and 1 part of zinc stearate. The mechanical property, ablation resistance and high temperature resistance of the crosslinked rubber sealing film can be greatly improved, and the thickness of the rubber sealing film can be accurately controlled to be not higher than 0.5 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer products, and particularly relates to a formula and a processing method for preparing a rubber sealing film for composite materials. Background Art

[0002] Composite materials are the fastest-growing sector in the materials industry today. Due to their widespread applications in automotive, construction, aviation, aerospace, marine, and rail vehicles, the requirements for their preparation are becoming increasingly stringent. The latest composite molding technology requires a sealed environment above 300°C during the molding process. Existing rubber sealing films cannot meet the required thickness (under 0.5 mm), ablation resistance, and high-temperature resistance. This is particularly true for thicknesses under 0.5 mm. Due to limitations in material formulation and processing, mature rubber sealing films for composite materials have not yet been developed.

[0003] CN200810050060.9 provides a corrosion-resistant composite rubber sealing membrane. It consists of an inner rubber membrane and an outer rubber membrane. The inner rubber membrane is a corrosion-resistant and corrosion-resistant layer that contacts the medium within the gasholder. The outer rubber membrane is a pressure-bearing layer that contacts the atmosphere and is reinforced with multiple layers of woven fabric. The number of woven fabric layers and the thickness of the outer rubber membrane can be adjusted according to the actual pressure of the gasholder. This invention addresses the problems of existing rubber sealing membranes, such as low corrosion resistance and short lifespan when storing corrosive gas media, as well as the high cost and low strength of special rubber sealing membranes. This invention expands and extends the application range and service life of sealing membrane gasholders.

[0004] CN200710158833.0 relates to a method for producing a rubber sealing membrane. Specifically, it relates to a method for producing a rubber sealing membrane for a rolling curtain dry gas holder. This invention provides a method for producing a rubber sealing membrane with a simple production process and a long service life. The key points of the invention are the use of a three-phase braided skeleton material, adhesive treatment, single-stage calendering and vulcanization, and then hot pressing to form the membrane.

[0005] CN202210005191.5 invented a fiber cloth reinforced sealing diaphragm that can better withstand medium pressure, wear resistance and mechanical dynamics.

[0006] Existing technologies similar to the present invention are all improved by rubber structure and fiber reinforcement technology, and no overall formula design is made for the high temperature resistance and mechanical properties of the rubber sealing membrane. In addition, the key parameters of the sealing requirements of temperature resistance above 300°C and thickness below 0.5 mm in the preparation process of the new composite material are not involved. Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a rubber sealing film for preparing composite materials. Through the high-temperature resistant rubber formula and hot platform spin coating process design, the high-temperature resistance and mechanical properties of the cross-linked rubber sealing film can be greatly improved, and at the same time, the product thickness can be precisely controlled to less than 0.5 mm.

[0008] To achieve this object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a rubber sealing film for preparing a composite material, wherein the rubber sealing film formula components include, by weight: 50-70 parts of high-phenyl silicone rubber, 20-30 parts of medium-phenyl silicone rubber, 10-20 parts of fluorosilicone rubber, 5-10 parts of high-temperature internal release agent, 10-20 parts of white carbon black, 2-5 parts of aramid staple fiber, 3-5 parts of structural regulator, 0.5-5 parts of accelerator, 1.0-3.0 parts of vulcanizing agent and 1 part of zinc stearate.

[0009] As a preferred technical solution of the present invention, the high-phenyl silicone rubber used in the present invention is a siloxane and methylphenylsiloxane polymer containing phenyl content ≥40% in the main chain.

[0010] As a preferred technical solution of the present invention, the phenyl silicone rubber used in the present invention is a siloxane and methylphenylsiloxane polymer containing 20% ​​to 40% phenyl content in the main chain.

[0011] As a preferred technical solution of the present invention, the fluorosilicone rubber used in the present invention is γ-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane.

[0012] As a preferred technical solution of the present invention, the high-temperature internal mold release agent employed is a mixture of low-molecular-weight phenyl silicone rubber and boron carbide in a weight ratio of 10:1. Added to the rubber matrix, this additive forms a durable, high-quality boronized film on the surface of the high-temperature material, thereby providing a mold release effect and facilitating the preparation of rubber sealing films.

[0013] As a preferred technical solution of the present invention, the white carbon black used in the present invention is hydrated silicon dioxide prepared by a gas phase method, with a brand name of A380.

