A composite fire door and its manufacturing method

Abstract

The present invention discloses a composite fire door and a manufacturing method thereof, which relates to the field of fire doors. The composite fire door includes a door frame, a wooden board and a filled fireproof core material. The door frame is a U-shaped composite structure of calcium carbonate and carbon fiber. A plurality of connecting plates are integrally arranged on the inner side of the door frame. The connecting plates are arranged in a plurality along the width direction of the door frame. A fireproof board is also installed between the door frame and the wooden board. The fireproof board is arranged in layers and includes carbon fiber plates on both sides, a fireproof skeleton inside and a fireproof filler coated inside the carbon fiber plates. The fireproof filler is a porous modified molybdate nanomaterial. The fireproof core material is a double-layer structure, including a magnesium oxychloride board and a perlite board adhered to one side of the magnesium oxychloride board. The perlite board is arranged towards the carbon fiber layer side. Two wooden boards cover both sides of the door frame. One wooden board is adhered to one side of the door frame, and the other wooden board is adhered and fixed to the carbon fiber board on the other side. The fire door is light in overall mass, has good fireproof performance, and has a strong smoking effect.

Description

Technical Field

[0001] The present invention relates to the technical field of fire doors, and particularly to a composite fire door and a manufacturing method thereof. Background Art

[0002] A fire door refers to a door that can meet the requirements of fire resistance stability, integrity, and heat insulation within a certain period of time. It is a fire partition with a certain fire resistance installed in fire compartments, evacuation stairwells, vertical shafts, etc. It is specifically used to isolate the fire source in building construction and plays a huge role in fire protection work. Once a fire occurs, people can obtain an escape opportunity through the fire door. [[ID=⑨]] [[ID=⑩]]

[0003] Currently, the commonly used fire doors are mostly steel fire doors, steel-wood fire doors, or fire doors made of a composite of metal and inorganic materials. Their materials are all non-combustible substances and have a high ability to resist high-temperature deformation. However, the overall steel fire door is very heavy, making it very inconvenient to open and close. Moreover, due to the relatively good thermal conductivity of metal, the temperature of the back side of the metal fire door will rise rapidly during a fire, causing a great obstacle to the evacuation of personnel and fire fighting and rescue. A fire door mainly consists of parts such as a door frame, a door core, a man-made board, and hardware. From the perspective of fire prevention and heat insulation, the fire door core plays the most important and crucial role.

[0004] From the requirements of the new fire door standard GB12955-2008 for the fire door core material, the fire door core material needs to have the following performance: (1) During the process of being burned by a large fire, the fire door core material needs to maintain heat insulation and integrity, and there is basically no deformation on the back side of the fire door core. This is the most important performance that the core material must possess. (2) The core material should be light, otherwise the fire door will be too heavy, which will affect production, transportation, installation, and use. The more appropriate density of the core material is within 0.4 g / cm3. Therefore, the fire door core must have a porous structure. (3) The core material should have necessary strength and toughness. However, it is well known that the strength and toughness of porous materials decrease very rapidly with the decrease in density. (4) The core material should be non-toxic and harmless, and during the process of fire prevention, the smoke toxicity meets the requirements of ZA2 level. In addition, in order to meet the requirements of the market, it also needs to have characteristics such as high production efficiency and low cost.

[0005] The main fire door core materials currently on the market are porous air-entraining magnesium oxide / magnesium chloride boards (abbreviated as porous air-entraining magnesium oxychloride boards) and perlite boards, but they have defects such as disintegration during burning and corrosiveness caused by brine backflow. Perlite boards, on the other hand, have serious shrinkage and deformation during burning and poor fireproofing and heat insulation properties. Prior art CN101555121A discloses a new type of composite perlite board for fireproofing and heat insulation and a method for its production, which has excellent mechanical strength and good thermal insulation and sound insulation capabilities, but its heat insulation and fireproofing performance is difficult to meet the increasingly stringent market requirements. At present, the fireproofing and heat insulation limit of fireproof roller shutters prepared from common fire door core materials on the market is tested in accordance with the provisions of GB / T 7633 in the national standard GB14102-2005, and is calculated by the method of determining the loss of fireproofing and heat insulation by the average temperature rise. Generally, the fireproofing limit does not exceed 2 hours.

[0006] At the same time, in order to further improve the fireproof and heat-insulating performance of the fire door core, a large number of companies in the industry have conducted many beneficial explorations. For example, CN115304344A discloses a fireproof and heat-insulating filler for steel fire doors. This patent adds a water-retaining agent to the common heat-insulating and fireproof core material. Water molecules are retained in the filler by the polymer water-retaining agent. When one side of the door panel is exposed to fire, the hardened filler absorbs heat and releases water molecules at the same time. The evaporation of water molecules takes away a large amount of heat, thereby effectively delaying the heating rate of the entire door panel and effectively improving the fireproof and heat-insulating performance. However, since the water-retaining agent contains a large amount of water, if the amount is too much, it will first lead to too low strength of the core molding material. In addition, when exposed to fire, while a large amount of water evaporates, the water-retaining agent shrinks to form a large number of voids, resulting in a sharp drop in the strength of the fireproof core material, which is prone to collapse due to burning shrinkage and deformation.

