A bionic modified resin composite sandwich pressure shell and a preparation method thereof

Abstract

The application discloses a kind of bionic modified resin composite sandwich pressure shell and preparation method thereof, the pressure shell includes at least one unit sandwich, unit sandwich is placed according to the order of one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, one layer of prepreg;Prepreg is obtained after impregnation of silanized carbon fiber by the reaction solution of imine modified epoxy resin, silanized glass fiber is added in the reaction solution;AGE powder is obtained by blending silanized glass fiber and imine modified epoxy resin powder;Two sides of unit sandwich are respectively provided with waterproof layer;Its preparation method is as follows: imine modified epoxy resin material is blended with silanized glass fiber to obtain AGE powder, silanized glass fiber is added into the reaction solution for preparing imine modified epoxy resin material to impregnate silanized carbon fiber to obtain prepreg, layer winding treatment is carried out according to the order, vacuum hot pressing, demolding, to obtain pressure shell.The application realizes light and thin by wrapping prepreg between two layers of surface treated carbon fibers, and the pressure resistance is improved to 5.02MPa.

Description

Technical Field

[0001] This invention relates to a pressure hull for a deep-sea submersible and its preparation method, and more particularly to a biomimetic modified resin composite sandwich pressure hull and its preparation method. Background Technology

[0002] In recent years, with the continuous advancement of technology and the increasing diving depth of submersibles, the requirements for lightweight manned submersible structures have become increasingly stringent, leading to a growing number of non-metallic materials entering the field of submersible material design. Non-metallic materials successfully applied to submersible pressure hulls need to possess characteristics such as light weight and high strength, including resins, ceramics, and glass. Among these, resin composite materials, due to their excellent properties such as high modulus, low density, high strength, and corrosion resistance, have been widely used in pressure-resistant components of deep-sea manned submersibles and gliders, demonstrating great potential in the current development of pressure hulls for deep-sea and full-ocean-depth submersibles.

[0003] Epoxy resin is currently a widely studied non-metallic material for pressure hulls, but its strength and pressure resistance are insufficient for deep-sea environments. Furthermore, under complex and harsh conditions such as the deep sea, epoxy resin composites are susceptible to various factors including impact, tension, compression, abrasion, and corrosion. These factors synergistically accelerate surface and internal damage to the resin material, increasing safety hazards during use. Moreover, epoxy resin itself is a large-molecule, non-covalently cross-linked network, making it difficult to decompose, recycle, and reuse at high temperatures. This increases the difficulty and cost of recycling, resulting in significant resource waste and environmental pollution. Therefore, to improve the utilization rate of epoxy resin materials in deep-sea engineering applications and reduce recycling costs, modification and performance enhancement of epoxy resin materials have become crucial technologies urgently needing breakthroughs in the research of novel pressure hull materials. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a lightweight, pressure-resistant biomimetic modified resin composite sandwich pressure-resistant shell.

[0005] The second objective of this invention is to provide a method for preparing the above-mentioned biomimetic modified resin composite sandwich pressure-resistant shell.

[0006] Technical Solution: The biomimetic modified resin composite sandwich pressure-resistant shell of the present invention includes at least one unit sandwich layer, wherein the unit sandwich layer is stacked in the following order: one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, and one layer of prepreg; the prepreg is obtained by impregnating silanized carbon fibers with an imide-modified epoxy resin reaction solution, wherein silanized glass fiber is added to the reaction solution; the AGE powder is obtained by blending silanized glass fiber and imide-modified epoxy resin powder; and waterproof layers are respectively provided on both sides of the unit sandwich layer.

[0007] Preferably, the thickness of each layer of AGE powder is 0.2-0.4 mm.

[0008] The above-mentioned method for preparing the biomimetic modified resin composite sandwich pressure-resistant shell includes the following steps:

[0009] (1) The carbon fiber and glass fiber were subjected to silanization treatment respectively to obtain silanized carbon fiber and silanized glass fiber;

[0010] (2) Preparation of imine-modified epoxy resin materials;

[0011] (3) After pulverizing the imine-modified epoxy resin material, it is mixed with silanized glass fiber in a solvent, filtered and dried to obtain glass fiber reinforced imine-modified epoxy resin powder, which is denoted as AGE powder.