[0014] As the preferred technical solution of the present invention, the aramid staple fiber used in the present invention is a synthetic fiber with high temperature resistance. It can be used for more than 10 years at 220 degrees and will not decompose or melt at a temperature of 560 degrees. The brand is: 1414.

[0015] As a preferred technical solution of the present invention, the structure regulator used in the present invention is polytrifluoropropyl hydroxysiloxane. The main function of the structure regulator is to form a network structure between the silicone rubber matrix and white carbon black, thereby further improving the mechanical properties.

[0016] As a preferred technical solution of the present invention, the accelerator used in the present invention is triallyl isocyanurate (accelerator TAIC).

[0017] As a preferred technical solution of the present invention, the vulcanizing agent used in the present invention is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5).

[0018] The zinc stearate used in the present invention is a product of Xilong Science Co., Ltd., and its grade is analytically pure (AR).

[0019] In a second aspect, the present invention provides a method for preparing the above-mentioned rubber sealing film for composite materials, the processing method specifically comprising the following steps: S1, mixing high phenyl silicone rubber, medium phenyl silicone rubber and fluorosilicone rubber in ethyl acetate to obtain a sealing film glue solution; S2, mixing the sealing film glue obtained in S1 with a high-temperature internal mold release agent, white carbon black, aramid staple fiber, a structure regulator, an accelerator, a vulcanizing agent, and zinc stearate to obtain a sealing film mixed glue; S3, spin coating and vulcanizing the sealing film mixed rubber obtained in S2 to obtain a rubber sealing film.

[0020] As a preferred technical solution of the present invention, the above processing steps are specifically as follows: S1. Mix 50-70 parts of high-phenyl silicone rubber, 20-30 parts of medium-phenyl silicone rubber, 10-20 parts of fluorosilicone rubber and 100 parts of ethyl acetate in a reactor at a mixing temperature of 30-50° C., a stirring paddle speed of 20-40 rpm, and a mixing time of 10-30 minutes to obtain a sealing film adhesive solution; S2, mixing the sealing film glue obtained in step S1 with 5-10 parts of a high-temperature internal release agent, 10-20 parts of white carbon black, 2-5 parts of aramid staple fibers, 3-5 parts of a structure regulator, 0.5-5 parts of an accelerator, 1.0-3.0 parts of a vulcanizing agent, and 1 part of zinc stearate in a reactor at a mixing temperature of 25-70° C., a stirring paddle speed of 20-40 rpm, and a mixing time of 30-60 minutes to obtain a sealing film mixed glue; S3. The sealing film mixed glue obtained in step S2 is spin-coated and vulcanized on a rotating hot platform at a platform temperature of 150-200° C. for 120-300 minutes to obtain a rubber sealing film.

[0021] In a third aspect, the rubber sealing film of the present invention is used in preparing a composite material.

[0022] The reactor used in the present invention is a general rubber synthesis equipment. The operating temperature control range of the reactor is 25~350℃, and the stirring blade speed control range is 20~120 rpm. The specific model is not limited as long as the equipment meets the safety requirements and can fully dissolve and evenly mix the rubber, filler and additives.

[0023] The rotary hot platform used in the present invention is a special customized device for spin coating to prepare rubber films. The rotary hot platform can operate in a temperature control range of 100~300℃ and a rotation speed of 20 rpm. The specific model is not limited as long as the equipment meets the safety requirements and can form the product.

[0024] Through targeted formula design and thermal spin coating process improvement, the present invention can greatly improve the mechanical properties, ablation resistance and high temperature resistance of the cross-linked rubber sealing film, and can accurately control the thickness of the rubber sealing film to no more than 0.5 mm.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) Improve the high temperature resistance of rubber sealing membrane, with the temperature resistance grade higher than 300℃; (2) Improve the mechanical properties of rubber sealing membranes, with tensile strength reaching over 8.0 MPa and elongation at break reaching over 280%; (3) Sealing films with a thickness of less than 0.5 mm can be prepared, and the thickness of the film can be precisely controlled to 0.01 mm. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0027] The experimental materials used in the examples and comparative examples of the present invention are as follows: Including high phenyl silicone rubber, medium phenyl silicone rubber, fluorosilicone rubber, high temperature internal release agent, white carbon black, aramid staple fiber, structure regulator, accelerator, vulcanizer and zinc stearate.

[0028] Preferably, the high-phenyl silicone rubber is a siloxane and methylphenylsiloxane polymer containing 40% or more phenyl groups in the main chain.

