Composite material pressure-resistant cabin section corrosion-resistant protective layer and forming method

Abstract

The invention relates to a composite pressure-resistant cabin section corrosion-resistant protective layer and a forming method. Comprising the following steps: coating the surface of a composite pressure-resistant cabin section with epoxy resin to form a waterproof layer; mixing polyurea resin and a volatile solvent type polymerization inhibitor to obtain impregnation liquid, impregnating continuous fibers or fabrics in the impregnation liquid, after impregnation, drawing and winding the continuous fibers or fabrics on the waterproof layer to form a polyurea continuous fiber reinforced layer, and irradiating in a thermal irradiation manner in the winding process; and spraying polyurea on the surface of the polyurea continuous fiber reinforced layer, heating and curing, forming a polyurea layer on the polyurea continuous fiber reinforced layer, and solving the problems that the existing polyurea protective layer is likely to collide during laying / recycling and underwater cruising, so that the corrosion resistance of the composite material pressure-resistant cabin section is influenced, and the service life of the composite material pressure-resistant cabin section is greatly prolonged through the design of the molding method of the composite material pressure-resistant cabin section corrosion-resistant protective layer. The polyurea protective layer is peeled, damaged and the like, and the connectivity between the polyurea protective layer and the composite material pressure-resistant cabin section is invalid.

Description

Technical Field

[0001] The invention relates to the technical field of composite material anti-corrosion layers, and in particular to a composite material pressure cabin section anti-corrosion protective layer and a molding method thereof. Background Art

[0002] At present, AUV / UUF has been widely used in ocean exploration. Composite pressure hulls have better weight reduction effects than metal hulls and are widely used in this technical field. At present, paint or soft polyurea is usually used as a protective layer to protect the hull. The main purpose is to reduce the performance degradation caused by water absorption of the composite material, as well as other negative effects in seawater, such as the attachment of marine organisms. The paint layer is generally not effective in preventing the composite material from absorbing water. This is because the main component of the paint is epoxy or other types of resins that solidify to form a relatively dense resin layer. Under long-term immersion in seawater, water will penetrate the paint layer and expand inward. Polyurea protection is a protective layer material that is currently more widely used in the marine field. Composite pressure hulls with polyurea protective layers have been subjected to long-term sea trials and are a protective material with better effects.

[0003] However, the polyurea protective layer also has its shortcomings. For example, the polyurea protective layer may be bumped during deployment / recovery and underwater cruising, causing the polyurea protective layer to peel and be damaged, resulting in delamination and debonding between the polyurea protective layer and the composite pressure section, and protection failure. Therefore, how to effectively improve the connection performance between the polyurea protective layer and the composite pressure section is one of the main problems faced by various research institutions. At present, the bonding performance between the composite material and the polyurea protective layer can be improved to a certain extent through polyurea modification, but it still cannot achieve the expected goal.

[0004] CN205392916U discloses a fiber-reinforced resin-based composite material cylinder anti-impact protection structure, including a fiber-reinforced resin-based composite material cylinder, a primer sprayed on the surface of the fiber-reinforced resin-based composite material cylinder and an anti-impact protective layer arranged on the primer, wherein the anti-impact protective layer is a polyurea protective layer. By spraying a polyurea coating on the outer surface of the fiber-reinforced resin-based composite material cylinder, the problem of deformation and damage of the cylinder when impacted can be effectively solved. At the same time, the polyurea coating has the advantages of weather resistance, UV resistance, strong adhesion, good corrosion resistance, high mechanical strength, etc., and is widely used in the anti-impact protection of resin-based composite material cylinders. However, the sprayed polyurea coating is still easily damaged after being bumped, and cannot meet the requirements of long-term use underwater, which will lead to performance degradation caused by water absorption of local materials of the pressure-resistant shell.

[0005] Therefore, in view of the above problems, the present invention urgently needs to provide a composite material pressure cabin section corrosion resistant protective layer and a molding method. Summary of the invention

[0006] The purpose of the present invention is to provide a composite material pressure-resistant cabin section corrosion-resistant protective layer and a molding method. The design of the composite material pressure-resistant cabin section corrosion-resistant protective layer molding method can solve the technical problem that the existing polyurea protective layer may be bumped during deployment / recovery and underwater cruising, resulting in peeling and damage of the polyurea protective layer, resulting in delamination and debonding of the polyurea protective layer and the composite material pressure-resistant cabin section, and protection failure.

