Marine salt mist resistant composite material air pipe closing device and manufacturing method thereof

Abstract

The invention relates to a marine salt mist resistant composite material air pipe closing device and a manufacturing method thereof. The marine salt mist resistant composite material air pipe closing device comprises an outer pipe body, an inner pipe body, a connecting flange, a floating ball sealing assembly and a sealing piece. The floating ball sealing assembly is arranged in the inner pipe body in an up-down floating mode and used for closing or opening the air guiding opening under air pressure, enters a cavity of the inner pipe body from the air inlet, then enters a cavity between the inner wall of the outer pipe body and the outer wall of the inner pipe body through the air guiding opening in the top of the inner pipe body and finally enters an air pipe through a connecting flange connected with the bottom end of the outer pipe body. An airflow channel is formed; a sealing piece is arranged between the inner wall of the top end of the outer pipe body and the outer wall of the top end of the inner pipe body and used for being in attached sealing with the floating ball sealing assembly when the floating ball sealing assembly floats upwards. The outer pipe body and the inner pipe body are made of a multi-layer composite material for achieving quasi-isotropic mechanics. The device is resistant to marine environment erosion, light in weight, convenient to install and suitable for long-term use, and water resistance, fire resistance and insect prevention of the ship under any working conditions are fully guaranteed.

Description

Technical Field

[0001] The invention relates to the field of marine ventilation equipment design, and in particular to a marine salt spray resistant composite material air pipe closing device and a manufacturing method thereof. Background Art

[0002] Air pipe heads are used at the outer ends of ventilation channels in various cabins of various types of ships to maintain air circulation inside and outside the ventilation channels and prevent the pressure in the cabin from being too high or too low. When the ship is tilted or encounters wind and waves, the air pipe head must be able to be closed in time to prevent water from entering the cabin. This function is usually achieved by using the floating ball inside the air pipe head and the corresponding sealing ring. When water flows submerge the air inlet of the air pipe head, the floating ball rises with the water flow under the action of the buoyancy of seawater and fits with the sealing ring, closing the air inlet and the ventilation channel to prevent water from entering.

[0003] There are some problems in the use of traditional marine air pipe heads. The metal marine air pipe heads will be corroded by seawater during the navigation of the ship, resulting in corrosion and damage to the metal. As a result, there will be rust residue inside the air pipe head, which will block the pipeline and affect the pressure balance. The sealing ring will fall off due to metal corrosion, and the metal float will also fail due to corrosion, which will directly lead to the failure of the air pipe head, seriously affecting the navigation safety of the ship and the health of the crew, and causing a lot of unnecessary economic losses.

[0004] Metals are usually denser, which can cause unnecessary burdens during ship navigation, especially for pipes with larger diameters, which often require multiple people to work together. Summary of the invention

[0005] In response to the above problems, a marine salt spray resistant composite air pipe closing device and a manufacturing method thereof were proposed, and a fiber resin system with long-term resistance to the marine environment was prepared. According to the material properties, a new breathable cap structure that can be mass-produced at low cost was designed, which is resistant to the erosion of the marine environment, lightweight and easy to install, and suitable for long-term use.

[0006] The technical solution of the present invention is: a marine salt spray resistant composite air pipe closing device, comprising: an outer tube body, the top end of which is closed, the bottom end is open and fixed to the upper end of the connecting flange by a positioning pin, and the two non-adjacent ends are symmetrically provided with air inlets respectively;

[0007] The inner tube body is arranged inside the outer tube body, and the bottom end of the inner tube body is closed, the top end has an air guide port, and the two ends of the non-adjacent openings around it are respectively connected to the air inlets at the two ends of the outer tube body;

[0008] A connecting flange, the lower end of which is fixedly connected to the air pipe;

[0009] The floating ball sealing assembly is arranged in the inner tube body so as to float up and down, and is used to close or open the air guide port under air pressure, enter the inner tube body cavity from the air inlet, and then pass through the air guide port at the top of the inner tube body to the cavity between the inner wall of the outer tube body and the outer wall of the inner tube body, and finally pass through the connecting flange connected to the bottom end of the outer tube body to the air pipe to form an air flow channel;

[0010] and a sealing member disposed between the top inner wall of the outer tube body and the top outer wall of the inner tube body, and used for sealing against the float seal assembly when the float seal assembly floats;

[0011] in;

[0012] The outer tube body and the inner tube body are made of a multi-layer composite material to achieve quasi-isotropic mechanics;

[0013] The connecting flange is made of 316L stainless steel.