[0012] (4) Add silanized glass fiber to the reaction solution for preparing imine-modified epoxy resin material, and then impregnate the silanized carbon fiber to obtain prepreg;

[0013] (5) The mold is laid up and wound in the following order: one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, and one layer of prepreg. A waterproof layer is set on the first and last layers to obtain a biomimetic modified resin composite sandwich pressure-resistant shell winding sample. After vacuum hot pressing, the sample is demolded to obtain a biomimetic modified resin composite sandwich pressure-resistant shell.

[0014] Preferably, in step (1), the carbon fiber is first desized and oxidized during silanization; in the desizing step, the volume ratio of water to acetone is 1:1, the soaking time is 2-4 hours, and the drying temperature is 80℃; in the oxidation process, the concentration of H2O2 used is 20%, and the ultrasonic treatment time is set to 0.5-1 hours; the volume percentages of water and silane coupling agent are respectively 2%-5% of the total volume of water, silane coupling agent, and anhydrous ethanol; more preferably, in the silanization step, the volume ratio of anhydrous ethanol, distilled water, and silane coupling agent is 90:5:5, the stirring time is 2 hours, the pH is adjusted to 7 after washing, and the drying temperature is 80-100℃. Preferably, the carbon fiber used in this invention is T300 plain weave carbon fiber cloth with a cutting area of ​​210×1760mm. 2 The silane coupling agent used in this invention promotes covalent bonding between different layers in the biomimetic AGCE pressure-resistant shell, thereby improving the interfacial forces between the different layers. Preferably, the silane coupling agent used in this invention is 3-aminopropyltrimethoxysilane, abbreviated as APTMS.

[0015] Preferably, in step (1), when silanizing the glass fiber, the solvent used is DMF, and the silane coupling agent is 3-aminopropyltrimethoxysilane; the mass ratio of glass fiber to organic solvent is 1:10-1:15; preferably, the mass ratio of glass fiber to DMF solution is 1:10, the ultrasonic dispersion time is 1-2 hours, the volume of silane coupling agent accounts for 2-5% of the total volume of silane coupling agent and organic solvent, the reaction temperature is 80-100℃, the stirring reaction time is 2-5 hours, and the drying temperature of the resulting silanized product is 100℃. Preferably, the diameter of the glass fiber is 10µm-20µm.

[0016] Preferably, the process of preparing the imine-modified epoxy resin material in step (2) is as follows: the diamine used for prepolymerization is added to the ethanol solution of dialdehyde to carry out the prepolymerization reaction to form solution 1; the diamine and triamine used for crosslinking are dissolved in the ethanol solution to form solution 2; solution 1 and solution 2 are mixed and reacted with the ethanol solution of epoxy resin to form an epoxy resin solution containing imine bonds, and the imine-modified epoxy resin material is obtained after drying.

[0017] The ratio of amine groups to aldehyde groups added in solution 1 is 1:3 to 2:3; the ratio of aldehyde groups to amine groups added in all reactants is 1:1, and the molar ratio of epoxy groups to amine groups is 1.5:1 to 1.8:1; the mass concentration of the epoxy resin ethanol solution is 4.05-5.9%; and the mass concentration of the dialdehyde ethanol solution is 2.5-3.5%.

[0018] Preferably, the epoxy resin used in this invention is a commercially available epoxy resin, such as E51 or E44; the dialdehyde is selected from at least one of terephthalaldehyde, isophthalaldehyde, and glutaraldehyde; the diamine used for prepolymerization is selected from diethylenetriamine and / or triethylenetetramine; the diamine used for crosslinking is selected from at least one of triethylenetetramine, ethylenediamine, polyetheramine, and diethylenetriamine; and the triamine is selected from tris(2-aminoethyl)amine. More preferably, the diamine is triethylenetetramine; the volume fraction of triethylenetetramine (TEPA) and tris(2-aminoethyl)amine (TETA) dissolved in ethanol is 20%-50%; the dissolution ratio of epoxy resin to ethanol solution is 1g epoxy resin dissolved in 20-30ml ethanol; and the dissolution ratio of terephthalaldehyde to ethanol solution is 1g terephthalaldehyde dissolved in 35-50ml ethanol.