[0029] Preferably, the medium phenyl silicone rubber is a siloxane and methylphenyl silicone polymer containing 20% ​​to 40% phenyl content in the main chain.

[0030] Preferably, the fluorosilicone rubber is γ-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane.

[0031] Preferably, the high-temperature internal mold release agent is a mixture of low molecular weight phenyl silicone rubber and boron carbide in a weight ratio of 10:1.

[0032] Preferably, the white carbon black is hydrated silicon dioxide prepared by a gas phase method.

[0033] Preferably, the aramid staple fiber is a synthetic fiber with high temperature resistance.

[0034] Preferably, the structure regulator is polytrifluoropropyl hydroxysiloxane.

[0035] Preferably, the accelerator is triallyl isocyanurate (accelerator TAIC).

[0036] Preferably, the vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5).

[0037] Preferably, the zinc stearate is a product of Xilong Science Co., Ltd., and its grade is analytically pure (AR).

[0038] (1) Phenyl silicone rubber is a high molecular weight linear polysiloxane containing phenylsiloxane or methylphenylsiloxane segments in the main chain. In this experiment, products from Yucheng Bito Silicone Co., Ltd. were selected. They include medium phenyl silicone rubber BETO-350 (phenyl content 27%) and high phenyl silicone rubber BETO-400 (phenyl content 42%).

[0039] (2) Fluorosilicone rubber is γ-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane. This experiment uses the product of DuPont Company of the United States, brand FVMQ.

[0040] (3) The high-temperature internal release agent is a mixture of low molecular weight phenyl silicone rubber and boron carbide in a weight ratio of 10:1. The product of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd. was selected in this experiment.

[0041] (4) Silica Fumed A380 is a product of Evonik (China) Investment Co., Ltd.

[0042] (5) Aramid staple fiber, product of DuPont Company of the United States, brand: 1414.

[0043] (6) Polytrifluoropropyl hydroxysiloxane, a product of Dalian Bono Reagent Co., Ltd.

[0044] (7) The accelerator triallyl isocyanurate (accelerator TAIC) is a product of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd.

[0045] (8) The curing agent 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5) is a product of Dalian Ruisheng Rubber and Plastic Materials Co., Ltd.

[0046] (9) Zinc stearate and ethyl acetate were obtained from Xilong Science Co., Ltd., with the grade of analytical grade (AR).