[0007] During their research, the inventors discovered that molybdenum and its inorganic compounds, such as nickel molybdate, possess very high melting points and high-temperature resistance. In air, molybdenum can withstand temperatures exceeding 600°C, and under inert gas, its resistance can reach temperatures exceeding 2000°C. Furthermore, materials such as carbon fiber and carbon nanotubes have melting points as high as 3000°C, and are lightweight and high in strength. These materials can overcome the shortcomings of prior art composite doors, such as the tendency to deform or the heavy weight of calcium carbonate and carbon fiber composite doors. Therefore, the inventors, combining the basic processes and principles of composite materials, applied these materials to fire doors, creating a composite fire door. Summary of the Invention

[0008] The purpose of the present invention is to provide a composite fire door, which has a light overall weight, good fire protection performance, and a strong smoke-absorbing effect. At the same time, the manufacturing process provided by the present invention is simple to operate and convenient and easy to operate.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A composite fire door, comprising a door frame, a wooden board and a filled fireproof core material. The door frame is a composite structure of U-shaped calcium carbonate and carbon fiber. A number of connecting plates are integrally arranged on the inner side of the door frame. The connecting plates are arranged in a number of along the width direction of the door frame. A fireproof board is further installed between the door frame and the wooden board. The fireproof board is arranged in layers. The fireproof board includes carbon fiber boards on both sides, a fireproof frame inside and a fireproof filler coated inside the carbon fiber boards. The fireproof filler is a porous modified molybdate nanomaterial. The fireproof core material is a double-layer structure, including a magnesium oxychloride board and a perlite board adhered to one side of the magnesium oxychloride board. The perlite board is arranged towards the carbon fiber layer side. There are two wooden boards, and the two wooden boards cover both sides of the door frame. One wooden board is adhered to one side of the door frame, and the other wooden board is adhered and fixed to the carbon fiber board on the other side.

[0011] In the present invention, fireproof solid wood is used as the panel to improve its aesthetics. At the same time, a composite door frame of calcium carbonate and carbon fiber is adopted inside and combined with a fireproof board for fire prevention and smoke absorption. Specifically, the melting point temperatures of the carbon fiber boards and carbon fiber tubes therein are both above 3000°C, and the melting point temperatures of the provided perlite board and magnesium oxychloride board are both above 2000°C. Therefore, the fireproof effect is good, and the large number of pores inside combined with carbon nanotubes and porous modified molybdate nanomaterials can have a good smoke absorption effect.

[0012] At the same time, the door frame is made of a composite of calcium carbonate material and carbon fiber. The calcium carbonate adopts high-density calcium carbonate, with a bulk density of 0.6 g / ml and a melting point of about 1300°C. At the same time, combined with the reinforcement of carbon fiber, the overall structural strength is high, and the quality is lower than that of the existing steel door frames.

[0013] As a preferred solution of the present invention, the material of the fireproof frame is carbon nanotubes after bonding. The fireproof frame includes a number of carbon nanotube group rods. Correspondingly, the carbon nanotube group rods are in an "L" shape or a "U" shape, and screw mounting holes are provided on the side of the carbon nanotube group rods.

[0014] As a preferred solution of the present invention, the side of the connecting plate is provided with the same screw mounting holes. There is a gap after the connecting plate is installed with the steel rods on both sides. The connecting plate and the carbon nanotube group rods are connected by using double-headed threaded rods. The double-headed threaded rods pass through the screw mounting holes on one side of the carbon nanotube group rods on the connecting plate, the screw mounting holes on the connecting plate and the screw mounting holes on the carbon nanotube group rods on the other side in sequence and are locked by nuts.

[0015] As a preferred embodiment of the present invention, several grooves are provided on the side surface of the wooden board adhered to the door frame. At positions corresponding to the grooves, several convex ribs are welded on the side surface of the door frame. A clamping plate is inserted into the inner side of the wooden board adhered to the carbon fiber board. The clamping plate is located in the gap after the connection plate and the steel rods on both sides are installed. A slot is provided on the clamping plate, and a TPU elastic ring is embedded at the bottom of the slot.

[0016] As a preferred embodiment of the present invention, a mounting plate is welded between the inner walls of the door frame. A concealed door closer is installed on the mounting plate. A wooden strip is provided on the side of the concealed door closer. The upper surface of the wooden strip is flush with the upper surface of the door frame. The wooden strip is adhered to the mounting plate. A lock hole for installing a door lock is provided on the wooden board close to the carbon fiber board side.

