Fireproof flame-retardant coating and preparation method thereof

Abstract

The invention relates to the technical field of fireproof flame-retardant coating production, in particular to a fireproof flame-retardant coating and a preparation method thereof.The fireproof flame-retardant coating is prepared from, by mass, 20-30 parts of aluminum hydroxide, 15-25 parts of ammonium polyphosphate, 10-20 parts of pentaerythritol, 8-16 parts of melamine and 5-10 parts of titanium dioxide. The fireproof flame-retardant coating is prepared through the preparation device of the fireproof flame-retardant coating, stirring blades can be driven to rotate and revolve through multiple stirring structures, double stirring of raw materials is achieved, the raw materials are stirred and mixed more sufficiently and uniformly, and all the components can fully play a role; the quality stability of the fireproof flame-retardant coating and the consistency of the fireproof performance are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of fire-retardant coating production, and in particular to a fire-retardant coating and a preparation method thereof. Background Art

[0002] Aluminum hydroxide is a common inorganic flame retardant. It will decompose during the heating process, absorb a lot of heat, effectively reduce the surface temperature of the material, and the water vapor produced by the decomposition can dilute the concentration of combustible gases in the surrounding air, thereby playing a flame retardant role. Ammonium polyphosphate is a highly efficient phosphorus-based flame retardant, rich in phosphorus and nitrogen elements, and releases substances such as phosphoric acid under high temperature conditions. These substances can form a dense carbonized layer on the surface of the material. The carbonized layer can not only isolate oxygen and prevent the further combustion reaction, but also block the heat from transferring to the inside, providing a good barrier for protecting the base material. In recent years, with the continuous improvement of building safety regulations and the significant improvement of people's awareness of fire safety, the demand for fire-retardant coatings has increased sharply. More and more construction projects, industrial facilities and other fields are in urgent need of efficient and reliable fire-retardant coatings to protect life and property safety. Aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine and titanium dioxide are widely used in the research and development and production of fire-retardant coatings due to their excellent fire retardant properties and the improvement of the comprehensive performance of coatings.

[0003] A Chinese patent with patent announcement number CN217910015U discloses a pulping tank, including a tank body, a stirring shaft, a stirring motor, and a discharge pipe. The stirring shaft is provided with long and short alternating stirring blades in the vertical direction. A support pipe is fixed to one side of the top of the tank body, and a connecting flange 1 is fixed to the top of the support pipe. A feed pipe is provided in the support pipe, and a plurality of powder discharge pipes are provided on the inner side wall of the lower part of the feed pipe. A fixed sleeve is provided on the upper part of the feed pipe, and a locking bolt is provided on the fixed sleeve. A connecting flange 2 is fixed to the fixed sleeve. A powder conveying pipe is connected to the top of the feed pipe, and a powder conveying pump is fixedly connected to the other end of the powder conveying pipe, and a powder extraction pipe is connected to the inlet of the powder conveying pump.

[0004] The above technical solution can achieve more uniform stirring and better prevent coagulation by alternately installing long and short stirring blades along the axial direction of the stirring shaft. In addition, the powder is fed by negative pressure suction, and then sent to the lower part of the liquid through the feed pipe and the powder discharge pipe for multi-layer distribution, which can facilitate subsequent stirring, mixing and slurrying. However, in essence, the material is only stirred by two stirring blades of different lengths. Therefore, the stirring capacity is limited, and when faced with materials with high viscosity, it cannot be effectively stirred. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a fire-retardant coating and a preparation method thereof. Through the multiple stirring structures, the stirring blades can be driven to both rotate and revolve, thereby realizing double stirring of the raw materials, making the stirring and mixing of the raw materials more sufficient and uniform, which is conducive to the full play of the effects of each component and ensuring the quality stability of the fire-retardant coating and the consistency of the fire retardant performance.

[0006] Technical solution: A fire-retardant coating, composed of the following components in parts by mass: 20-30 parts of aluminum hydroxide, 15-25 parts of ammonium polyphosphate, 10-20 parts of pentaerythritol, 8-16 parts of melamine and 5-10 parts of titanium dioxide.