[0019] Preferably, in step (3), an ethanol solution is selected to blend the imine-modified epoxy resin material and the silanized glass fiber, the mixing and stirring time is 2-4 hours, the drying temperature is 40℃, and the product is screened through an 80-mesh sieve.

[0020] Preferably, in step (3), the mass ratio of the silanized glass fiber to the imine-modified epoxy resin powder is 1:9 to 1:19.

[0021] Preferably, in step (4), the mass of the silanized glass fiber accounts for 5%-10% of the mass of the reaction solution used to prepare the imine-modified epoxy resin material.

[0022] Preferably, in step (5), the prepreg is laid flat, and the AGE powder is evenly layered on the prepreg with a layer thickness of 0.2-0.4 mm and a layer area of ​​210×220 mm. 2 First, a layer of carbon fiber coated with waterproof material is wound around the inner lining mold as a waterproof layer. Then, a layer of prepreg with AGE powder is laid on it and wound around the inner lining mold. Next, on the surface of the AGE powder, layers of prepreg, AGE powder, AGE powder, and prepreg are laid and wound in sequence. Finally, a layer of carbon fiber coated with waterproof material is wound around it as a waterproof layer. The surface of the inner lining mold is coated with a release agent. A cylindrical inner lining mold is preferred. A cylindrical metal shell of 70mm*210mm is more preferred as the inner lining mold.

[0023] Preferably, in step (5), the AGE powder layup area is 210×220mm. 2 The thickness of the AGE powder layer is set to 0.2-0.4 mm.

[0024] Preferably, in step (5), the hot pressing temperature is set to 90℃-105℃, the hot pressing time is 4-6 hours, the heat preservation temperature is 70℃-80℃, and the heat preservation time is 4-5 hours.

[0025] Beneficial effects: Compared with the prior art, the present invention achieves the following significant effects: (1) The biomimetic AGCE pressure-resistant shell of the present invention achieves thinness by wrapping prepreg between two layers of surface-treated carbon fibers, which allows the biomimetic AGCE pressure-resistant shell to wrap more carbon fiber layers under the same thickness conditions; and the pressure resistance is increased by 99% compared with the single-layer GCE pressure-resistant shell, and the pressure resistance performance is improved to 5.02MPa. (2) There is a stronger interfacial contact force between the modified APTMS-CF layer and the AGE layer in the biomimetic AGCE pressure-resistant shell, which makes the biomimetic AGCE pressure-resistant shell more capable of resisting external pressure. (3) There is disordered APTMS-GF between the interlayer interfaces in the biomimetic pressure-resistant shell, which makes the interlayers have stronger adhesion. Attached Figure Description

[0026] Figure 1 A biomimetic mapping model of the AGCE composite sandwich pressure-resistant shell;

[0027] Figure 2 Schematic diagram of the fabrication process of the AGCE composite sandwich pressure-resistant shell;

[0028] Figure 3 This is a mold diagram for an AGC composite sandwich pressure-resistant shell.

[0029] Figure 4 This is a picture of an actual AGCE composite sandwich pressure-resistant shell.

[0030] Figure 5 XRD test pattern of APTMS-CF;

[0031] Figure 6 Infrared spectral analysis of AGE composite materials;

[0032] Figure 7 Electron micrograph of the fracture surface of AGE composite material;

[0033] Figure 8 The image shows the results of a deep-sea hydrostatic pressure test on an AGCE composite sandwich pressure hull. Detailed Implementation

[0034] The present invention will now be described in further detail.