[0014] Preferably, the air inlets are symmetrically arranged on both sides of the outer tube body, and each of them sequentially comprises an inner tube body support plate, a filter screen bottom plate, a filter screen pressing plate and a filter screen cover plate of the same size;

[0015] The inner tube support plate has a support opening at the center thereof for accommodating the open end of the inner tube;

[0016] The filter screen bottom plate has a filter screen arranged at the center thereof;

[0017] The filter screen pressing plate has a through hole at the center thereof that matches the size of the filter screen;

[0018] The filter screen cover is a convex plate with the middle bulging outwards;

[0019] The filter cover plate, filter pressure plate, filter bottom plate and the inner tube support plate are fixedly connected to the outer tube body in sequence from outside to inside through fixing parts. The middle part of the filter cover plate protrudes outward to form an air inlet cavity between the filter pressure plate. The air inlet cavity is connected to the inner tube body cavity through the through hole of the filter pressure plate and the filter of the filter bottom plate.

[0020] Preferably, the bottom end of the sealing member is in contact with the inner edge of the air guide port and has a lip.

[0021] Preferably, the float seal assembly is a spherical floating seal body made of PE material.

[0022] A method for manufacturing a marine salt spray resistant composite material air pipe closing device, the steps are as follows:

[0023] Prepare the inner tube body and outer tube body molds in advance, and lay the aramid fiber layer → unidirectional prepreg layer → three-dimensional woven carbon fiber layer → PTFE reinforced coating in sequence from the inside to the outside to form a quasi-isotropic layer;

[0024] A flame retardant resin system with brominated vinyl resin as the main agent and methyl ethyl ketone peroxide as the curing agent was injected into the mold by vacuum infusion process at a pressure of 0.09 MPa for 2 hours.

[0025] Then, the inner tube body and the outer tube body blank are made by curing at room temperature for 24 hours and curing at 60°C for 5 hours.

[0026] The inner tube body and the outer tube body blank are sandblasted, the end faces of the connecting flanges are polished, and then the connecting surfaces are cleaned;

[0027] A layer of epoxy structural adhesive with a thickness of 0.15-0.2mm is applied to the connection surface. A cylindrical pin is also provided between the connection flange and the outer tube body. After the inner tube body, the outer tube body and the connection flange are assembled, they are placed in an oven at 60°C for 4 hours to complete curing to form a tube head assembly;

[0028] The float seal assembly, seal and air inlet are installed to the pipe head assembly to form a marine salt spray resistant composite air pipe closure device.

[0029] Furthermore, the main agent is a brominated vinyl resin, and the curing agent is a flame retardant resin system of methyl ethyl ketone peroxide. The flame retardant resin system of methyl ethyl ketone peroxide is prepared by using diphenylmethane diisocyanate, polypropylene glycol, hydroxyethyl methacrylate and copper-iron alloy as raw materials to synthesize polyurethane acrylate, which is then blended with the copper-iron alloy and vinyl ester resin, and a modified vinyl ester resin containing a polyurethane acrylate block is obtained through a free radical copolymerization reaction under the action of an initiator.

[0030] Furthermore, the flame retardant resin system formula and process parameters are as follows:

[0031] 1) Synthetic polyurethane acrylate:

[0032] Diphenylmethane diisocyanate: 0.1ml,

[0033] Polypropylene glycol (molecular weight about 2000): 0.05ml,

[0034] Hydroxyethyl methacrylate: 0.05ml,

[0035] Reaction temperature: 75°C,

[0036] Reaction time: 2 hours;

[0037] 2) Blending and copolymerization:

[0038] Polyurethane acrylate: Step 1) Synthesis amount,

[0039] Copper iron alloy powder: 5% w / w, relative to the weight of polyurethane acrylate,

[0040] Vinyl ester resin: 95% w / w, relative to the weight of polyurethane acrylate,

[0041] Initiator: 1% w / w, relative to the weight of vinyl ester resin,

[0042] Reaction temperature: 90°C,

[0043] Reaction time: 3 hours;

[0044] 3) Post-processing:

[0045] Cooling rate: Natural cooling at room temperature,

[0046] Curing time: 24 hours.