[0017] As a preferred embodiment of the present invention, nitrogen is filled inside the porous modified molybdate nanomaterial. The nitrogen fills the pores inside the porous modified molybdate nanomaterial. The outside of the porous modified molybdate nanomaterial is sealed with an epoxy resin having a high molecular weight.

[0018] As a preferred embodiment of the present invention, the perlite board is adhered to the magnesium oxychloride board. Several concave holes are provided inside the perlite board. A magnesium oxychloride tube is connected between two adjacent concave holes. Several through holes are provided on the side surface of the magnesium oxychloride tube.

[0019] The present invention also provides a manufacturing method of a composite fire door. Based on the foregoing composite fire door, the specific manufacturing steps include the following:

[0020] (1). Manufacture the door frame. According to the required door length and width dimensions, manufacture a mold. Lay multiple layers of carbon fiber mesh boards inside the mold in the height direction. Pour molten calcium carbonate inside and take it out after cooling. At the same time, integrally form the connection plate, the mounting plate and the convex ribs to form a U-shaped door frame;

[0021] (2). Make perforations on the connection plate for screw installation. One end of the connection plate abuts against the end of the door frame, and the other end reserves the position of the mounting plate at the end of the door frame;

[0022] (3). Manufacture the carbon nanotube group rods and make perforations on the side surfaces of the carbon nanotube group rods. The carbon nanotube group rods are manufactured in an "L" shape or a "U" shape;

[0023] (4). Prepare the porous modified molybdate nanomaterial;

[0024] (5). On one side of the carbon nanotube group rods obtained in step (3), adhesively bond the woven carbon fiber board with an inorganic silica adhesive. After one side is adhesively bonded, fill the inside with the porous modified molybdate nanomaterial prepared in step (4). After filling and keeping it full, then adhesively bond the carbon fiber board on the other side to complete the production of the fire board;

[0025] (6) Install the produced fireproof boards one by one inside the door frame and lock them with double-headed threaded rods and nuts;

[0026] (7) Weld the mounting plates and weld the mounting plates on top of all the connecting plates for installing the concealed door closer;

[0027] (8) Produce the fireproof core material and fill it in the position between the fireproof board and the door frame;

[0028] (9) Bond the wooden boards, bond the wooden boards on the convex rib side of the corresponding door frame, and use inorganic silicone adhesive for bonding;

[0029] (10) Install the door lock and the conventional equipment that must be included in the fireproof door, and then bond the wooden board to the fireproof board with inorganic silicone adhesive to complete the production of the fireproof door.

[0030] As a preferred embodiment of the present invention, the specific steps of step ③ include:

[0031] ① Produce a tubular mold using PET resin;

[0032] ② Coat all surfaces of the mold with inorganic silicone adhesive;

[0033] ③ After applying evenly, put it into the single-walled carbon nanotube powder pile, and stir the powder pile. After stirring, take it out to obtain a carbon nanotube group rod containing PET resin;

[0034] ④ Calcinate the carbon nanotube group rod in step ③, keep the temperature at 220 °C to 260 °C, and the calcination time is 1 h to 3 h, and collect the carbon nanotube group rod;

[0035] ⑤ Soak it in ethylene glycol for 1 h to 3 h, and after soaking, rinse it repeatedly with deionized water 5 times, and dry it in an environment of 50 °C for 1 h to 3 h, and collect it;

[0036] ⑥ Grind the collected carbon nanotube group rod and roughen the surface to obtain the required carbon nanotube group rod.

[0037] As a preferred embodiment of the present invention, the specific steps of step ④ include:

[0038] ①. Using molybdenum disulfide and manganese acetate as raw materials, measure 40 ml of ethylene glycol solution and place it inside a beaker. Then, weigh 0.92 g of molybdenum disulfide and 0.49 g of manganese acetate respectively and add them to the beaker containing the aforementioned ethylene glycol solution. Stir the solution vigorously for 30 min under magnetic stirring to form a homogeneous mixture. Then, add 6.0 g of polyvinylpyrrolidone to the mixed solution, heat it to 60 °C, and continue stirring for 60 min. After the polyvinylpyrrolidone is completely dissolved, add 9.6 g of urea and continue stirring for 60 min. Subsequently, transfer the obtained solution to a reaction kettle and keep it in an electric heating blast drying oven at 220 °C for 48 h. Use a permanent magnet to collect the wet precipitate, and then rinse it three times with deionized water to remove impurities. Finally, dry the sample in a vacuum oven at 60 °C for 24 hours to obtain porous molybdate nanospheres;

[0039] ②. Scale up according to the ratio in step ① to prepare a large amount of porous molybdate nanospheres;

[0040] ③. Introduce nitrogen gas into the porous molybdate nanospheres;

[0041] ④. During the introduction of nitrogen gas, add epoxy resin with a mass ratio of 0.75 to the porous molybdate nanospheres and stir evenly to obtain porous modified molybdate nanospheres;

[0042] ⑤. Dry the porous modified molybdate nanospheres obtained in step ④ in a drying tower for 48 h at a temperature of 50 °C and collect them for standby.

