Epoxy glue release cloth membrane material with multi-layer structure as well as preparation method and application of epoxy glue release cloth membrane material

Abstract

The invention relates to the field of composite membrane materials, and particularly discloses a multilayer structure epoxy glue release cloth membrane material as well as a preparation method and application thereof. The multilayer structure epoxy glue release cloth membrane material comprises epoxy resin glue and release cloth, wherein the epoxy resin glue is coated on the surface of the release cloth; the preparation method comprises the following steps: preheating the epoxy resin adhesive to 42-48 DEG C, keeping the temperature for 2-2.5 h, heating the epoxy resin adhesive to 78-82 DEG C, keeping the temperature for 0.5-0.6 h, coating the surface of one side of the release cloth with the epoxy resin adhesive to form a film after the temperature is kept, the thickness of the release cloth is 0.05 mm, the coating thickness is 0.8-1.2 mm, the temperature of the epoxy resin adhesive is kept at 75-80 DEG C during coating, and the epoxy resin adhesive is taken out from the surface of one side of the release cloth. And cooling the coated epoxy glue release cloth membrane material with the multi-layer structure to be below 30 DEG C, so as to obtain the epoxy glue release cloth membrane material with the multi-layer structure. The multilayer structure epoxy glue release cloth membrane material can be used for forming a carbon fiber composite material, and has the advantages that the release cloth is separated without residues, and the bonding strength is high.

Description

Technical Field

[0001] The present application relates to the field of composite membrane materials, and more specifically, to a multi-layer epoxy adhesive release cloth membrane material and a preparation method and application thereof. Background Art

[0002] With the booming development of modern manufacturing industry, composite materials are widely used in many fields such as aerospace, automobile, electronics and electrical appliances due to their excellent mechanical properties and lightweight characteristics.

[0003] The manufacture of composite materials often requires bonding of multilayer structures, a key process known as composite molding. Looking back at traditional composite molding methods, mechanical fastening, adhesive bonding, and hot pressing are more common. However, these methods have obvious drawbacks. Mechanical fastening increases the weight of the composite material and raises the cost; hot pressing has harsh environmental requirements and requires high temperature and high pressure, which is not conducive to large-scale production.

[0004] There is a multi-layer epoxy adhesive plus release cloth membrane material used for composite material molding. This membrane material can be coated with adhesive on one side or both sides, and the adhesive is covered with release paper to prevent sticking. When in use, it is cut according to the required specifications, and the release paper is peeled off and laid on the composite component. After curing, the release cloth is separated, leaving the convex points as bonding anchor points, which improves the molding efficiency to a certain extent and avoids environmental pollution caused by grinding.

[0005] However, there are still many problems with the existing technology. It is crucial to maintain the integrity of the release cloth. If it is damaged during the separation process, it will seriously affect the bonding quality of the composite material. Its heat resistance should not be ignored. If the release cloth is easily decomposed or loses its bonding properties under high temperature, it will reduce the durability of the composite material. The wettability of the release cloth to epoxy must be moderate. If the wettability is too good, the release cloth will be difficult to separate; if the wettability is too poor, a good bonding anchor point cannot be formed. In addition, the viscosity and strength of the epoxy adhesive must also be considered. If the viscosity is too high, the release cloth will be difficult to separate; if the strength and toughness are insufficient, it cannot ensure that the composite material is firmly bonded. Summary of the invention

[0006] In order to solve the above problems, the present application provides a multi-layer epoxy adhesive release cloth film material and a preparation method and application thereof.

[0007] The present application provides a multi-layer epoxy adhesive release cloth film material adopts the following technical solution: A multi-layer epoxy adhesive release cloth film material comprises epoxy resin adhesive and release cloth, wherein the epoxy resin adhesive is coated on the surface of the release cloth.

[0008] By adopting the above technical solution, by coating the epoxy resin glue on the release cloth, the two can work together to meet the needs of the composite material molding process. The epoxy resin glue provides a bonding medium for the release cloth, and the release cloth provides a carrier for the application of the epoxy resin glue, which is convenient for the use and separation of the membrane material.