[0007] The present invention provides a method for forming a corrosion-resistant protective layer of a composite material pressure cabin section, comprising the following steps: S1) coating epoxy resin on the surface of the composite pressure-resistant cabin section to form a waterproof layer; S2) mixing a polyurea resin and a volatile solvent-type inhibitor to obtain an impregnation solution, impregnating the continuous fiber or fabric in the impregnation solution, and after impregnation, pulling and winding the continuous fiber or fabric on the waterproof layer to form a polyurea continuous fiber reinforcement layer, and irradiating the layer by thermal radiation during the winding process; S3) spraying polyurea on the surface of the polyurea continuous fiber reinforcement layer, heating and curing, and forming a polyurea layer on the polyurea continuous fiber reinforcement layer.

[0008] Preferably, in step S2, the impregnated continuous fiber or fabric is first irradiated to the waterproof layer before being wound around the waterproof layer, so that the surface temperature of the waterproof layer reaches 40-50°C, and the continuous fiber or fabric is wound and continuously subjected to thermal irradiation.

[0009] Preferably, the pulling speed in step S2 is 0.5-1.0 m / s.

[0010] Preferably, the volatile solvent-type inhibitor comprises one of ethyl acetate, acetone and anhydrous ethanol.

[0011] Preferably, the continuous fiber or fabric winding angle is ±45°.

[0012] Preferably, the thickness of the polyurea continuous fiber reinforcement layer is 0.5-2 mm.

[0013] Preferably, the thickness of the waterproof layer is 1-2 mm; the thickness of the polyurea layer is 0.5-2 mm.

[0014] Preferably, in step S2, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed, and after the surface of the polyurea continuous fiber reinforcement layer is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

[0015] Preferably, the curing temperature in step S3 is 40-50°C.

[0016] The present invention also provides a composite material pressure-resistant cabin section corrosion-resistant protective layer obtained by the composite material pressure-resistant cabin section corrosion-resistant protective layer molding method as described in any of the above-mentioned methods, wherein the surface of the composite material pressure-resistant cabin section comprises a waterproof layer, a polyurea continuous fiber reinforcement layer and a polyurea layer from the inside to the outside.

[0017] Compared with the prior art, the composite material pressure cabin section corrosion resistant protective layer and molding method provided by the present invention have the following improvements: 1. The present invention proposes a method for forming a corrosion-resistant protective layer for a composite pressure cabin section, wherein polyurea is impregnated with continuous fibers or other reinforcing fabrics, and the polyurea is wound around the outer surface of the composite pressure cabin section to form a polyurea continuous fiber reinforced layer. The polyurea continuous fiber reinforced layer obtained by this method has good continuity. Even when impacted, the composite pressure cabin section will not be directly exposed to the outside due to the presence of the continuous reinforcement, thereby achieving the purpose of effective protection.

[0018] 2. The present invention uses a wet winding method to add polyurea to the glue tank, and adds a solvent-based inhibitor to ensure that the polyurea system in the glue tank cannot self-cure. The continuous fiber or fabric is introduced into the glue tank through a tension roller to complete the impregnation of the continuous fiber or fabric with the polyurea, and the continuous fiber or fabric is wound onto the composite pressure cabin according to a preset line shape; the polyurea continuous fiber reinforcement layer has a certain thickness, usually 0.5-2mm. After winding, if the inhibitor fails to completely volatilize, voids will be generated during the subsequent polyurea curing. The presence of these voids will cause the hardness of the polyurea to decrease, and the voids will also become weak points for water to enter the composite material through the polyurea layer. Therefore, in order to allow the polyurea to cure completely without voids, the inhibitor must be completely volatilized to make the polyurea layer projection window time controllable. In the molding process, a volatile solvent-based inhibitor is used. This type of inhibitor can be quickly removed from the polyurea after heating, achieving the purpose of controllable reaction window. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The method for forming the corrosion-resistant protective layer of the composite material pressure cabin section described in the background technology; Figure 2 It is the corrosion-resistant protective layer of the composite material pressure cabin section described in the present invention; Description of reference numerals: 1. Composite material pressure-resistant compartment section; 2. Waterproof layer; 3. Polyurea continuous fiber reinforcement layer; 4. Polyurea layer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the present invention provides a method for forming a corrosion-resistant protective layer of a composite material pressure cabin section, comprising the following steps: S1) coating epoxy resin on the surface of the composite pressure-resistant cabin section 1 to form a waterproof layer 2; S2) mixing a polyurea resin and a volatile solvent-type polymerization inhibitor to obtain an impregnation liquid, impregnating the continuous fiber or fabric in the impregnation liquid, and after impregnation, pulling and winding the continuous fiber or fabric on the waterproof layer 2 to form a polyurea continuous fiber reinforcement layer 3, and irradiating the continuous fiber or fabric by thermal radiation during the winding process; S3) spraying polyurea on the surface of the polyurea continuous fiber reinforcement layer 3, heating and curing, and forming a polyurea layer 4 on the polyurea continuous fiber reinforcement layer.