[0043] As a preferred embodiment of the present invention, a rotating shaft is rotatably connected to the side of the acidic electrolyte mixing tank. The rotating shaft extends into the acidic electrolyte mixing tank. A fixing plate is fixed at the end of the rotating shaft located inside the acidic electrolyte mixing tank. A plurality of fixing plates are provided along the circumferential direction of the rotating shaft. Stirring blades are rotatably connected to the ends of the fixing plates away from the rotating shaft. A plurality of stirring blades are provided. The end of the rotating shaft extending out of the acidic electrolyte mixing tank is connected to a motor.

[0044] In summary, the beneficial technical effects of the present invention are as follows:

[0045] 1. Improve the overall structure of the fire door, which is made by combining steel plates, wooden boards and fireproof boards. Among them, the fireproof board uses carbon fiber and carbon nanotube materials, has strong supporting performance, is not easy to deform, and is internally filled with fireproof fillers, which improves the fireproof performance while increasing the strength and reducing the overall quality;

[0046] 2. The fireproof filler provided uses nickel molybdate nanomaterials with high heat resistance performance. At the same time, it has a porous structure after modification and seals inert gases such as nitrogen inside. The sealing is done with fusible epoxy resin. During a fire, nitrogen is easily released, which further improves the heat resistance performance of the nickel molybdate nanomaterials. At the same time, the porous performance can effectively increase the amount of smoke absorption;

[0047] 3. Improve the fireproof core material. Based on the existing materials, expand the holes inside the perlite board to further increase the smoking amount.

[0048] 4. The porous modified nickel molybdate nanomaterial can be recycled and reused multiple times, and both the wooden board and the fireproof board structures are detachable and recombinable, reducing the subsequent use cost.

[0049] 5. Use a high-density calcium carbonate and carbon fiber composite material to replace the existing steel door frame. While having excellent fireproof performance, the overall strength is improved, and the quality is further reduced.

[0050] 6. The manufacturing process includes the synthesis of the porous modified nickel molybdate nanomaterial and the production of the carbon nanotube group rod. The overall processing technology is simple to operate and convenient to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation to the present invention. In the drawings:

[0052] Figure 1 is a schematic structural diagram of a composite fireproof door and its manufacturing method in this embodiment;

[0053] Figure 2 is a Figure 1 exploded structural diagram of a composite fireproof door and its manufacturing method in this embodiment;

[0054] Figure 3 is a schematic connection diagram of the door frame and the fireproof board of a composite fireproof door and its manufacturing method in this embodiment;

[0055] Figure 4 is a schematic internal diagram of the fireproof board of a composite fireproof door and its manufacturing method in this embodiment;

[0056] Figure 5 is a schematic internal diagram of the fireproof core material of a composite fireproof door and its manufacturing method in this embodiment;

[0057] Figure 6 is a scanning electron microscope schematic diagram of the porous modified nickel molybdate nanomaterial in the protective filler of a composite fireproof door and its manufacturing method in this embodiment.

[0058] In the figure, 1. Door frame; 2. Wooden board; 3. Connecting plate; 4. Fireproof board; 5. Carbon fiber board; 6. Fireproof frame; 7. Fireproof filler; 8. Magnesium oxychloride board; 9. Perlite board; 10. Screw installation hole; 11. Double-headed threaded rod; 12. Nut; 13. Groove; 14. Convex rib; 15. Clamping plate; 16. Slot; 17. TPU elastic ring; 18. Installation plate; 19. Hidden door closer; 20. Wooden strip; 21. Concave hole; 22. Magnesium oxychloride tube; 23. Through hole. Detailed implementation manners

[0059] The present invention will be further described in detail below with reference to the accompanying drawings.

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] Please refer to Figures 1-6 , the present invention provides a technical solution: a composite fire door and a manufacturing method thereof, including a door skeleton 1, a wooden board 2 and a filled fireproof core material. The door skeleton 1 is a composite structure of U-shaped calcium carbonate and carbon fiber. A plurality of connecting plates 3 are integrally arranged inside the door skeleton 1. A plurality of connecting plates 3 are arranged along the width direction of the door skeleton 1. A fireproof board 4 is further installed between the door skeleton 1 and the wooden board 2. The fireproof board 4 is arranged in layers. The fireproof board 4 includes carbon fiber plates 5 on both sides, a fireproof skeleton 6 inside, and a fireproof filler 7 coated inside the carbon fiber plates 5. The fireproof filler 7 is a porous modified molybdate nanomaterial. The fireproof core material is a double-layer structure, including a magnesium oxychloride board 8 and a perlite board 9 bonded to one side of the magnesium oxychloride board 8. The perlite board 9 is arranged facing the carbon fiber layer side. There are two wooden boards 2. The two wooden boards 2 cover both sides of the door skeleton 1. One of the wooden boards 2 is bonded to one side of the door skeleton 1, and the other wooden board 2 is bonded and fixed to the carbon fiber plate 5 on the other side.