[0047] Example 1 (1) 50 parts of high-phenyl silicone rubber, 30 parts of medium-phenyl silicone rubber, 20 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 30°C, a stirring speed of 20 rpm and a mixing time of 30 minutes to obtain a sealing film adhesive solution; (2) The sealing film adhesive obtained in step (1) was mixed with 10 parts of a high-temperature internal release agent, 20 parts of white carbon black, 5 parts of aramid staple fibers, 5 parts of a structure regulator, 5 parts of an accelerator, 3.0 parts of a vulcanizing agent, and 1 part of zinc stearate in a reactor at a mixing temperature of 70° C., a stirring paddle speed of 40 rpm, and a mixing time of 30 minutes to obtain a sealing film mixed adhesive; (3) The sealing film mixed glue obtained in step (2) was spin-coated and vulcanized on a rotating hot platform at a platform temperature of 200°C for 120 minutes to obtain a rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0048] Example 2: (1) 70 parts of high-phenyl silicone rubber, 20 parts of medium-phenyl silicone rubber, 10 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 50°C, a stirring speed of 40 rpm and a mixing time of 10 minutes to obtain a sealing film adhesive solution; (2) The sealing film glue obtained in step (1) was mixed with 5 parts of high-temperature internal mold release agent, 10 parts of white carbon black, 2 parts of aramid staple fiber, 3 parts of structure regulator, 0.5 parts of accelerator, 1.0 part of vulcanizing agent and 1 part of zinc stearate in a reactor at a mixing temperature of 25°C, a stirring paddle speed of 40 rpm, and a mixing time of 60 minutes to obtain a sealing film mixed glue; (3) The sealing film mixed glue obtained in step (2) was spin-coated and vulcanized on a rotating hot platform at a platform temperature of 150°C for 300 minutes to obtain a rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0049] Example 3: (1) 60 parts of high-phenyl silicone rubber, 20 parts of medium-phenyl silicone rubber, 20 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 35°C, a stirring speed of 30 rpm and a mixing time of 25 minutes to obtain a sealing film adhesive solution; (2) The sealing film adhesive obtained in step (1) was mixed with 8 parts of a high-temperature internal release agent, 15 parts of white carbon black, 3 parts of aramid staple fibers, 4 parts of a structure regulator, 2 parts of an accelerator, 1.5 parts of a vulcanizing agent, and 1 part of zinc stearate in a reactor at a mixing temperature of 50° C., a stirring paddle speed of 30 rpm, and a mixing time of 40 minutes to obtain a sealing film mixed adhesive; (3) The sealing film mixed glue obtained in step (2) was spin-coated and vulcanized on a rotating hot platform at a platform temperature of 180°C for 200 minutes to obtain a rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0050] Example 4: (1) 60 parts of high-phenyl silicone rubber, 30 parts of medium-phenyl silicone rubber, 10 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 35°C, a stirring speed of 25 rpm and a mixing time of 15 minutes to obtain a sealing film adhesive solution; (2) The sealing film glue obtained in step (1) was mixed with 7 parts of high-temperature internal release agent, 12 parts of white carbon black, 3 parts of aramid staple fiber, 4 parts of structure regulator, 3 parts of accelerator, 1.0 part of vulcanizing agent and 1 part of zinc stearate in a reactor at a mixing temperature of 60°C, a stirring paddle speed of 20 rpm, and a mixing time of 60 minutes to obtain a sealing film mixed glue; (3) The sealing film mixed glue obtained in step (2) was spin-coated and vulcanized on a rotating hot platform at a platform temperature of 170°C for 240 minutes to obtain a rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0051] Example 5: (1) 60 parts of high-phenyl silicone rubber, 25 parts of medium-phenyl silicone rubber, 15 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 45°C, a stirring paddle speed of 40 rpm and a mixing time of 12 minutes to obtain a sealing film adhesive solution; (2) The sealing film adhesive obtained in step (1) was mixed with 9 parts of a high-temperature internal release agent, 14 parts of white carbon black, 3 parts of aramid staple fibers, 4 parts of a structure regulator, 2 parts of an accelerator, 1.0 part of a vulcanizing agent, and 1 part of zinc stearate in a reactor at a mixing temperature of 60° C., a stirring paddle speed of 20 rpm, and a mixing time of 60 minutes to obtain a sealing film mixed adhesive; (3) The sealing film mixed glue obtained in step (2) was spin-coated and vulcanized on a rotating hot platform at a platform temperature of 160°C for 300 minutes to obtain a rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0052] Comparative Example 1: (1) 60 parts of high-phenyl silicone rubber, 20 parts of medium-phenyl silicone rubber, 20 parts of fluorosilicone rubber and 100 parts of ethyl acetate were mixed in a reactor at a mixing temperature of 35°C, a stirring speed of 30 rpm and a mixing time of 25 minutes to obtain a sealing film adhesive solution; (2) The sealing film adhesive obtained in step (1) was mixed with 8 parts of a high-temperature internal release agent, 15 parts of white carbon black, 3 parts of aramid staple fibers, 4 parts of a structure regulator, 2 parts of an accelerator, 1.5 parts of a vulcanizing agent, and 1 part of zinc stearate in a reactor at a mixing temperature of 50° C., a stirring paddle speed of 30 rpm, and a mixing time of 40 minutes to obtain a sealing film mixed adhesive; (3) The sealing film mixed adhesive obtained in step (2) was dried in an oven (80°C for 24 hours) to remove the ethyl acetate. The dried sealing film mixed adhesive was then vulcanized and molded in a flat vulcanizer (180°C for 20 minutes). After molding, the mixed adhesive was taken out and placed in an oven (180°C for 180 minutes) for a second stage vulcanization to obtain a comparative rubber sealing film. The tensile strength, elongation at break, temperature resistance grade, film thickness, and film dimensional accuracy of the comparative rubber sealing film were tested. The test results are shown in Tables 1 and 2.

[0053] Table 1 *Tensile strength / MPa *Elongation at break / % *Heat resistance level / ℃ Example 1 8.9 320.0 350 Example 2 10.2 287.3 350 Example 3 9.2 305.7 350 Example 4 9.7 302.1 350 Example 5 9.6 298.0 350 Comparative Example 1 6.3 154.2 200 *Test tensile strength and elongation at break in accordance with the national standard "GB / T 528-2009 Vulcanized rubber or thermoplastic rubber - Determination of tensile stress-strain properties"; *The temperature resistance grade is determined in accordance with "GB / T 20028-2005 Application of Arrhenius diagram to estimate the storage life and maximum operating temperature of polymer materials", with tensile strength as the test value and 6.5MPa as the test index.