[0023] The present invention proposes a method for forming a corrosion-resistant protective layer for a composite pressure cabin section, wherein polyurea is impregnated with continuous fibers or other reinforcing fabrics, and the polyurea is wound around the outer surface of the composite pressure cabin section 1 to form a polyurea continuous fiber reinforced layer. The polyurea continuous fiber reinforced layer obtained by this method has good continuity. Even when impacted, the composite pressure cabin section will not be directly exposed to the outside due to the presence of the continuous reinforcement, thereby achieving the purpose of effective protection.

[0024] The present invention adds polyurea and solvent-based polymerization inhibitors to the glue tank by wet winding, ensures that the polyurea system in the glue tank cannot self-cure, introduces continuous fiber or fabric into the glue tank through a tension roller, completes the impregnation of continuous fiber or fabric with polyurea, and winds the continuous fiber or fabric onto the composite pressure cabin according to a preset line shape; the polyurea continuous fiber reinforcement layer has a certain thickness, usually 0.5-2mm. After winding, if the polymerization inhibitor fails to completely volatilize, voids will be generated during the subsequent polyurea curing. The presence of these voids will cause the hardness of the polyurea to decrease, and the voids will also become weak points for water to enter the composite material through the polyurea layer. Therefore, in order to allow the polyurea to cure completely without voids, the polymerization inhibitor must be completely volatilized, so that the polyurea layer projection window time is controllable. In the molding process, a volatile solvent-based polymerization inhibitor is used. This type of polymerization inhibitor can be quickly removed from the polyurea after heating, achieving the purpose of controllable reaction window.

[0025] The present invention designs a specific winding angle through a linear design, and it is recommended to use ±45°, which can more effectively protect against impact loads.

[0026] In step S2 of the present invention, the impregnated continuous fiber or fabric is first irradiated to the waterproof layer 2 before being wound around the waterproof layer 2, so that the surface temperature of the waterproof layer 2 reaches 40-50°C, and the continuous fiber or fabric is wound and continuously subjected to thermal irradiation.

[0027] Polyurea is sprayed on the outside of the polyurea continuous fiber reinforcement layer, and heated and cured to form a polyurea layer 4 on the polyurea continuous fiber reinforcement layer, which can achieve a waterproof effect.

[0028] The continuous fibers of the present invention are carbon fibers or glass fibers, preferably glass fibers.

[0029] The thickness of the polyurea layer 4 of the present invention is ≤2 mm.

[0030] The pulling speed in step S2 of the present invention is 0.5-1.0 m / s. By setting the pulling speed, the time for the inhibitor to fully volatilize is guaranteed without affecting the production efficiency.

[0031] In some embodiments, the volatile solvent-type inhibitor is selected from one of ethyl acetate, acetone and anhydrous ethanol, preferably ethyl acetate.

[0032] In some embodiments, the thickness of the polyurea continuous fiber reinforced layer 3 is 0.5-2 mm. Preferably, the thickness of the polyurea continuous fiber reinforced layer 3 is 1.0 mm, which protects the composite pressure cabin section without increasing the overall weight too much.

[0033] In some embodiments, the thickness of the waterproof layer 2 is 1-2 mm, preferably, the thickness of the waterproof layer 2 is 1.5 mm; the thickness of the polyurea layer 4 is 0.5-2 mm, preferably, the thickness of the polyurea layer is 1.0 mm.

[0034] Specifically, in step S2, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed. After the surface of the polyurea continuous fiber reinforcement layer 3 is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

[0035] Specifically, the curing temperature in step S3 is 40-50°C.