[0009] Optionally, the components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 35% epoxy toughening resin, 1% dispersant, 10% molten microsilica, 7% fumed silica, 1% accelerator, and 6% curing agent.

[0010] By adopting the above technical scheme, 40% bisphenol A epoxy resin provides basic bonding performance and chemical stability; 35% epoxy toughening resin can effectively enhance the toughness of epoxy resin glue, making it not easy to break when subjected to external force, which is crucial to ensure the overall strength and stability of the composite material. 1% dispersant helps to evenly disperse the various components in the glue to avoid agglomeration, thereby ensuring the performance consistency of the glue. 10% molten microsilica and 7% fumed silica can improve the hardness, wear resistance and high temperature resistance of epoxy resin glue, while reducing its shrinkage rate and reducing stress concentration caused by volume changes during the curing process. 1% accelerator accelerates the curing reaction and improves production efficiency, while 6% curing agent ensures that the epoxy resin glue can be fully cured to form a solid bonding structure. The epoxy glue formula of this application can significantly improve the comprehensive performance of epoxy glue, thereby improving the quality and performance of composite materials.

[0011] Optionally, the components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 15% phenoxy resin, 20% epoxy toughening resin, 1% dispersant, 10% molten microsilica, 7% fumed silica, 1% accelerator, and 6% curing agent.

[0012] By adopting the above technical solution, compared with claim 2, part of the epoxy toughening resin is replaced with 15% phenoxy resin. Phenoxy resin has good flexibility and compatibility with epoxy resin, which can further improve the flexibility and impact resistance of epoxy resin glue, so that the composite material can still maintain good performance under complex stress environment. On the basis of ensuring basic performance, the improvement of flexibility and impact resistance is highlighted, providing a better choice for the diversified application of composite materials.

[0013] Optionally, the components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 20% phenoxy resin, 15% epoxy toughening resin, 1% dispersant, 10% molten microsilica, 7% fumed silica, 1% accelerator, and 6% curing agent.

[0014] By adopting the above technical solution, the ratio of phenoxy resin and epoxy toughening resin in epoxy resin adhesive was adjusted, and the combination of 20% phenoxy resin and 15% epoxy toughening resin further optimized the flexibility, impact resistance and comprehensive performance of epoxy adhesive. By changing the ratio of these two key components, the process requirements of different composite material molding can be met.

[0015] Optionally, the viscosity of the epoxy adhesive at 23° C. is 100,000 mPa·s, and the tensile strength of the epoxy adhesive is 50 MPa.

[0016] By adopting the above technical solution, the viscosity of the epoxy adhesive at 23°C is 100,000 mPa·s. This viscosity value not only ensures the good fluidity of the epoxy adhesive during the coating process, so that it can be evenly coated on the release cloth, but also ensures that in the subsequent operation process, such as when the release cloth and the epoxy adhesive are separated, the release cloth will not be difficult to separate or the epoxy adhesive will not flow due to the low viscosity. At the same time, the tensile strength of the epoxy adhesive is 50 MPa. This high tensile strength ensures that the composite material can withstand a large external force after bonding and is not prone to debonding, thereby ensuring the bonding reliability of the composite material. Compared with the situation in the prior art where the viscosity and strength of epoxy adhesive cannot meet the actual needs, the present claim effectively solves the problems of difficult separation of the release cloth and weak bonding of the composite material by accurately controlling the viscosity and strength of the epoxy adhesive, thereby improving the production quality and efficiency of the composite material.

[0017] Optionally, the release fabric is made of nylon 66 or polyimide film, and the nylon 66 has a gram weight of 80-90 gsm.