[0054] Table 2 *Film thickness / mm *Film size accuracy / mm Example 1 0.47 ±0.006 Example 2 0.38 ±0.009 Example 3 0.36 ±0.006 Example 4 0.37 ±0.007 Example 5 0.39 ±0.008 Comparative Example 1 1.06 ±0.522 Through targeted formulation design and improved thermal spin coating processes, the present invention significantly enhances the mechanical properties of the cross-linked rubber sealing film, achieving a tensile strength exceeding 8.0 MPa and an elongation at break exceeding 280%. The film also exhibits ablation resistance and high-temperature resistance, with a temperature rating exceeding 300°C. The thickness of the rubber sealing film can be precisely controlled to no more than 0.5 mm, achieving precision control of 0.01 mm. This approach addresses existing issues with the composite material preparation process for rubber sealing films, and the technical approach and preparation method have not been reported in the literature.

Claims

1. A formula for preparing a rubber sealing film for composite materials, characterized in that: The components for preparing the rubber sealing film for composite materials include, by weight, 50-70 parts of high-phenyl silicone rubber, 20-30 parts of medium-phenyl silicone rubber, 10-20 parts of fluorosilicone rubber, 5-10 parts of high-temperature internal mold release agent, 10-20 parts of white carbon black, 2-5 parts of aramid staple fibers, 3-5 parts of structural regulator, 0.5-5 parts of accelerator, 1.0-3.0 parts of vulcanizing agent and 1 part of zinc stearate.

2. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The high-phenyl silicone rubber contains siloxane and methylphenylsiloxane polymers with a phenyl content of ≥40% in the main chain.

3. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The medium phenyl silicone rubber contains siloxane and methylphenyl silicone polymer with a phenyl content of 20% to 40% in the main chain.

4. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The fluorosilicone rubber is gamma-trifluoropropylmethylpolysiloxane, which is a copolymer of methylsiloxane, vinylsiloxane and trifluoropropylsiloxane.

5. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The high-temperature internal mold release agent is a mixture of low-molecular-weight phenyl silicone rubber and boron carbide in a weight ratio of 10:

1.

6. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The white carbon black is hydrated silicon dioxide prepared by a gas phase method.

7. The formula for preparing a rubber sealing film for composite materials according to claim 1, characterized in that: The structure regulator is polytrifluoropropyl hydroxysiloxane; the accelerator is triallyl isocyanurate; and the vulcanizing agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (bis-2-5).

8. The method for preparing a rubber sealing film for composite materials according to any one of claims 1 to 7, wherein: The following steps are involved: S1, mixing high phenyl silicone rubber, medium phenyl silicone rubber and fluorosilicone rubber in ethyl acetate to obtain a sealing film glue solution; S2, mixing the sealing film glue obtained in S1 with a high-temperature internal mold release agent, white carbon black, aramid staple fiber, a structure regulator, an accelerator, a vulcanizing agent, and zinc stearate to obtain a sealing film mixed glue; S3, spin coating and vulcanizing the sealing film mixed rubber obtained in S2 to obtain a rubber sealing film.

9. The processing method according to claim 8, characterized in that: The following steps are involved: S1. Mix 50-70 parts of high-phenyl silicone rubber, 20-30 parts of medium-phenyl silicone rubber, 10-20 parts of fluorosilicone rubber and 100 parts of ethyl acetate in a reactor at a mixing temperature of 30-50° C., a stirring paddle speed of 20-40 rpm, and a mixing time of 10-30 minutes to obtain a sealing film adhesive solution; S2, mixing the sealing film glue obtained in S1 with 5-10 parts of high-temperature internal release agent, 10-20 parts of white carbon black, 2-5 parts of aramid staple fiber, 3-5 parts of structure regulator, 0.5-5 parts of accelerator, 1.0-3.0 parts of vulcanizing agent and 1 part of zinc stearate in a reactor at a mixing temperature of 25-70° C., a stirring paddle speed of 20-40 rpm, and a mixing time of 30-60 minutes to obtain a sealing film mixed glue; S3. The sealing film mixed glue obtained in S2 is spin-coated and vulcanized on a rotating hot platform at a platform temperature of 150-200° C. for 120-300 minutes to obtain a rubber sealing film.

10. Use of the rubber sealing film according to any one of claims 1 to 7 in the preparation of composite materials.