[0036] The present invention also provides a composite pressure-resistant cabin section corrosion-resistant protective layer obtained by the composite pressure-resistant cabin section corrosion-resistant protective layer molding method as described in any of the above-mentioned methods, wherein the surface of the composite pressure-resistant cabin section 1 comprises, from the inside to the outside, a waterproof layer 2, a polyurea continuous fiber reinforcement layer 3 and a polyurea layer 4.

[0037] The present invention adds a polyurea continuous fiber reinforcement layer 3 between the waterproof layer 2 and the polyurea layer 4 through the corrosion-resistant protective layer of the composite pressure cabin section. The presence of the continuous reinforcement body can prevent the composite pressure cabin section from being directly exposed to the outside when it is impacted, thereby achieving the purpose of effective protection.

[0038] Embodiment 1 A method for forming a corrosion-resistant protective layer of a composite pressure cabin section comprises the following steps: 101) coating epoxy resin on the surface of the composite pressure-resistant cabin section 1 to form a waterproof layer 2; 102) Mixing a polyurea resin and a volatile solvent-type inhibitor to obtain an impregnation solution, impregnating the continuous fiber or fabric in the impregnation solution, and after impregnation, pulling and winding the continuous fiber or fabric on the waterproof layer 2 to form a polyurea continuous fiber reinforcement layer 3, and irradiating the layer by thermal radiation during the winding process; 103) Spraying polyurea on the surface of the polyurea continuous fiber reinforcement layer 3, heating and curing, and forming a polyurea layer 4 on the polyurea continuous fiber reinforcement layer.

[0039] In step 102, before the impregnated continuous fiber or fabric is wound around the waterproof layer 2, the waterproof layer 2 is first irradiated so that the surface temperature of the waterproof layer 2 reaches 40°C. The continuous fiber or fabric is wound and continuously subjected to thermal irradiation.

[0040] The continuous fibers in this embodiment are glass fibers.

[0041] The thickness of the polyurea layer 4 of the present invention is 2 mm.

[0042] The pulling speed in step 102 in this embodiment is 0.5 m / s.

[0043] The volatile solvent-type polymerization inhibitor in this embodiment is ethyl acetate.

[0044] In this embodiment, the thickness of the polyurea continuous fiber reinforcement layer 3 is 2 mm.

[0045] In this embodiment, the thickness of the waterproof layer 2 is 1 mm.

[0046] In step S2 of this embodiment, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed. After the surface of the polyurea continuous fiber reinforcement layer 3 is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

[0047] In this embodiment, the curing temperature in step S3 is 40°C.

[0048] The test piece was prepared by the above method, and a pendulum impact test was carried out according to ASTM D256 standard. The pendulum energy was 120 J, the impact speed was 3.8 m / s, and after one impact, the test piece was immersed in water for 5 days, and the water absorption rate, the compression strength retention rate, the bending strength retention rate and the interlaminar shear force retention rate of the test piece after immersion for 5 days were calculated. The surface of the test piece was observed, as shown in Table 1.

[0049] Embodiment 2 The difference between this embodiment and the first embodiment lies in step 102. In this embodiment, the impregnated continuous fiber or fabric is first irradiated to the waterproof layer 2 before being wound around the waterproof layer 2, so that the surface temperature of the waterproof layer 2 reaches 50°C, and the continuous fiber or fabric is wound and continuously subjected to heat irradiation.

[0050] The continuous fibers in this embodiment are glass fibers.

[0051] The thickness of the polyurea layer 4 of the present invention is 2 mm.

[0052] The pulling speed in step 102 in this embodiment is 1.0 m / s.

[0053] The volatile solvent-type polymerization inhibitor in this embodiment is acetone.

[0054] In this embodiment, the thickness of the polyurea continuous fiber reinforcement layer 3 is 0.5 mm.

[0055] In this embodiment, the thickness of the waterproof layer 2 is 2 mm.

[0056] In step S2 of this embodiment, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed. After the surface of the polyurea continuous fiber reinforcement layer 3 is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

[0057] In this embodiment, the curing temperature in step S3 is 50°C.

[0058] The test piece was prepared according to the above method, and the test method was the same as that in Example 1, see Table 1.

[0059] Embodiment 3 The difference between this embodiment and the first embodiment lies in step 102. In this embodiment, the impregnated continuous fiber or fabric is first irradiated to the waterproof layer 2 before being wound around the waterproof layer 2, so that the surface temperature of the waterproof layer 2 reaches 45°C, and the continuous fiber or fabric is wound and continuously subjected to heat irradiation.