[0062] The material of the fireproof skeleton 6 is carbon nanotubes after bonding. The fireproof skeleton 6 includes a plurality of carbon nanotube group rods. Correspondingly, the carbon nanotube group rods are in an "L" shape or a "U" shape. Screw mounting holes 10 are provided on the side of the carbon nanotube group rods.

[0063] The same screw mounting holes 10 are provided on the side of the connecting plate 3. There is a gap after the connecting plate 3 is installed with the steel rods on both sides. The connecting plate 3 and the carbon nanotube group rods are connected by using a double-headed threaded rod 11. The double-headed threaded rod 11 sequentially passes through the screw mounting holes 10 on one side of the carbon nanotube group rod of the connecting plate 3, the screw mounting holes 10 on the connecting plate 3, and the screw mounting holes 10 on the carbon nanotube group rod on the other side and is locked by a nut 12.

[0064] In this embodiment, four groups of screw mounting holes 10 are provided on the side of the connecting plate 3 along the length direction of the connecting plate 3. Each group has two screw mounting holes 10. Along the width direction of the connecting plate 3, the door skeleton 1 is a U-shaped structure. Grooves for installing concealed hinges are cut out on both sides of it. At the same time, both sides are not covered by the wooden board 2. The wooden board 2 covers both sides of its upper and lower surfaces. Specifically, the wooden board 2 used is fireproof solid wood.

[0065] Inside the door frame 1, a mounting plate 18 for installing a concealed door closer 19 is welded. The top part, except for the area of the concealed door closer 19, is covered with a wooden board 2. Specifically, the mounting plate 18 is welded between the inner walls of the door frame 1. The concealed door closer 19 is installed on the mounting plate 18. A wooden strip 20 is provided on the side of the concealed door closer 19. The upper surface of the wooden strip 20 is flush with the upper surface of the door frame 1. The wooden strip 20 is bonded to the mounting plate 18. A lock hole for installing a door lock is provided on the wooden board 2 near the carbon fiber board 5 side.

[0066] In the installation of the door frame 1 and the template, several grooves 13 are provided on the side of the wooden board 2 bonded to the door frame 1. At the positions corresponding to the grooves 13, several convex ribs 14 are welded on the side of the door frame 1. Correspondingly, when installing the wooden board 2, a slot is made along the vertical direction of the wooden board 2, and the position of the slot coincides with the position of the convex rib 14. Thus, when using an inorganic silicone adhesive for bonding, the bonding area increases, effectively improving the installation stability of the wooden board 2. On the other side, a clamping plate 15 is inserted into the inner side of the wooden board 2 bonded to the carbon fiber board 5. The clamping plate 15 corresponds to the gap after the connection plate 3 and the steel rods on both sides are installed. A slot 16 is provided on the clamping plate 15, and a TPU elastic ring 17 is embedded at the bottom of the slot 16. Since the connection plate 3 is fixed inside the door frame 1 by welding, the position of the connection plate 3 is fixed. When installing the fireproof board 4, the width of each fireproof board 4 is fixed, and thus the width of the above-mentioned gap is determined. When processing this side of the wooden board 2, the clamping plate 15 is inserted and installed on the wooden board 2. Two clamping plates 15 are in a group, and each clamping plate 15 is clamped on both sides of the connection plate 3. When contacting the double-headed threaded rod 11, the double-headed threaded rod 11 enters along the slot 16 of the clamping plate 15. At the same time, the bottom uses the TPU elastic ring 17 to resist the double-headed threaded rod 11, increasing the friction between the slot 16 and the double-headed threaded rod 11 and avoiding the double-headed threaded rod 11 from wearing the wooden board 2.

[0067] The porous modified molybdate nanomaterial is filled with nitrogen, and the nitrogen fills the pores inside the porous modified molybdate nanomaterial. The outside of the porous modified molybdate nanomaterial is sealed with an epoxy resin with a high molecular weight.

[0068] On the basis of the fire prevention by combining the carbon fiber board 5, carbon fiber tube, perlite board 9 and magnesium oxychloride board 8, the interior of the fireproof board 4 is further filled with a porous modified molybdate nanomaterial, and then the exterior of the porous modified molybdate nanomaterial is sealed with epoxy resin. When the temperature rises upon encountering fire, due to the low melting point of the high molecular weight epoxy resin, which is around 75 °C, when the temperature increases, after it melts, it can release the nitrogen gas inside the porous modified molybdate nanomaterial, reducing the oxygen content in the surrounding air, containing the fire while improving the fireproof performance of this fireproof door. At the same time, after the porous modified molybdate nanomaterial releases nitrogen gas, it has many internal pore spaces and can absorb smoke, thereby reducing the amount of smoke discharged. At the same time, combined with the physical and chemical properties of molybdate, under inert gas, the high temperature resistance temperature further increases. Therefore, nitrogen gas can also place the porous modified molybdate nanomaterial within the range of inert gas, further improving the fireproof performance.