[0018] By adopting the above technical solution, nylon 66 has good mechanical properties, wear resistance and heat resistance. Its specific weight ensures that the release cloth has a certain strength while not being too thick and heavy, which affects its operating performance during the composite material molding process. The polyimide film has excellent high temperature resistance, chemical stability and mechanical properties. Choosing these two materials as release cloth can effectively improve the heat resistance of the release cloth, making it less likely to decompose or lose its bonding properties in a high temperature environment, thereby improving the durability of the composite material. At the same time, good mechanical properties ensure the integrity of the release cloth during the separation process, avoiding the impact of damage to the release cloth on the bonding quality of the composite material.

[0019] In a second aspect, the present application provides a method for preparing a multi-layer epoxy adhesive release cloth film material, using the following technical solution: A method for preparing a multi-layer epoxy adhesive release cloth film material, comprising the following steps: The epoxy resin glue is preheated to 42-48°C and kept warm for 2-2.5h. The epoxy resin glue is then heated to 78-82°C and kept warm for 0.5-0.6h. After the insulation is completed, the epoxy resin glue is coated on one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm, and the coating thickness is 0.8-1.2mm. During coating, the temperature of the epoxy resin glue is maintained at 75-80°C to obtain a multi-layer epoxy adhesive release cloth film material. After coating, the multi-layer epoxy adhesive release cloth film material is cooled to below 30°C.

[0020] Through the above scheme, the various components in the epoxy resin glue can be fully mixed and reacted to achieve the best performance state. The coating is carried out at a specific temperature, and the temperature of the epoxy resin glue is maintained at 75-80°C, and the coating thickness is 0.8-1.2mm. This ensures that the epoxy glue can be evenly coated on the release cloth to form a good bonding layer. At the same time, controlling the coating thickness can ensure that the interaction between the release cloth and the epoxy glue is just right, which is conducive to subsequent separation and the formation of suitable bonding anchor points. After the coating is completed, the temperature is lowered to below 30°C, which helps to stabilize the structure of the film material and prevent performance changes caused by excessive temperature. The preparation method of the present application ensures the stability and consistency of the quality of the film material and improves the yield rate of the product by precisely controlling the temperature, time and coating parameters.

[0021] Optionally, the following steps are also included: The epoxy resin glue is preheated to 42-48°C, kept warm for 2-2.5h, and then heated to 78-82°C and kept warm for 0.5-0.6h. After the insulation, the epoxy resin glue is coated on one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm, and the coating thickness is 0.8-1.2mm. The temperature of the epoxy resin glue is maintained at 75-80°C during coating. The epoxy resin glue after film coating is cooled to below 30°C. After cooling, a layer of epoxy resin glue with a thickness of 0.8-1.2mm is coated on the surface of the epoxy resin glue film layer. The temperature of the epoxy resin glue is maintained at 75-80°C during coating. After coating, the epoxy resin glue film layer is cooled to below 30°C to obtain a multi-layer epoxy glue release cloth film material.

[0022] Through the above scheme, the thickness of the epoxy glue is further increased, which can enhance the bonding strength of the composite material. At the same time, through two coatings, the performance of the epoxy glue can be made more uniform, avoiding local performance differences. During the coating process, the temperature is also strictly controlled at 75-80°C, and cooled to below 30°C after the coating is completed, ensuring the quality of each coating and the stability of the film material. The preparation method of the present application further optimizes the performance of the film material by increasing the number of coatings, provides a stronger bonding ability for the composite material, solves the problem of insufficient bonding strength in the prior art, and improves the reliability and service life of the composite material.

[0023] In a third aspect, the present application provides an application of a multi-layer epoxy adhesive release cloth film material, using the following technical solution: An application of a multi-layer epoxy adhesive release cloth membrane material, wherein the multi-layer epoxy adhesive release cloth membrane material is applied in a carbon fiber composite material molding process.