[0060] The continuous fibers in this embodiment are glass fibers.

[0061] The thickness of the polyurea layer 4 of the present invention is 2 mm.

[0062] The pulling speed in step 102 in this embodiment is 0.75 m / s.

[0063] The volatile solvent-type polymerization inhibitor in this embodiment is anhydrous ethanol.

[0064] In this embodiment, the thickness of the polyurea continuous fiber reinforcement layer 3 is 1.0 mm.

[0065] In this embodiment, the thickness of the waterproof layer 2 is 1.5 mm.

[0066] In step S2 of this embodiment, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed. After the surface of the polyurea continuous fiber reinforcement layer 3 is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

[0067] In this embodiment, the curing temperature in step S3 is 45°C.

[0068] The test piece was prepared according to the above method, and the test method was the same as that in Example 1, see Table 1.

[0069] Comparative Example 1 The difference from Example 1 is step 102. In this comparative example, the continuous fiber or fabric is impregnated with polyurea resin, and after impregnation, it is pulled and wound on the waterproof layer 2 to form a polyurea continuous fiber reinforced layer 3 (there is no step of irradiating the waterproof layer 2, and there is no thermal irradiation process during the winding process of the polyurea continuous fiber).

[0070] The test pieces were prepared and the testing method was the same as in Example 1, see Table 1.

[0071] Comparative Example 2 The difference from Example 1 is step 102. In this comparative example, the continuous fibers or fabrics are impregnated with polyurea resin, and after impregnation, they are pulled and wound on the waterproof layer 2 to form a polyurea continuous fiber reinforcement layer 3. There is a heat irradiation process during the polyurea continuous fiber winding process, but there is no heating step for the waterproof layer 2.

[0072] The test pieces were prepared and the testing method was the same as in Example 1, see Table 1.

[0073] Comparative Example 3 The difference from the first embodiment is that the pulling speed is 1.1 m / s.

[0074] The test piece was prepared according to the above method, and the test method was the same as that in Example 1, see Table 1.

[0075] Comparative Example 4 The difference from the first embodiment is that the pulling speed is 0.4 m / s.

[0076] The test piece was prepared according to the above method, and the test method was the same as that in Example 1, see Table 1.

[0077] Comparative Example 5 The difference from the first embodiment is that there is no polyurea continuous fiber reinforcement layer 3, and the thickness of the polyurea layer is 4 mm.

[0078] The test piece was prepared according to the above method, and the test method was the same as that in Example 1, see Table 1.

[0079] Table 1 Physical properties of test pieces

[0080] The present invention adds a polyurea continuous fiber reinforcement layer 3 between the waterproof layer 2 and the polyurea layer 4 through the corrosion-resistant protective layer of the composite pressure cabin section. The presence of the continuous reinforcement body can prevent the composite pressure cabin section from being directly exposed to the outside when it is impacted, thereby achieving the purpose of effective protection.

[0081] Compared with Example 1, the water absorption rate of Comparative Example 1 increases, and at the same time, the compression strength retention rate, bending strength retention rate and interlayer shear retention rate after immersion for 5 days decrease. It can be seen that the heating of the waterproof layer and the thermal radiation during the winding process have an important influence on the overall performance. The temperature does not meet the requirements, and the inhibitor cannot be fully volatilized, which affects the overall mechanical properties of the specimen and has a high water absorption rate.

[0082] Before the polyurea continuous fiber is wound, the waterproof layer 2 is first thermally irradiated, and thermal irradiation is also performed during the polyurea continuous fiber winding process, so that the inhibitor can be completely volatilized, ensuring that no inhibitor remains and no gaps are generated when the polyurea is cured, thereby ensuring the overall strength and density of the polyurea continuous fiber reinforced layer 3 and preventing water from entering the composite material through the polyurea layer.

[0083] Compared with Example 1, the water absorption rate of Comparative Example 2 increases, and the compression strength retention rate, bending strength retention rate and interlaminar shear retention rate after immersion for 5 days are slightly reduced. It can be seen that heating the waterproof layer during the preparation process also has a certain impact on the overall performance of the material. The temperature of the waterproof layer cannot be reached, and the inhibitor wrapped in the waterproof layer cannot be fully volatilized, which will affect the overall mechanical properties, and at the same time, the polyurea continuous fiber reinforcement layer will produce gaps, resulting in a high increase in water absorption.