[0047] The beneficial effects of the present invention are: the marine salt spray resistant composite air pipe closing device of the present invention and the manufacturing method thereof, composite materials generally have higher resistance to seawater and salt spray corrosion because they do not contain metal elements, which reduces the need for maintenance and extends the service life; composite materials generally have a lower density, and the specific strength (strength per unit mass) of composite materials is generally higher than that of metals, which means that structures of the same strength can be designed but lighter; this new design breaks through the design concept of traditional products in terms of structure and material, and has a simple structure as a whole, is light in weight, is corrosion-resistant, is easy to install, and has good ventilation performance, which can fully ensure that the ship is waterproof, fireproof, and insect-proof under any working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic structural diagram of an embodiment of a marine salt spray resistant composite material air pipe closing device of the present invention;

[0049] Figure 2 for Figure 1 AA cross-section diagram;

[0050] Figure 3 It is a partial structural diagram of the sealing member in the marine salt spray resistant composite material air pipe closing device of the present invention. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0052] like Figure 1 , 2As shown, the present invention provides a marine salt spray resistant composite material air pipe closing device, comprising:

[0053] The outer tube body 1 has a closed top and an open bottom and is fixed to the upper end of the connecting flange 10 by a positioning pin 11, and air inlets 17 are symmetrically arranged at both non-adjacent ends around it;

[0054] The inner tube body 2 is arranged inside the outer tube body 1, and the bottom end of the inner tube body 2 is closed, and the top end has an air guide port 13, and the two ends of the non-adjacent openings around it are respectively connected to the air inlets 17 at the two ends of the outer tube body 1;

[0055] A connecting flange 10, the lower end of which is fixedly connected to the air pipe 12;

[0056] A floating ball sealing assembly, which can float up and down and is arranged in the inner tube body 2, is used to close or open the air guide port under air pressure, enter the cavity of the inner tube body 2 from the air inlet 17, and then pass through the air guide port 13 at the top of the inner tube body 2 to the cavity between the inner wall of the outer tube body 1 and the outer wall of the inner tube body 2, and finally pass through the connecting flange 10 connected to the bottom end of the outer tube body 1 to the air pipe 12, forming an air flow channel 16;

[0057] The sealing member 14 is disposed between the top inner wall of the outer tube body 1 and the top outer wall of the inner tube body 2, and is used to fit and seal with the float seal assembly when the float seal assembly floats.

[0058] in;

[0059] The outer tube body 1 and the inner tube body 2 are made of resin-based glass fiber + carbon fiber composite material.

[0060] The connecting flange 10 is made of 316L stainless steel.

[0061] The float seal assembly is made of PE material, and has the advantages of small surface friction coefficient, rust resistance, resistance to marine acid and alkali environment, and ability to prevent impact deformation. The spherical floating seal body and the seal are easier to form a good fit, and the sealing effect can be better guaranteed.

[0062] In one embodiment of the marine salt spray resistant composite air pipe closing device provided by the present invention, the air inlet 17 is symmetrically arranged on both sides of the outer tube body 1, and each includes an inner tube body support plate 3, a filter screen bottom plate 5, a filter screen pressure plate 6 and a filter screen cover plate 7 of the same size in sequence.

[0063] The inner tube support plate 3 has a support opening at the center thereof for accommodating the open end of the inner tube 2 .

[0064] The filter screen bottom plate 5 is provided with a filter screen 4 at the center.

[0065] The filter screen pressing plate 6 is provided with a through hole at the center thereof, the through hole matching the size of the filter screen 4 .

[0066] The filter screen cover plate 7 is a convex plate with the middle protruding outward.

[0067] The filter cover plate 7, the filter pressure plate 6, the filter bottom plate 5 and the inner tube support plate 3 are fixedly connected to the outer tube body 1 by means of a fixing member 8. After fixation, the middle part of the filter cover plate 7 protrudes outward to form an air inlet cavity between the filter pressure plate 6, and the air inlet cavity is communicated with the inner cavity of the inner tube body 2 through the through hole of the filter pressure plate 6 and the filter 4 of the filter bottom plate 5.

[0068] The filter screen 4 can effectively prevent solid impurities and particles in the water flow from entering the cavity, and prevent them from adhering to the sealing ring or floating sealing assembly, thereby avoiding seal failure due to impurity accumulation. Specifically, the filter screen intercepts the iron filings and impurities entering the pipeline from the air inlets 17 on both sides before entering the inner cavity, ensuring that the gas entering the cavity of the inner tube body 2 always remains clean air, so that when the float seal assembly in the inner tube body 2 floats up and down, the curved surface of the float can fit tightly with the lip of the sealing ring, and no gap will be generated to cause liquid infiltration, ensuring that the sealing effect is not affected by impurities. In addition, the air inlets 17 symmetrically arranged on both sides of the tube body 1 are perpendicular to the floating direction of the floating seal assembly, and are symmetrically arranged, so that the air flow force is not superimposed on the fitting force between the spherical floating seal body and the seal, and does not affect the life of the floating seal body.