[0007] Further description: 25 parts of aluminum hydroxide, 20 parts of ammonium polyphosphate, 15 parts of pentaerythritol, 12 parts of melamine and 8 parts of titanium dioxide.

[0008] A method for preparing a fire-retardant coating, wherein the fire-retardant coating is prepared by a fire-retardant coating preparation device, and the fire-retardant coating preparation device comprises a pulping tank, a top cover, a threaded pipe, a feed pipe, a discharge pipe, an interlayer and a multiple stirring structure, wherein the top cover is installed on the top of the pulping tank, the interlayer is opened inside the wall of the pulping tank, the threaded pipe is fixedly installed inside the interlayer, and both ends of the threaded pipe pass through the outer surface of the pulping tank, the feed pipe is fixedly installed on the outer surface of the pulping tank, and one end of the feed pipe passes through the inside of the pulping tank, the discharge pipe is fixedly installed on the bottom of the pulping tank, and the top of the discharge pipe passes through the inside of the pulping tank, and the multiple stirring structures are arranged inside the pulping tank.

[0009] It is further explained that the preparation method of the fire-retardant coating specifically includes the following steps: ① weigh aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine and titanium dioxide as raw materials according to the formula amount, and add the raw materials to the pulping tank in sequence; ② start the multiple stirring structure to fully stir and mix the raw materials, and mix 20 kg of raw materials with 80 kg of 40°C deionized water in the pulping tank, and then adjust the pH value to 4 with 10% phosphoric acid, add 0.5-1.2 kg of composite flame retardant synergist to dissolve, and the reaction time is 4 hours; ③ adjust the pH value to 7 with sodium hydroxide solution, add the composite dispersant to make its mass percentage concentration in the solution 0.5%, and place the two ends of the threaded pipe in the pulping tank. The end is connected to the external hot water circulation device, so that the pulping tank stirs and disperses the raw materials for 6 hours at a temperature of 40°C; the composite dispersant is composed of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate, and the weight ratio of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate is 4:3:2; ④ open the discharge pipe, discharge the substance obtained by the reaction into the pulping tank 1, and then mature and filter it, collect the filtrate, use the inlet air temperature of 180°C, the outlet air temperature of 100°C, and the homogenization pressure of 30MPa for spray drying, collect the dried powder, add an appropriate amount of solvent and thickener to prepare a fire retardant coating to obtain a fire retardant coating product.

[0010] Further description, the multiple stirring structure includes stirring blades, a sleeve, a rotating shaft, bevel gear 1, bevel gear 2, connecting gears and connecting tooth grooves for stirring raw materials. A rotating shaft is rotatably connected between the bottom of the top cover and the interior of the pulping tank, and a sleeve is rotatably connected between the bottom of the top cover and the interior of the pulping tank and located on the outer surface of the rotating shaft. The outer surface of the rotating shaft is located inside the sleeve and three bevel gears 1 are equidistantly fixedly connected, and three pairs of bevel gears 2 are equidistantly rotatably connected inside the sleeve. Each bevel gear 2 passes through the outer surface of the sleeve and is fixedly connected to a stirring blade. Connecting tooth grooves are opened at the top and bottom of the sleeve, and the outer surface of the rotating shaft is located inside the two connecting tooth grooves and is fixedly connected to connecting gears.

[0011] To further illustrate, the three pairs of bevel gears 2 are respectively meshed and connected with the three bevel gears 1, and the connecting gears are meshed with the connecting tooth grooves.

[0012] Further explanation, the preparation device of the fire-retardant coating also includes a discharging structure arranged at the bottom of the top cover and convenient for discharging, the discharging structure includes a pressure plate, the pressure plate is located at the bottom of the top cover, the top of the top cover is symmetrically rotatably connected to two power gears, the interiors of the two power gears are threadedly connected to screws through the tops, the outer surface of the screw is provided with two interlaced thread grooves, the bottom thread of the screw penetrates the bottom of the top cover, and the bottom of the screw is rotatably connected to the top of the pressure plate, the top of the pressure plate is provided with a through groove through the bottom, and the shape of the through groove is consistent with the overall top-view shape of the sleeve and a pair of stirring blades.