[0024] By adopting the above technical solution, carbon fiber composite materials have excellent properties such as high strength and low density, but the requirements for bonding materials and processes are high during the molding process. The multi-layer epoxy adhesive release cloth membrane material of the present application can give full play to its advantages, such as maintaining the integrity of the release cloth, good heat resistance, moderate wettability, and suitable viscosity and strength of the epoxy adhesive, etc., to meet various needs in the molding process of carbon fiber composite materials. By using the membrane material of the present invention, the molding quality and efficiency of carbon fiber composite materials can be improved, quality defects caused by existing technical problems can be avoided, and environmental pollution caused by grinding can be reduced, which meets the requirements of modern manufacturing industry for high-performance materials and environmentally friendly production.

[0025] In summary, this application has the following beneficial effects: 1. Since the present application adopts a multi-layer structure of epoxy adhesive plus release cloth film material, the integrity of the release cloth is ensured through the single-sided or double-sided adhesive coating and release paper anti-sticking design, which avoids damage during separation and improves the bonding quality of the composite material. The release cloth is made of heat-resistant materials to ensure its stable performance at high temperatures, thereby improving the durability of the composite material. At the same time, the viscosity and strength of the epoxy adhesive are optimized to ensure the operability of the release cloth separation and the reliability of the bonding of the composite material, providing a solid foundation for the high-quality application of the composite material.

[0026] 2. In this application, nylon 66 or polyimide film is preferably used as the release cloth, which has moderate wettability to epoxy, making it easy to remove during the separation process and forming a good bonding anchor point. The release cloth is laid on the composite component part, and after being cured synchronously with the main body, it is separated to leave convex points to form a quick bonding surface, and the surface of the epoxy glue forms the release cloth surface texture and convex points. These characteristics greatly improve the molding efficiency of the composite material, simplify the operation process, and meet the needs of large-scale production.

[0027] 3. The method of the present application ensures that no release cloth remains on the epoxy adhesive and avoids the grinding process, effectively reducing the environmental pollution caused by grinding, meeting the environmental protection requirements of modern manufacturing industry and promoting the composite material manufacturing industry to develop in a green and sustainable direction. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the experiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0029] Preparation example of epoxy resin glue Preparation Example 1 A preparation method of epoxy resin glue: In a 1000L high-speed disperser with vacuum function, first put in 40kg bisphenol A epoxy resin (YD-128), 20kg epoxy toughening resin (kaneka MX154), 15kg epoxy toughening resin (HYPOX RK-84L) and 1kg dispersant (BYK 9076). Cover the kettle, start stirring and vacuuming, set the stirring speed to 25rpm, the dispersing speed to 300rpm, and continue stirring for 5 minutes.

[0030] Prepare 7 kg of fumed silica (WACKER H18), use nitrogen to break the vacuum environment in the high-speed disperser, open the kettle cover, and put in 1 / 3 of the fumed silica. Cover the kettle cover, start stirring and dispersing, set the stirring speed to 20rpm, the dispersing speed to 100rpm, and stir for 2 minutes. Then turn on the vacuum pump, adjust the stirring speed to 25rpm, increase the dispersing speed to 600rpm, and stir for another 5 minutes. Repeat this step until all the fumed silica is evenly dispersed in the rubber.

[0031] Add 10kg of molten microsilica powder (Lianrui New Materials NQ1120D) into the kettle. Cover the kettle, turn on the vacuum, and stir and disperse at the same time. The stirring speed is 25rpm and the dispersion speed is 300rpm. Continue stirring for 5 minutes.

[0032] Open the lid, take a sample, scrape it and check the appearance to ensure that the appearance of the rubber is uniform and free of obvious impurities. At the same time, use a thermometer to measure the internal temperature of the material to ensure that the temperature is below 45°C. Then add 1kg of accelerator (Omicure U52M) into the kettle. Cover the kettle, turn on the vacuum, stir at 25rpm, disperse at 300rpm, and stir for 5 minutes.

[0033] Add 6kg of curing agent (Omicure DDA10) and catalyst into the kettle. Cover the kettle, start vacuum, stir and disperse, stirring speed 25rpm, dispersion speed 100rpm, stir for 2 minutes, start vacuum, maintain stirring speed at 25rpm, increase dispersion speed to 500rpm, and stir for another 10 minutes.