[0069] like Figure 3 As shown, in one embodiment of the marine salt spray resistant composite air pipe closing device provided by the present invention, the bottom end of the seal 14 is fitted with the inner edge of the air guide port 13 and has a lip. The sealing lip can maintain a larger contact area with the float sealing assembly, and the sealing effect is better.

[0070] The present invention also provides a method for manufacturing a marine salt spray resistant composite material air pipe closing device, which comprises the following steps:

[0071] The inner tube and outer tube molds are prepared in advance, and a more advanced multi-layer composite material structure design is adopted to achieve quasi-isotropic mechanical properties. Specifically, a multi-layer combination of different materials is used to form a quasi-isotropic layer and optimize its mechanical properties and durability. The improved composite material structure design is as follows:

[0072] 1. Inner layer: Aramid fiber layer (total thickness 3.2mm, 8 layers)

[0073] Laying method:

[0074] First layer (0.4mm): 0° / 90° plain weave aramid fiber cloth

[0075] Second layer (0.4mm): ±45° twill woven aramid fiber cloth

[0076] Layer 3 (0.4mm): 0° / 90° plain weave aramid fiber cloth

[0077] 4th layer (0.4mm): ±45° twill woven aramid fiber cloth 5th layer (0.4mm): 0° / 90° plain woven aramid fiber cloth 6th layer (0.4mm): ±45° twill woven aramid fiber cloth 7th layer (0.4mm): 0° / 90° plain woven aramid fiber cloth 8th layer (0.4mm): ±45° twill woven aramid fiber cloth 2. Middle layer: unidirectional tape material layer (total thickness 4mm, 20 layers) Laying method:

[0078] 9th layer (0.2mm): 0° unidirectional carbon fiber fabric 10th layer (0.2mm): 90° unidirectional carbon fiber fabric 11th layer (0.2mm): +45° unidirectional carbon fiber fabric 12th layer (0.2mm): -45° unidirectional carbon fiber fabric 13th layer (0.2mm): 0° unidirectional basalt fiber fabric 14th layer (0.2mm): 90° unidirectional basalt fiber fabric 15th layer (0.2mm): +45° unidirectional basalt fiber fabric 16th layer (0.2mm): -45° unidirectional basalt fiber fabric 17th layer (0.2mm): 0° unidirectional carbon fiber fabric 18th layer (0.2mm): 90° unidirectional carbon fiber fabric 9th layer (0.2mm): +45° unidirectional carbon fiber fabric 20th layer (0.2mm): -45° unidirectional carbon fiber fabric 21st layer (0.2mm): 0° unidirectional basalt fiber fabric 22nd layer (0.2mm): 90° unidirectional basalt fiber fabric 23rd layer (0.2mm): +45° unidirectional basalt fiber fabric 24th layer (0.2mm): -45° unidirectional basalt fiber fabric 25th layer (0.2mm): 0° unidirectional carbon fiber fabric 26th layer (0.2mm): 90° unidirectional carbon fiber fabric 27th layer (0.2mm): +45° unidirectional carbon fiber fabric 28th layer (0.2mm): -45° unidirectional carbon fiber fabric

[0079] Outer layer: 3D woven carbon fiber layer (total thickness 2.8mm)

[0080] 29th layer: three-dimensional woven carbon fiber layer

[0081] On this basis, a polytetrafluoroethylene (PTFE) reinforcement layer is added, which not only improves the corrosion resistance and wear resistance, but also has excellent self-lubricating properties, which can significantly reduce wear and damage in harsh marine environments.

[0082] In order to further optimize the quasi-isotropic performance of the material, the present invention designs a multi-angle ply sequence to improve the mechanical performance of the composite material in multiple directions:

[0083] Lamination sequence design: aramid fiber layer → unidirectional prepreg layer → three-dimensional woven carbon fiber layer → PTFE reinforced coating.

[0084] Laying optimization: This multi-angle laying method not only enhances the isotropic properties of the material, but also enables it to maintain stability under multi-directional stress, avoiding the degradation of mechanical properties of the traditional single-angle laying structure. This design exhibits stronger compression, shear and impact resistance when dealing with high-load, multi-axial stress environments, greatly improving the durability and reliability of the device under extreme conditions.