[0013] It is further explained that the preparation device of the fire-retardant coating also includes a toothed belt, a transmission gear and a connecting block for transmitting two power gears. A toothed belt is provided in a meshing sleeve between the two power gears. The top of the top cover is rotatably connected to the toothed belt and the transmission gear is meshed with the toothed belt. The top of the rotating shaft passes through the bottom of the top cover and is fixedly connected to the connecting block inside.

[0014] Further explanation, the preparation device of the fire-retardant coating also includes a switching structure, and the switching structure is arranged inside the transmission gear and the connecting block, and the two switching structures are in an upside-down relationship, and the switching structure includes a rotating block and a transmission tooth groove, the transmission tooth groove is opened inside the transmission gear and passes through the top and the bottom, the rotating block is located inside the transmission tooth groove, and a plurality of placement grooves are opened inside the rotating block through the outer surface, and the inside of the placement groove passes through the outer surface of the rotating block and is rotatably connected with a transmission block, a group of springs are fixedly connected between the side of the transmission block and the inside of the placement groove, the transmission tooth groove is composed of a plurality of inclined surfaces and vertical surfaces, and the transmission block and the transmission tooth groove are adaptively matched.

[0015] Further description, the device for preparing the fire-retardant coating also includes a motor, a coupling and a mounting frame for driving the rotating block to rotate. The top of the top cover is located on the top of the transmission gear and is fixedly connected to the mounting frame. The top of the mounting frame is fixedly connected to the motor. The coupling is fixedly connected between the two rotating blocks. The output shaft of the motor passes through the bottom of the mounting frame, and the output shaft of the motor is fixedly connected to the top of the coupling.

[0016] The above embodiments of the present invention can achieve the following beneficial effects: 1. A multiple stirring structure consisting of stirring blades, sleeves, rotating shafts, bevel gear 1, bevel gear 2, connecting gears and connecting tooth grooves is adopted. The rotation of the rotating shaft can drive the stirring blades to both rotate and revolve, realizing double stirring of the raw materials, making the raw materials more fully and evenly stirred, which is conducive to the full play of the functions of each component and ensuring the quality stability of the fire retardant coating and the consistency of the fire retardant performance; 2. It is equipped with a discharging structure composed of a pressing plate, a power gear, a screw, etc. In case of high viscosity of the reactants, the downward pressure of the pressing plate can not only quickly squeeze and discharge the prepared reactants, thereby improving the discharging efficiency, but also scrape off the reactants adhering to the inner wall of the pulping tank, the surface of the stirring blades and the surface of the sleeve, thereby avoiding reactant residues and ensuring that the fire-retardant coating can be completely collected, thereby ensuring the output and facilitating the subsequent use performance; 3. Configure the switching structure to realize the switching control of the working state of the discharging structure and the multiple stirring structures by rotating the motor output shaft in different directions, which can ensure that the stirring and discharging operations are carried out separately at the appropriate stages to avoid mutual interference, making the entire preparation process more orderly and efficient, and further ensuring the smooth progress of the fire retardant coating production process and the quality of the final product. In this process, only one power input end is required to control the operation of the multiple stirring structure and the discharging structure, so that its energy loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is the top cover and pulping tank analysis diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the multiple stirring structure after the sleeve analysis of the present invention.

[0020] Figure 4 This is a disassembled view of the rotating shaft and sleeve structure of the present invention.

[0021] Figure 5 It is a diagram showing the discharging structure after the top cover of the present invention is dissected.

[0022] Figure 6 For the present invention Figure 5 Enlarged view of part A.

[0023] Figure 7 It is a top view of the pressing plate and stirring blade of the present invention after being disassembled.

[0024] Figure 8 This is a diagram showing the transmission gear structure after the mounting frame of the present invention is disassembled.

[0025] Fig. 9 For the present invention Figure 8 Enlarged view of part B.

[0026] Fig.10 This is a diagram showing the connecting block and transmission gear structure of the present invention.

[0027] Fig.11 It is a top view comparison diagram of two switching structures of the present invention.

[0028] Fig.12 It is an exploded diagram of the switching structure of the present invention.