[0069] At the same time, the fireproof core material is a combination of the magnesium oxychloride board 8 and the perlite board 9. The perlite board 9 is bonded to the magnesium oxychloride board 8. A number of concave holes 21 are provided inside the perlite board 9. A magnesium oxychloride tube 22 is connected between two adjacent concave holes 21. A number of through holes 23 are provided on the side of the magnesium oxychloride tube 22. Therefore, the holes on the perlite board 9 increase. At the same time, the magnesium oxychloride tube 22 with multiple through holes 23 is also arranged between the concave holes 21. Further combined with the above-mentioned porous modified molybdate nanomaterial, the amount of smoke absorption can be further increased.

[0070] Based on the fireproof door structure provided in this embodiment, in this embodiment, the following specific manufacturing steps are adopted to manufacture the composite fireproof door, and its process includes:

[0071] (1). Manufacture the door frame 1. According to the required door length and width dimensions, manufacture a mold. Lay multiple layers of carbon fiber mesh boards inside the mold in the height direction, pour molten calcium carbonate inside, and take it out after cooling. At the same time, integrally form the connecting plate 3 and the convex rib 14 to form a U-shaped door frame 1;

[0072] (2). Punch holes in the connecting plate 3 for screw installation. One end of the connecting plate 3 abuts against the end of the door frame 1, and the other end reserves the position of the mounting plate 18 with the end of the door frame 1;

[0073] (3). Manufacture the carbon nanotube group rod and punch holes on the side of the carbon nanotube group rod. The carbon nanotube group rod is manufactured in an "L" shape or a "U" shape;

[0074] (4). Prepare the porous modified molybdate nanomaterial;

[0075] (5) On one side of the carbon nanotube group rod obtained in step ③, a woven carbon fiber board 5 is adhered with an inorganic silica adhesive. After one side is adhered, the porous modified molybdate nanomaterial prepared in step ④ is filled inside. After filling and keeping it full, the carbon fiber board 5 on the other side is adhered to complete the production of the fireproof board 4;

[0076] (6) The produced fireproof boards 4 are installed one by one inside the door frame 1 and locked by the double-headed threaded rods 11 and nuts 12;

[0077] (7) The mounting plate 18 is welded. The mounting plate 18 is welded on the top of all the connecting plates 3 for installing the concealed door closer 19;

[0078] (8) The fireproof core material is made and filled in the position between the fireproof board 4 and the door frame 1;

[0079] (9) The wood board 2 is adhered. The wood board 2 corresponding to the convex rib 14 side of the door frame 1 is adhered with an inorganic silica adhesive for bonding;

[0080] (10) The door lock and the conventional equipment necessary for the fireproof door are installed, and then the wood board 2 is adhered to the fireproof board 4 with an inorganic silica adhesive to complete the production of the fireproof door.

[0081] Among them, the specific steps of step ③ include:

[0082] ① A tubular mold is made of PET resin;

[0083] ② All surfaces of the mold are coated with an inorganic silica adhesive;

[0084] ③ After being evenly coated, it is placed in a single-walled nanotube powder pile, and the powder pile is stirred. After stirring, it is taken out to obtain a carbon nanotube group rod containing PET resin;

[0085] ④ The carbon nanotube group rod in step ③ is calcined, keeping the temperature at 220 °C and the calcination time at 3 h, and the carbon nanotube group rod is collected;

[0086] ⑤ It is soaked in ethylene glycol for 3 h. After soaking, it is repeatedly rinsed 5 times with deionized water and dried in an environment at 50 °C for 3 h, and then collected;

[0087] ⑥ The collected carbon nanotube group rod is polished until the inner wall thickness of the carbon nanotube group rod is 2 mm, and the surface is roughened to obtain the required carbon nanotube group rod.