[0084] Compared with Example 1, the traction speed of Comparative Example 3 is set to 1.1 m / s, which is higher than that of Example 1, but the water absorption rate is greater than that of Example 1. The compression strength retention rate, bending strength retention rate and interlaminar shear retention rate after immersion for 5 days are lower than those of Example 1. It can be seen that the setting of the traction speed plays a crucial role in the density of the polyurea continuous fiber reinforced layer 3.

[0085] Compared with Example 1, the traction speed of Comparative Example 4 is set to a traction speed of 0.4 m / s. Compared with Example 1, the traction speed is lower than that of Example 1, the water absorption rate is greater than that of Example 1, the compression strength retention rate, the bending strength retention rate and the interlaminar shear retention rate after immersion for 5 days are lower than those of Example 1, the traction speed is less than 0.5 m / s, the polyurea that has been constructed is cured, while the solvent of the polyurea that has not been constructed is volatilized during the process, and it is a semi-solidified state that is attached to the surface of the composite material, which will also cause a decrease in performance.

[0086] Compared with Example 1, Comparative Example 5 does not have a polyurea continuous fiber reinforcement layer 3, and simply increases the thickness of the polyurea layer to 4 mm. Although a good water absorption rate can be guaranteed, the compression strength retention rate, bending strength retention rate and interlaminar shear retention after immersion for 5 days without the polyurea continuous fiber reinforcement layer 3 are reduced by 27%, 20% and 25%, respectively (the embodiment only decreases by 5-6%), indicating that simply adding a polyurea layer has limited improvement on long-term mechanical properties. At the same time, after impact, the carbon fiber layer is exposed and cannot meet the impact resistance requirements.

[0087] Based on the above analysis, the design of the polyurea continuous fiber reinforcement layer 3 of the present invention plays a key role in resisting stress degradation in aquatic environments.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for forming a corrosion-resistant protective layer of a composite pressure cabin section, characterized in that: The steps include: S1) coating epoxy resin on the surface of the composite pressure-resistant cabin section (1) to form a waterproof layer (2); S2) mixing a polyurea resin and a volatile solvent-type inhibitor to obtain an impregnation liquid, impregnating the continuous fibers or fabrics in the impregnation liquid, and after impregnation, pulling and winding the continuous fibers or fabrics on the waterproof layer (2) to form a polyurea continuous fiber reinforcement layer (3), wherein the continuous fibers or fabrics are irradiated by heat during the winding process; S3) spraying polyurea on the surface of the polyurea continuous fiber reinforcement layer (3), heating and curing, and forming a polyurea layer (4) on the polyurea continuous fiber reinforcement layer.

2. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: In step S2, before the impregnated continuous fiber or fabric is wound around the waterproof layer (2), the waterproof layer (2) is first irradiated so that the surface temperature of the waterproof layer (2) reaches 40-50° C. The continuous fiber or fabric is wound and thermal irradiation is continued.

3. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The pulling speed in step S2 is 0.5-1.0 m / s.

4. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The volatile solvent type inhibitor includes one of ethyl acetate, acetone and anhydrous ethanol.

5. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The continuous fiber or fabric winding angle is ±45°.

6. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The thickness of the polyurea continuous fiber reinforcement layer (3) is 0.5-2 mm.

7. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The thickness of the waterproof layer (2) is 1-2 mm; the thickness of the polyurea layer (4) is 0.5-2 mm.

8. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: In step S2, after the impregnated continuous fibers or fabrics are wound, the polyurea continuous fiber reinforcement layer is observed. When the surface of the polyurea continuous fiber reinforcement layer (3) is not sticky and no impregnation liquid falls off, the product is transferred to a curing furnace for curing.

9. The method for forming a corrosion-resistant protective layer of a composite pressure cabin section according to claim 1, characterized in that: The curing temperature in step S3 is 40-50°C.

10. A composite material pressure cabin section corrosion resistant protective layer obtained by the composite material pressure cabin section corrosion resistant protective layer forming method according to any one of claims 1 to 9, characterized in that: The surface of the composite pressure-resistant cabin section (1) comprises, from the inside to the outside, a waterproof layer (2), a polyurea continuous fiber reinforcement layer (3) and a polyurea layer (4).

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