[0035] Example 1

[0036] like Figure 1As shown, this embodiment provides a biomimetic modified resin composite sandwich pressure-resistant shell, including at least one unit sandwich layer. The unit sandwich layer is stacked in the following order: one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, and one layer of prepreg. The prepreg is obtained by impregnating silanized carbon fibers with an imide-modified epoxy resin reaction solution, and silanized glass fiber is added to the reaction solution. The AGE powder is obtained by blending silanized glass fiber and imide-modified epoxy resin powder. Waterproof layers are provided on both sides of the unit sandwich layer.

[0037] like Figure 2 As shown, this embodiment provides a method for preparing the above-mentioned biomimetic modified resin composite sandwich pressure-resistant shell, including the following steps:

[0038] Step S1: Cut the plain weave carbon fiber cloth (CF) to a cutting area of ​​210×1760mm. 2 Then, an acetone / water solution was prepared at a volume ratio of 1:1 and desized for 3 hours. Next, the desized CF was placed in a 20% H2O2 solution for oxidation treatment for 1 hour. Finally, it was placed in a mixed solution of anhydrous ethanol: distilled water: APTMS (v / v / v) = 90:5:5 and stirred. After washing with deionized water several times and adjusting the pH to 7, it was placed in a drying oven for drying at 80℃ to prepare silanized carbon fiber, denoted as APTMS-CF.

[0039] Step S2: Weigh GF and DMF in a beaker at a mass ratio of 1:10 to form a mixed solution. After ultrasonic dispersion for 2 hours, add 5% volume fraction of APTMS to the mixed solution. Heat to 90℃, stir for 2 hours, and dry at 100℃ to successfully prepare silanized glass fiber, denoted as APTMS-GF.

[0040] Step S3: Weigh the epoxy resin and terephthalaldehyde; dissolve terephthalaldehyde in ethanol solution at a ratio of 1g terephthalaldehyde (TA) to 40ml EtOH, and record this as solution 1; then add diethylenetriamine (DETA) to solution 1 for a prepolymerization reaction for 10s, and record this as solution 2; dissolve 1g epoxy resin (EP) in 25ml... The epoxy resin was dissolved in an ethanol solution with EtOH in the specified proportions, denoted as solution 3. Then, triethylenetetramine (TEPA) and tris(2-aminoethyl)amine (TETA) were dissolved in 20 ml of ethanol solution, denoted as solution 4. Solutions 2, 3, and 4 were then mixed and reacted to form an epoxy resin solution containing imine bonds, i.e., the EP-PI solution, denoted as solution 5. In solution 2, the molar ratio of added amine groups to aldehyde groups was 2:3. The molar ratio of added aldehyde groups to amine groups in all reactants was 1:1, and the molar ratio of epoxy groups to amine groups was 1.7:1. Finally, solution 5 was dried by forced air to obtain the imine-modified epoxy resin material, denoted as EP-PI material.

[0041] Step S4: The EP-PI material prepared in step S3 is pulverized and ground. Then, the mass ratio of APTMS-GF:EP-PI = 1:9 is placed in a beaker, and the corresponding mass of ethanol is added and mixed and stirred for 2 hours, which is recorded as solution 6. After treatment, the mixture is filtered, dried by forced air, sieved through an 80-mesh sieve, and dried at 40°C to obtain AGE powder material.

[0042] Step S5: Prepare silicone paper. First, place APTMS-CF on the silicone paper. Mix 10% by mass of APTMS-GF with solution 7 in step S3 and brush it evenly onto APTMS-CF. The prepreg is successfully prepared and is denoted as PAPTMS-CF.

[0043] Step S6: Lay PAPTMS-CF flat and evenly spread AGE powder onto the PAPTMS-CF. The spread thickness is set to 0.3 mm, and the spread area is 210 × 220 mm. 2 Then, PAPTMS-CF is wrapped around the cylindrical inner liner mold, and a waterproof layer is applied during the wrapping process. The cylindrical inner liner mold is as follows: Figure 3 As shown in the left figure, a 70mm*210mm cylindrical metal shell was used as the inner liner, and the surface of the metal shell was coated with a release agent. The winding sequence was as follows: one layer of waterproof layer, one layer of PAPTMS-CF, one layer of AGE powder, two layers of PAPTMS-CF, one layer of AGE powder, two layers of PAPTMS-CF, one layer of AGE powder, one layer of PAPTMS-CF, and one layer of waterproof layer. Thus, an AGCE sandwich pressure-resistant shell winding sample was successfully prepared. Among them, the waterproof layer is carbon fiber cloth coated with waterproof material.