[0088] Among them, the specific steps of step ④ include:

[0089] ①. Using molybdenum disulfide and manganese acetate as raw materials, measure 40 ml of ethylene glycol solution and place it inside a beaker. Then, weigh 0.92 g of molybdenum disulfide and 0.49 g of manganese acetate respectively and add them to the beaker containing the aforementioned ethylene glycol solution. Stir the solution vigorously for 30 min to form a homogeneous mixture. Then, add 6.0 g of polyvinylpyrrolidone to the mixed solution, heat it to 60 °C, and continue stirring for 60 min. After the polyvinylpyrrolidone is completely dissolved, add 9.6 g of urea and continue stirring for 60 min. Subsequently, transfer the obtained solution to a reaction kettle and keep it in an electrothermal blast drying oven at 220 °C for 48 h. Use a permanent magnet to collect the wet precipitate, and then rinse it three times with deionized water to remove impurities. Finally, dry the sample in a vacuum oven at 60 °C for 24 hours to obtain porous nickel molybdate nanospheres;

[0090] ②. Scale up according to the ratio in step ① to prepare a large amount of porous nickel molybdate nanospheres;

[0091] ③. Introduce nitrogen into the porous nickel molybdate nanospheres;

[0092] ④. During the introduction of nitrogen, add epoxy resin with a mass ratio of 0.75 to the porous nickel molybdate nanospheres and stir evenly to obtain porous modified nickel molybdate nanospheres;

[0093] ⑤. Dry the porous modified molybdate nanospheres obtained in step ④ in a drying tower for 48 h at a temperature of 50 °C and collect for standby.

[0094] By taking a scanning electron microscope image of the porous molybdate nanospheres prepared by the above preparation method, the scanning electron microscope image as shown in Figure 5 can be obtained. It can be observed that it is a secondary structure formed by the clustering of multiple particles, with a uniform particle size distribution. Due to the clustering of multiple particles, a large number of interstitial holes are formed inside each secondary sphere. Therefore, it can be used as a storage carrier for nitrogen, and at the same time, the melting point of nickel molybdate itself is about 1000 °C.

[0095] During actual testing, the thickness of the steel plate in this application is limited to 2 mm, the width is 1270 mm, and the length is 3072 mm. It is processed using the above process, and the fabricated composite fire door is subjected to the UL10C test of the American Standard and successfully passes the test, and the smoke emission is less visible compared to existing fire doors.

[0096] In this embodiment, the firewood board 2 adhesively fixed to the fireproof board 4 is installed facing the interior. If the board 2 is damaged, it can be replaced. At the same time, after the internal fireproof board 4 is worn out, the carbon fiber board 5 can be opened to refill the nitrogen-sealed porous modified nickel molybdate nanospheres for use. Therefore, the composite fire door provided by this embodiment can be used conveniently multiple times.

[0097] In particular, the door frame 1 inside this composite fire door is made of a composite of calcium carbonate and carbon fiber, which is suitable for various machining processes, and then various existing conventional concealed hardware such as concealed fire hinges can be installed, further improving the sound insulation performance.

[0098] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0099] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite fire door, comprising a door frame (1), a wooden board (2) and a filled fireproof core material, characterized in that, The door frame (1) is a composite structure of calcium carbonate and carbon fiber in a U-shaped shape. A number of connecting plates (3) are integrally provided on the inner side of the door frame (1). The connecting plates (3) are provided in several along the width direction of the door frame (1). A fireproof board (4) is further installed between the door frame (1) and the wooden board (2). The fireproof board (4) is arranged in layers. The fireproof board (4) includes carbon fiber boards (5) on both sides, a fireproof skeleton (6) inside, and a fireproof filler (7) wrapped inside the carbon fiber boards (5). The fireproof filler (7) is a porous modified molybdate nanomaterial. The fireproof core material is a double-layer structure, including a magnesium oxychloride board (8) and a perlite board (9) adhered to one side of the magnesium oxychloride board (8). The perlite board (9) is arranged facing the carbon fiber layer side. There are two wooden boards (2). The two wooden boards (2) cover both sides of the door frame (1). One of the wooden boards (2) is adhered to one side of the door frame (1), and the other wooden board (2) is adhesively fixed to the carbon fiber board (5) on the other side. The fireproof board (4) is in an "L" shape or a "U" shape. The material of the fireproof skeleton (6) is carbon nanotubes after adhesion. The fireproof skeleton (6) includes a number of carbon nanotube group rods. Correspondingly, the carbon nanotube group rods are in an "L" shape or a "U" shape. Screw mounting holes (10) are provided on the side of the carbon nanotube group rods. The same screw mounting holes (10) are provided on the side of the connecting plate (3). There is a gap after the connecting plate (3) is installed with the steel rods on both sides. The connecting plate (3) and the carbon nanotube group rods are connected by using a double-headed threaded rod (11). The double-headed threaded rod (11) sequentially passes through the screw mounting holes (10) on the carbon nanotube group rod on one side of the connecting plate (3), the screw mounting holes (10) on the connecting plate (3), and the screw mounting holes (10) on the carbon nanotube group rod on the other side and is locked by a nut (12). Nitrogen is filled inside the porous modified molybdate nanomaterial. The nitrogen fills the holes inside the porous modified molybdate nanomaterial. The outside of the porous modified molybdate nanomaterial is sealed with an epoxy resin with a high molecular weight. The perlite board (9) is adhered to the magnesium oxychloride board (8). A number of concave holes (21) are provided inside the perlite board (9). Magnesium oxychloride tubes ( 2. The composite fire door according to claim 1, wherein: ​ 3. The composite fire door according to claim 2, characterized in that: An installation plate (18) is welded between the inner walls of the door frame (1). A concealed door closer (19) is installed on the installation plate (18). A wooden strip (20) is provided on the side of the concealed door closer (19). The upper surface of the wooden strip (20) is flush with the upper surface of the door frame (1). The wooden strip (20) is adhesively bonded to the installation plate (18). A lock hole for installing a door lock is provided on the wooden board (2) near the carbon fiber board (5).