[0034] Keep the vacuum pumping state, turn off the dispersion function, adjust the stirring speed to 10rpm, and perform vacuum degassing for 30 minutes. After degassing, break the vacuum with nitrogen, open the lid to take samples again, scrape and check the appearance, and use a thermometer to measure the internal temperature of the material to ensure that the temperature is still below 45°C. Finally, discharge the material. Use an 80μm filter to filter the product during discharge, and connect the discharge port with a pipe to prevent the material from falling directly into the barrel and introducing bubbles.

[0035] Preparation Example 2 A method for preparing epoxy resin glue: The difference from Preparation Example 1 is that 40kg bisphenol A epoxy resin, 15kg phenoxy resin (Huntsman PKHB), 20kg epoxy toughening resin (kaneka MX154), 0.5kg dispersant (BYK9076), 0.5kg dispersant (BYK 333), 10kg molten microsilica, 7kg fumed silica, 1kg accelerator, and 6kg curing agent are used.

[0036] Preparation Example 3 A method for preparing epoxy resin glue: The difference from Preparation Example 1 is that 40kg bisphenol A epoxy resin, 20kg phenoxy resin, 15kg epoxy toughening resin (HYPOX RK-84L), 1kg dispersant (BYK 333), 10kg molten microsilica, 7kg fumed silica, 1kg accelerator, and 6kg curing agent are used. Example

[0037] Example 1 A method for preparing a multi-layer epoxy adhesive release cloth film material: In this embodiment, the epoxy resin adhesive is prepared by Preparation Example 1. The viscosity of the epoxy resin adhesive at 23° C. is 100,000 mPa·s, and the tensile strength is 50 MPa. The release fabric is made of nylon 66, model AeroFilm TM PP230, weight 85gsm.

[0038] The epoxy resin glue is preheated to 45°C and kept warm for 2 hours. The epoxy resin glue is then introduced into a roller coater, heated to 80°C and kept warm for 0.5 hours. After the insulation is completed, the epoxy resin glue is coated on one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm and the coating thickness is 1mm. The temperature of the epoxy resin glue is maintained at 78°C during coating to obtain a multi-layer epoxy adhesive release cloth film material. The multi-layer epoxy adhesive release cloth film material after coating is cooled to below 30°C.

[0039] Example 2 A method for preparing a multi-layer epoxy adhesive release cloth film material: The difference from Example 1 is that the epoxy resin adhesive in this embodiment is prepared by Preparation Example 2.

[0040] Example 3 A method for preparing a multi-layer epoxy adhesive release cloth film material: The difference from Example 1 is that the epoxy resin adhesive in this embodiment is prepared by Preparation Example 3.

[0041] Example 4 A method for preparing a multi-layer epoxy adhesive release cloth film material: The difference from Example 1 is that the viscosity of the epoxy resin adhesive at 23° C. is 90,000 mPa·s.

[0042] Example 5 A method for preparing a multi-layer epoxy adhesive release cloth film material: The difference from Example 1 is that the viscosity of the epoxy resin adhesive at 23° C. is 110,000 mPa·s.

[0043] Example 6 A method for preparing a multi-layer epoxy adhesive release cloth film material: the difference from Example 1 is that the tensile strength of the epoxy resin adhesive is 40 MPa.

[0044] Example 7 A method for preparing a multi-layer epoxy adhesive release cloth film material: the difference from Example 1 is that the tensile strength of the epoxy resin adhesive is 60 MPa.

[0045] Example 8 A method for preparing a multi-layer epoxy adhesive release cloth film material: the difference from Example 1 is that the release cloth adopts a polyimide film with a purity greater than 95%.