[0044] Step S7: Place the wound AGCE composite sandwich pressure shell sample into a hot autoclave for vacuum hot pressing treatment. The hot pressing temperature is set to 105℃, the hot pressing time is 5 hours, the holding temperature is 80℃, and the holding time is 5 hours. After that, demolding, trimming and other treatments are performed to successfully prepare the AGCE composite sandwich pressure shell.

[0045] Example 2

[0046] The difference between Example 1 and Example 2 is that:

[0047] In step S1, when silanizing the carbon fiber, the volume percentage of water and silane coupling agent is 2% of the total volume of water, silane coupling agent and anhydrous ethanol, respectively; in step S2, when silanizing the glass fiber, the mass ratio of glass fiber to organic solvent is 1:10, and the volume percentage of silane coupling agent is 2% of the total volume of silane coupling agent and organic solvent.

[0048] In step S3, 1g of terephthalaldehyde is dissolved in 35ml of EtOH; 1g of epoxy resin is dissolved in 20ml of EtOH; the ratio of amine to aldehyde groups added in solution 1 is 1:3; the ratio of aldehyde to amine groups added in all reactants is 1:1, and the molar ratio of epoxy groups to amine groups is 1.5:1.

[0049] In step S4, the mass ratio of silanized glass fiber to imine-modified epoxy resin powder is 1:19; in step S6, the thickness of each layer of AGE powder is 0.2 mm; in step S7, the hot pressing temperature is set to 90°C, the hot pressing time is 6 hours, the heat preservation temperature is 70°C, and the heat preservation time is 4 hours.

[0050] Example 3

[0051] Based on Example 1, the differences from Example 1 are as follows: In step S1, when silanizing the carbon fiber, the volume percentage of water and silane coupling agent is 5% of the total volume of water, silane coupling agent, and anhydrous ethanol, respectively; In step S2, when silanizing the glass fiber, the mass ratio of glass fiber to organic solvent is 1:15, and the volume percentage of silane coupling agent is 5% of the total volume of silane coupling agent and organic solvent; In step S3, 1g of terephthalaldehyde is dissolved in 50ml of EtOH; 1g of epoxy resin is dissolved in 30ml of EtOH; the molar ratio of epoxy groups to amine groups is 1.8:1; In step S6, the thickness of each layer of AGE powder is 0.4mm.

[0052] Comparative Example 1

[0053] AGE powder was prepared using the same method as in Example 1, except that the mass fraction of APTMS-GF added in step S4 was different. AGE composite materials were prepared by adding no APTMS-GF, 2%, 5%, 10%, and 15% APTMS-GF, respectively, and were designated as AGE-0, AGE-2, AGE-5, AGE-10, and AGE-15 composite materials.

[0054] Comparative Example 2

[0055] The pressure shell was prepared using the same method as in Example 1, except that CF and GF were not silanized. During the layup process, CF and GF / EP-PI powder were laid up in a single layer. Except for the first and last layers which were set as waterproof layers, the remaining layers were in the following order: one waterproof layer, one CF layer, one GF / EP-PI powder layer, and one CF layer. When the layup thickness reached the thickness of the AGCE pressure shell, the layup was stopped. Then, it was subjected to hot pressing to obtain the GF-reinforced EP-PI / CF pressure shell, denoted as GCE pressure shell.