4. A manufacturing method of a composite fire door, based on the composite fire door described in claim 3, characterized in that: Specifically, it includes the following manufacturing steps: (1) Manufacture the door frame. According to the required door length and width dimensions, make a mold. Lay multiple layers of carbon fiber mesh boards inside the mold in the height direction. Pour molten calcium carbonate inside and take it out after cooling. At the same time, integrally form a connecting plate, an installation plate and a convex rib to form a U-shaped door frame; (2) Punch holes in the connecting plate for screw installation. One end of the connecting plate abuts against the end of the door frame, and the other end reserves the installation plate position at the end of the door frame; (3) Manufacture a carbon nanotube group rod and punch holes on the side of the carbon nanotube group rod. The carbon nanotube group rod is made into an "L" shape or a "U" shape; (4) Prepare a porous modified molybdate nanomaterial; (5) Adhere the woven carbon fiber board to one side of the carbon nanotube group rod obtained in step (3) using an inorganic silicone adhesive. After adhering one side, fill the inside with the porous modified molybdate nanomaterial prepared in step (4). After filling and keeping it full, then adhere the carbon fiber board on the other side to complete the production of the fireproof board; (6) Install the manufactured fireproof boards one by one inside the door frame and lock them with double-headed threaded rods and nuts; (7) Weld the installation plate and weld the installation plate on the top of all the connecting plates for installing a concealed door closer; (8) Manufacture a fireproof core material and fill it in the position between the fireproof board and the door frame; (9) Adhere the wooden board, adhere the wooden board corresponding to the convex rib side of the door frame, and use an inorganic silicone adhesive for bonding; (10) Install the door lock and the conventional equipment that the fireproof door must contain, and then adhere the wooden board to the fireproof board using an inorganic silicone adhesive to complete the production of the fireproof door.

5. The manufacturing method of a composite fire door according to claim 4, characterized in that: The specific steps of step (3) include: ① Use PET resin to make a tubular mold; ② Coat all surfaces of the mold with an inorganic silicone adhesive; ③ After smearing evenly, put it into a single-walled carbon nanotube powder pile and stir the powder pile. After stirring, take it out to obtain a carbon nanotube group rod containing PET resin; ④ Calcinate the carbon nanotube group rod in step (3), keep the temperature at 220°C to 260°C, and the calcination time is 1h to 3h, and collect the carbon nanotube group rod; ⑤ Soak it in ethylene glycol for 1h to 3h. After soaking, rinse it repeatedly with deionized water 5 times, and dry it in an environment of 50°C for 1h to 3h, and collect it; ⑥ Grind the collected carbon nanotube group rod and roughen the surface to obtain the required carbon nanotube group rod.

6. The manufacturing method of a composite fire door according to claim 4, characterized in that: The specific steps of step (4) include: ①. Using molybdenum disulfide and nickel acetate as raw materials, measure 40 ml of ethylene glycol solution and place it inside a beaker. Then, weigh 0.92 g of molybdenum disulfide and 0.51 g of nickel acetate respectively and add them to the beaker containing the aforementioned ethylene glycol solution. Stir the solution vigorously for 30 min to form a homogeneous mixture. Then, add 6.0 g of polyvinylpyrrolidone to the mixed solution, heat it to 60 °C, and continue stirring for 60 min. After the polyvinylpyrrolidone is completely dissolved, add 9.6 g of urea and continue stirring for 60 min. Subsequently, transfer the obtained solution to a reaction kettle and keep it in an electric heating blast drying oven at 220 °C for 48 h; use a permanent magnet to collect the wet precipitate, and then rinse it three times with deionized water to remove impurities; finally, dry the sample in a vacuum oven at 60 °C for 24 hours to obtain porous nickel molybdate nanospheres; ②. Scale up according to the ratio in step ① to prepare a large amount of porous nickel molybdate nanospheres; ③. Introduce nitrogen into the interior of the porous nickel molybdate nanospheres; ④. During the nitrogen introduction process, add epoxy resin with a mass ratio of 0.75 to the porous nickel molybdate nanospheres, and stir evenly to obtain porous modified nickel molybdate nanospheres; ⑤. Dry the porous modified nickel molybdate nanospheres obtained in step ④ in a drying tower for 48 h, maintain the temperature at 50 °C, and collect for standby.

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