[0085] A flame retardant resin system with brominated vinyl resin as the main agent and methyl ethyl ketone peroxide as the curing agent was injected into the mold by vacuum infusion process at a pressure of 0.09 MPa for 2 hours.

[0086] Then, the inner tube body and the outer tube body blank are made by curing at room temperature for 24 hours and curing at 60°C for 5 hours.

[0087] The inner tube body and the outer tube body are sandblasted to increase the roughness, and the end faces of the connecting flanges are polished to ensure that they are flat and smooth. Then, the connecting surfaces are cleaned to remove pollutants such as grease;

[0088] A layer of epoxy structural adhesive with a thickness of 0.15-0.2 mm is applied to the connection surface. A cylindrical pin 15 is also provided between the connection flange and the outer tube body. After the inner tube body, the outer tube body and the connection flange are assembled, they are placed in an oven at 60° C. and heated for 4 hours to complete curing to form a tube head assembly.

[0089] The float seal assembly, seal and air inlet are installed to the pipe head assembly to form a marine salt spray resistant composite air pipe closure device.

[0090] In one embodiment of the method for making the marine salt spray resistant composite air pipe closing device provided by the present invention, the flame retardant resin system in which the main agent is brominated vinyl resin and the curing agent is methyl ethyl ketone peroxide includes: using diphenylmethane diisocyanate (MDI), polypropylene glycol (PPG), hydroxyethyl methacrylate and copper-iron alloy as raw materials to synthesize polyurethane acrylate (PUA), which is then blended with copper-iron alloy and vinyl ester resin, and a modified vinyl ester resin containing polyurethane acrylate blocks is obtained by free radical copolymerization under the action of an initiator.

[0091] The specific formula and process parameters are as follows:

[0092] 1. Synthetic polyurethane acrylate:

[0093] Diphenylmethane diisocyanate: 0.1ml,

[0094] Polypropylene glycol (molecular weight about 2000): 0.05ml,

[0095] Hydroxyethyl methacrylate: 0.05ml,

[0096] Reaction temperature: 75°C,

[0097] Reaction time: 2 hours;

[0098] 2. Blending and copolymerization:

[0099] Polyurethane acrylate: the above synthesis amount,

[0100] Copper iron alloy powder: 5% w / w (relative to the weight of polyurethane acrylate),

[0101] Vinyl ester resin: 95% w / w (relative to the weight of polyurethane acrylate),

[0102] Initiator: 1% w / w (relative to the weight of vinyl ester resin),

[0103] Reaction temperature: 90°C,

[0104] Reaction time: 3 hours;

[0105] 3. Post-processing:

[0106] Cooling rate: Natural cooling at room temperature,

[0107] Curing time: 24 hours.

[0108] The present invention improves the ability of the material system to resist marine environmental corrosion and strengthens the toughness of the material through the modification of the resin, thereby meeting the mechanical environmental requirements of water pressure and wave impact. The product has a simple structure, and uses mature methods such as drawing and wrapping, molding, and vacuum infusion in composite material molding methods to prepare parts, and completes the overall assembly through gluing + screwing. Each component is detachable and repairable, which can meet the requirements of waterproofing and drainage, and can also meet the long-term use of anti-corrosion and salt spray resistance.

[0109] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A marine salt spray resistant composite air pipe closing device, characterized in that: include: The outer tube body has a closed top and an open bottom, and is fixed to the upper end of the connecting flange by a positioning pin, and air inlets are symmetrically arranged at both non-adjacent ends around it; The inner tube body is arranged inside the outer tube body, and the bottom end of the inner tube body is closed, the top end has an air guide port, and the two ends of the non-adjacent openings around it are respectively connected to the air inlets at the two ends of the outer tube body; A connecting flange, the lower end of which is fixedly connected to the air pipe; The floating ball sealing assembly is arranged in the inner tube body so as to float up and down, and is used to close or open the air guide port under air pressure, enter the inner tube body cavity from the air inlet, and then pass through the air guide port at the top of the inner tube body to the cavity between the inner wall of the outer tube body and the outer wall of the inner tube body, and finally pass through the connecting flange connected to the bottom end of the outer tube body to the air pipe to form an air flow channel; and a sealing member disposed between the top inner wall of the outer tube body and the top outer wall of the inner tube body, and used for sealing against the float seal assembly when the float seal assembly floats; in; The outer tube body and the inner tube body are made of a multi-layer composite material to achieve quasi-isotropic mechanics; The connecting flange is made of 316L stainless steel.