[0056] Performance tests were conducted on the above embodiments and comparative examples:

[0057] (1) The APTMS-CF obtained in step S1 of Example 1 was subjected to XRD test, and the test results are as follows: Figure 5 As shown, the APTMS-CF and CF prepared in this paper exhibit obvious vibrational peaks at around 2θ = 26°. According to the Bragg equation, these are vibrational peaks generated by the 002 crystal plane of the carbon fiber. After the addition of APTMS, the characteristic peak of CF at around 2θ = 26° becomes significantly broader and lower, indicating that the number of active functional groups on the CF surface increases and its graphitization degree decreases. This shows that APTMS has been successfully adsorbed on the CF surface, indicating that APTMS-CF has been successfully prepared.

[0058] (2) Infrared spectroscopy was performed on the EP-PI material obtained in step S2 and the AGE powder material obtained in step S3 of Example 1. Figure 6 The infrared test results show that 1640cm -1 The vibrational peaks caused by the stretching of the imine group (C=N) were observed in both the AGE and EP-PI infrared spectra, proving the successful preparation of the EP-PI material. The AGE powder material showed vibrational peaks at 1080 cm⁻¹. -1 Infrared characteristic peaks generated by silicon-oxygen bond (Si-O) vibrations appeared at all locations, proving that APTMS-GF was successfully introduced into the EP-PI material. Meanwhile, after treatment with the silane coupling agent APTMS, the characteristic peak at 3400 cm⁻¹ in the AGE infrared curve was observed. -1 A broad peak caused by OH vibration appeared at 3960 cm⁻¹. -1The appearance of infrared characteristic peaks generated by methyl stretching vibrations proves that APTMS has been successfully attached to the surface of glass fibers.

[0059] (3) Testing the mechanical properties of the AGE composite materials prepared in Example 1 and Comparative Example 1: First, the AGE composite materials prepared in Example 1 and Comparative Example 1 were subjected to hot pressing treatment. Before hot pressing, the surface of the AGE composite material was impregnated with a solution containing imine bonds. The hot pressing temperature was set to 105℃ and the hot pressing time was 1 hour. The mechanical property test results of the obtained AGE composite materials are shown in Table 1. When the amount of APTMS-GF added was 10%, the tensile strength and tensile modulus of the material reached the maximum value, which were increased by 27% and 25% respectively compared with the substrate. At the same time, the impact strength of the material was increased by 32% compared with the substrate. In summary, adding 10% APTMS-GF can effectively enhance the mechanical properties of EP-PI materials.

[0060] Table 1 Mechanical properties of AGE composites with different contents of APTMS-GF

[0061]

[0062] (3) The AGE composite material of Comparative Example 1, after mechanical property testing, was subjected to scanning electron microscopy. The test results are as follows: Figure 7 As shown, it can be found that the diameter of APTMS-GF is in the range of 10-20 μm. Moreover, APTMS-GF fractured under external force at the fracture surface. This indicates that APTMS-GF with high strength and modulus plays an important role in bridging cracks and preventing crack propagation during the stress process of the material, thereby enhancing the mechanical properties of AGE material.

[0063] (4) Figure 8 The hydrostatic pressure test results are shown for the GCE sandwich pressure shell obtained in Comparative Example 2 and the biomimetic AGCE composite sandwich pressure shell obtained in Example 1, respectively. Before testing, the pressure shell needs to be end-capped, such as... Figure 4 As shown in the right figure, a rubber ring is added inside the end cap to prevent water from entering the pressure shell. Then, adhesive is applied to its surface to fix the end cap. Finally, epoxy resin is used to bond the bottom of the AGCE pressure shell to the end cap, with a bonding time of 24 hours. Figure 4 As shown, where Figure 4 (a) in the figure is the GCE sandwich pressure shell obtained in Comparative Example 2. Figure 4 (b) shows the AGCE composite sandwich pressure-resistant shell obtained in Example 1. The test results show that, compared to the GCE pressure-resistant shell, the biomimetic AGCE pressure-resistant shell designed in this invention has superior pressure resistance, increasing from 2.52 MPa to 5.02 MPa.