[0046] Example 9 A method for preparing a multi-layer epoxy adhesive release cloth membrane material: the difference from Example 1 is that the epoxy resin glue is preheated to 45°C and kept warm for 2 hours, and then the epoxy resin glue is heated to 80°C and kept warm for 0.5 hours. After the insulation is completed, the epoxy resin glue is coated on the surface of one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm, and the coating thickness is 1mm. During coating, the temperature of the epoxy resin glue is maintained at 78°C, and the epoxy resin glue after film coating is cooled to below 30°C. After cooling, a layer of epoxy resin glue with a thickness of 1mm is coated on the surface of the epoxy resin glue film layer. During coating, the temperature of the epoxy resin glue is maintained at 78°C. After coating, the epoxy resin glue film layer is cooled to below 30°C to obtain a multi-layer epoxy adhesive release cloth membrane material.

[0047] Comparative Example Comparative Example 1 A release cloth film material: A multi-layer epoxy adhesive release cloth film material: The difference from Example 1 is that the epoxy resin adhesive is a common commercially available product.

[0048] Comparative Example 2 A multi-layer epoxy adhesive release cloth film material: the difference from Example 1 is that the release cloth is made of polyester fiber cloth.

[0049] Comparative Example 3 A multi-layer epoxy adhesive release cloth film material: the difference from Example 1 is that no fumed silica is added to the epoxy resin adhesive.

[0050] Performance testing Detection Methods Use release cloth to lay on the cured carbon fiber composite material containing prepreg of the same specifications, put the release cloth and carbon fiber composite material into a vacuum bag, evacuate to -0.1MPa, keep the pressure for 30 minutes, then heat to 180℃ and keep it for 2 hours to make the epoxy glue and carbon fiber composite material solidify simultaneously. The release cloth can be separated from the epoxy glue, and observe the residual release cloth on the surface of the epoxy glue after separation, the anchor point amount on the surface of the epoxy glue, and the shear strength test.

[0051] Table 1 Test data Combining Example 1 and Comparative Example 1 and Table 1, it can be seen that Comparative Example 1 uses ordinary commercially available epoxy resin glue, and the shear strength is only 25.3Mpa, there is peeling residue, and the anchor area of ​​the resin surface accounts for 40-50%. It can be seen that the epoxy resin glue obtained by Preparation Example 1 of this application in Example 1 has a significant effect on improving the shear strength of the film material, can effectively avoid peeling residue, and the formed anchor area accounts for a larger proportion, which is conducive to improving the bonding effect and stability of the composite material, and has obvious advantages over ordinary commercial products.

[0052] Combining Example 1 and Comparative Example 2 with Table 1, it can be seen that Example 1 uses nylon 66 release cloth, and Comparative Example 2 uses polyester fiber cloth as release cloth. Although the shear strength of Comparative Example 2 is not much different from that of Example 1, there is peeling residue, and the anchor point area of ​​the resin surface accounts for only 20-30%. This shows that the release cloth selected in this application performs better in preventing peeling residue and promoting the formation of more effective bonding anchor points, and is more suitable for multi-layer epoxy adhesive release cloth film material, which can improve the overall performance of the composite material.

[0053] Combining Example 1 and Comparative Example 3 with Table 1, it can be seen that fumed silica is added to the epoxy resin glue of Example 1, but not added to Comparative Example 3. The shear strength of Comparative Example 3 is 27.8 Mpa, with no peeling residue, but the anchor area of ​​the resin surface accounts for 40-50%. This shows that the addition of fumed silica helps to improve the shear strength of the film material and increase the anchor area of ​​the resin surface, which has a positive effect on improving the bonding performance of the composite material.

[0054] Combining Examples 1-3 and Table 1, it can be seen that Examples 1-3 use epoxy resin adhesives with different formulations. The shear strength of Example 1 is 28.8Mpa, that of Example 2 is 30.5Mpa, and that of Example 3 is 28.2Mpa. There is no peeling residue in all three, and the anchor point area of ​​the resin surface accounts for between 70% and 90%. The formulation of Example 2 is relatively more advantageous in improving shear strength.

[0055] It can be seen from Example 1 and Examples 4-7 and Table 1 that the viscosity and tensile strength of the epoxy resin glue have a significant effect on the shear strength of the film material and the proportion of the anchor area of ​​the resin surface. Appropriate viscosity and higher tensile strength are beneficial to improving the performance of the film material.