2. The marine salt spray resistant composite air pipe closing device according to claim 1 is characterized in that: The air inlets are symmetrically arranged on both sides of the outer tube body, and each of them includes an inner tube body support plate, a filter bottom plate, a filter pressing plate and a filter cover plate of the same size in sequence; The inner tube support plate has a support opening at the center thereof for accommodating the open end of the inner tube; The filter screen bottom plate has a filter screen arranged at the center thereof; The filter screen pressing plate has a through hole at the center thereof that matches the size of the filter screen; The filter screen cover is a convex plate with the middle bulging outwards; The filter cover plate, filter pressure plate, filter bottom plate and the inner tube support plate are fixedly connected to the outer tube body in sequence from outside to inside through fixing parts. The middle part of the filter cover plate protrudes outward to form an air inlet cavity between the filter pressure plate. The air inlet cavity is connected to the inner tube body cavity through the through hole of the filter pressure plate and the filter of the filter bottom plate.

3. The marine salt spray resistant composite air pipe closing device according to claim 2 is characterized in that: The bottom end of the sealing member is in contact with the inner edge of the air guide port and has a lip.

4. The marine salt spray resistant composite air pipe closing device according to claim 3 is characterized in that: The floating ball sealing component is a spherical floating sealing body made of PE material.

5. A method for manufacturing a marine salt spray resistant composite air pipe closing device, characterized in that: The manufacturing steps of the marine salt spray resistant composite air pipe closing device according to any one of claims 1 to 4 are as follows: Prepare the inner tube body and outer tube body molds in advance, and lay the aramid fiber layer → unidirectional prepreg layer → three-dimensional woven carbon fiber layer → PTFE reinforced coating in sequence from the inside to the outside to form a quasi-isotropic layer; A flame retardant resin system with brominated vinyl resin as the main agent and methyl ethyl ketone peroxide as the curing agent was injected into the mold by vacuum infusion process at a pressure of 0.09 MPa for 2 hours. Then, the inner tube body and the outer tube body blank are made by curing at room temperature for 24 hours and curing at 60°C for 5 hours. The inner tube body and the outer tube body blank are sandblasted, the end faces of the connecting flanges are polished, and then the connecting surfaces are cleaned; A layer of epoxy structural adhesive with a thickness of 0.15-0.2mm is applied to the connection surface. A cylindrical pin is also provided between the connection flange and the outer tube body. After the inner tube body, the outer tube body and the connection flange are assembled, they are placed in an oven at 60°C for 4 hours to complete curing to form a tube head assembly; The float seal assembly, seal and air inlet are installed to the pipe head assembly to form a marine salt spray resistant composite air pipe closure device.

6. The method for manufacturing a marine salt spray resistant composite material air pipe closing device according to claim 5, characterized in that: The main agent is a brominated vinyl resin, and the curing agent is a flame retardant resin system of methyl ethyl ketone peroxide. The flame retardant resin system of methyl ethyl ketone peroxide is prepared by using diphenylmethane diisocyanate, polypropylene glycol, hydroxyethyl methacrylate and copper-iron alloy as raw materials to synthesize polyurethane acrylate, which is then blended with the copper-iron alloy and vinyl ester resin, and a modified vinyl ester resin containing a polyurethane acrylate block is prepared through a free radical copolymerization reaction under the action of an initiator.

7. The method for manufacturing a marine salt spray resistant composite material air pipe closing device according to claim 6, characterized in that: The flame retardant resin system formula and process parameters are as follows: 1) Synthetic polyurethane acrylate: Diphenylmethane diisocyanate: 0.1ml, Polypropylene glycol (molecular weight about 2000): 0.05ml, Hydroxyethyl methacrylate: 0.05ml, Reaction temperature: 75°C, Reaction time: 2 hours; 2) Blending and copolymerization: Polyurethane acrylate: Step 1) Synthesis amount, Copper iron alloy powder: 5% w / w, relative to the weight of polyurethane acrylate, Vinyl ester resin: 95% w / w, relative to the weight of polyurethane acrylate, Initiator: 1% w / w, relative to the weight of vinyl ester resin, Reaction temperature: 90°C, Reaction time: 3 hours; 3) Post-processing: Cooling rate: Natural cooling at room temperature, Curing time: 24 hours.

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