Claims

1. A biomimetic modified resin composite sandwich pressure hull characterized by, The unit interlayer comprises at least one unit interlayer which is stacked in the order of one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, and one layer of prepreg; the prepreg is obtained by impregnating silanized carbon fibers with a reaction solution of imine modified epoxy resin, and silanized glass fibers are added to the reaction solution; the AGE powder is obtained by blending silanized glass fibers and imine modified epoxy resin powder; and the unit interlayer is provided with waterproof layers on both sides.

2. The biologically modified resin composite sandwich pressure hull of claim 1, wherein, The thickness of each layer of AGE powder is 0.2-0.4 mm.

3. A method of making a biomimetic modified resin composite sandwich pressure hull according to claim 1, characterized in that, The method comprises the following steps: (1) silanizing carbon fibers and glass fibers respectively to obtain silanized carbon fibers and silanized glass fibers; (2) preparing an imine modified epoxy resin material; (3) crushing the imine modified epoxy resin material and blending it with silanized glass fibers in a solvent, and then filtering and drying to obtain glass fiber reinforced imine modified epoxy resin powder, denoted as AGE powder; (4) adding silanized glass fibers to a reaction solution for preparing the imine modified epoxy resin material, and then impregnating silanized carbon fibers to obtain prepreg; (5) performing layering and winding on a mold in the order of one layer of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, two layers of prepreg, one layer of AGE powder, and one layer of prepreg, and setting waterproof layers on the first layer and the last layer to obtain a bionic modified resin composite interlayer pressure shell winding sample, and then performing vacuum hot pressing, demolding, and obtaining a bionic modified resin composite interlayer pressure shell.

4. The method of claim 3, wherein the method further comprises the step of: In step (3), the mass ratio of the silanized glass fibers to the imine modified epoxy resin material powder is 1:9-1:

19.

5. The method of claim 3, wherein the method further comprises the step of: In step (4), the mass of the silanized glass fibers accounts for 5%-10% of the mass of the reaction solution for preparing the imine modified epoxy resin material.

6. The method of claim 3, wherein the method further comprises the step of: In step (2), the process for preparing the imine modified epoxy resin material is as follows: adding diamine for prepolymerization to a dialdehyde ethanol solution to perform prepolymerization reaction and form solution 1; dissolving diamine and triamine for crosslinking in an ethanol solution to form solution 2; mixing solution 1, solution 2, and an epoxy resin ethanol solution to perform mixing reaction and form an epoxy resin solution containing an imine bond, and then drying to obtain an imine modified epoxy resin material; The ratio of amine groups to aldehyde groups in the solution 1 is 1:3-2:3, and the molar ratio of epoxy groups to amine groups is 1.5:1-1.8:

1.

7. The method of claim 6, wherein the method further comprises the step of: The mass concentration of the epoxy resin ethanol solution is 4.05-5.9%, and the mass concentration of the dialdehyde ethanol solution is 2.5-3.5%.

8. The method of claim 6, wherein the method further comprises the step of: The dialdehyde is at least one selected from the group consisting of p-xylylene dialdehyde, m-xylylene dialdehyde, and glutaraldehyde; the diamine for prepolymerization is at least one selected from the group consisting of diethylene triamine and / or triethylenetetramine; the diamine for crosslinking is at least one selected from the group consisting of triethylenetetramine, ethylenediamine, polyether amine, and diethylene triamine; and the triamine is tri(2-aminoethyl)amine.

9. The method of making a biomimetic modified resin composite sandwich pressure hull of claim 3, wherein, In step (5), the hot pressing temperature is set to 90-105℃, the hot pressing time is 4-6 h, the holding temperature is 70-80℃, and the holding time is 4-5 h.

10. The method of making a biomimetic modified resin composite sandwich pressure hull of claim 3, wherein, In step (1), when the carbon fibers are silanized, the volume percentage of water and silane coupling agent in the total volume of water, silane coupling agent and anhydrous ethanol is 2%-5%; when the glass fibers are silanized, the mass ratio of glass fibers to organic solvent is 1:10-1:15, and the volume percentage of silane coupling agent in the total volume of silane coupling agent and organic solvent is 2-5%.

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