[0056] It can be seen from Example 1 and Example 8 and Table 1 that, compared with the polyimide film release cloth, the nylon 66 release cloth can enable the film material to obtain higher shear strength and a larger proportion of the resin surface anchor point area, and has more advantages in improving the performance of the film material.

[0057] It can be seen from Example 1 and Example 9 and Table 1 that adding one coating can significantly improve the shear strength of the film material, which has a positive effect on improving the performance of the multi-layer epoxy adhesive release cloth film material.

[0058] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A multi-layer epoxy adhesive release cloth film material, characterized in that: The film material comprises epoxy resin glue and release cloth, and the epoxy resin glue is coated on the surface of the release cloth.

2. The multi-layer epoxy adhesive release cloth film material according to claim 1, characterized in that: The components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 35% epoxy toughening resin, 1% dispersant, 10% molten microsilica powder, 7% fumed silica, 1% accelerator, and 6% curing agent.

3. The multi-layer epoxy adhesive release cloth film material according to claim 1, characterized in that: The components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 15% phenoxy resin, 20% epoxy toughening resin, 1% dispersant, 10% molten microsilica powder, 7% fumed silica, 1% accelerator, and 6% curing agent.

4. The multi-layer epoxy adhesive release cloth film material according to claim 1, characterized in that: The components of the epoxy resin glue include, by mass percentage, 40% bisphenol A epoxy resin, 20% phenoxy resin, 15% epoxy toughening resin, 1% dispersant, 10% molten microsilica, 7% fumed silica, 1% accelerator, and 6% curing agent.

5. The multi-layer epoxy adhesive release cloth film material according to claim 1, characterized in that: The viscosity of the epoxy resin glue at 23° C. is 100,000 mPa·s, and the tensile strength of the epoxy resin glue is 50 MPa.

6. The multi-layer epoxy adhesive release cloth film material according to claim 1, characterized in that: The release fabric is selected from nylon 66 or polyimide film, and the nylon 66 has a gram weight of 80-90 gsm.

7. A method for preparing a multi-layer epoxy adhesive release cloth film according to any one of claims 1 to 6, characterized in that: The following steps are involved: The epoxy resin glue is preheated to 42-48°C and kept warm for 2-2.5h. The epoxy resin glue is then heated to 78-82°C and kept warm for 0.5-0.6h. After the insulation is completed, the epoxy resin glue is coated on one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm and the coating thickness is 0.8-1.2mm. During coating, the temperature of the epoxy resin glue is maintained at 75-80°C to obtain a multi-layer epoxy adhesive release cloth film material. After coating, the multi-layer epoxy adhesive release cloth film material is cooled to below 30°C.

8. The method for preparing the multi-layer epoxy adhesive release cloth film according to claim 7, characterized in that: The following steps are also included: The epoxy resin glue is preheated to 42-48°C and kept warm for 2-2.5h. The epoxy resin glue is then heated to 78-82°C and kept warm for 0.5-0.6h. After the insulation is completed, the epoxy resin glue is coated on one side of the release cloth to form a film. The thickness of the release cloth is 0.05mm, and the coating thickness is 0.8-1.2mm. During coating, the temperature of the epoxy resin glue is maintained at 75-80°C. The epoxy resin glue after film coating is cooled to below 30°C. After cooling, a layer of epoxy resin glue with a thickness of 0.8-1.2mm is coated on the surface of the epoxy resin glue film layer. The temperature of the epoxy resin glue is maintained at 75-80°C during coating. After coating, the epoxy resin glue film layer is cooled to below 30°C to obtain a multi-layer epoxy glue release cloth film material.

9. An application of the multi-layer epoxy adhesive release cloth film according to any one of claims 7 or 8, characterized in that: The multi-layer epoxy adhesive release cloth membrane material is applied in the carbon fiber composite material molding process.

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