[0029] Fig.13 For the present invention Fig.12 Enlarged view of part C.

[0030] In the above drawings: 1. pulping tank; 2. top cover; 3. threaded pipe; 4. feed pipe; 5. discharge pipe; 6. discharge structure; 7. interlayer; 8. sleeve; 9. rotating shaft; 10. stirring blade; 11. bevel gear one; 12. bevel gear two; 13. connecting gear; 14. connecting tooth groove; 15. multiple stirring structure; 16. pressing plate; 17. through groove; 18. screw; 19. power gear; 20. tooth belt; 21. mounting frame; 22. motor; 23. transmission gear; 24. switching structure; 25. rotating block; 26. transmission tooth groove; 27. connecting shaft; 28. connecting block; 29. ​​placement groove; 30. transmission block; 31. spring. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0032] Example 1: A fire-retardant coating, comprising the following components in parts by mass: 20-30 parts of aluminum hydroxide, 15-25 parts of ammonium polyphosphate, 10-20 parts of pentaerythritol, 8-16 parts of melamine and 5-10 parts of titanium dioxide.

[0033] The components include 25 parts of aluminum hydroxide, 20 parts of ammonium polyphosphate, 15 parts of pentaerythritol, 12 parts of melamine and 8 parts of titanium dioxide.

[0034] Embodiment 2: Based on embodiment 1, Figure 1 and 2 As shown, the fire-retardant coating is prepared by a fire-retardant coating preparation device, and the fire-retardant coating preparation device includes a pulping tank 1, a top cover 2, a threaded pipe 3, a feed pipe 4, a discharge pipe 5, an interlayer 7 and a multiple stirring structure 15, the top cover 2 is installed on the top of the pulping tank 1, the interlayer 7 is opened inside the wall of the pulping tank 1, the threaded pipe 3 is fixedly installed inside the interlayer 7, and both ends of the threaded pipe 3 pass through the outer surface of the pulping tank 1, the feed pipe 4 is fixedly installed on the outer surface of the pulping tank 1, and one end of the feed pipe 4 passes through the inside of the pulping tank 1, the discharge pipe 5 is fixedly installed on the bottom of the pulping tank 1, and the top of the discharge pipe 5 passes through the inside of the pulping tank 1, and the multiple stirring structures 15 are arranged inside the pulping tank 1.

[0035] The preparation method specifically comprises the following steps: ① weigh aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine and titanium dioxide as raw materials according to the formula amount, and add the raw materials to the pulping tank 1 in sequence; ② start the multiple stirring structure 15, fully stir and mix the raw materials, mix 20 kg of raw materials with 80 kg of 40°C deionized water in the pulping tank 1, then adjust the pH value to 4 with 10% phosphoric acid, add 0.5-1.2 kg of composite flame retardant synergist to dissolve, and react for 4 hours; ③ adjust the pH value to 7 with sodium hydroxide solution, add composite dispersant, so that its mass percentage concentration in the solution is 0.5%, connect the two ends of the threaded tube 3 with the outer A hot water circulation device is provided in the pulping tank 1 to stir and disperse the raw materials at a temperature of 40°C for 6 hours; the composite dispersant is composed of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate, and the weight ratio of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate is 4:3:2; ④ open the discharge pipe 5, discharge the substance obtained by the reaction into the pulping tank 1, and then mature and filter it, collect the filtrate, adopt an inlet air temperature of 180°C, an outlet air temperature of 100°C, and a homogenizing pressure of 30MPa for spray drying, collect the dried powder, add an appropriate amount of solvent and thickener to prepare a fire retardant coating to obtain a fire retardant coating product.

[0036] Embodiment 3, on the basis of embodiment 2, as Figure 2-Figure 4 As shown, the multiple stirring structure 15 includes a stirring blade 10 for stirring raw materials, a sleeve 8, a rotating shaft 9, a bevel gear 11, a bevel gear 2 12, a connecting gear 13 and a connecting tooth groove 14, the rotating shaft 9 is rotatably connected between the bottom of the top cover 2 and the inside of the pulping tank 1, the sleeve 8 is rotatably connected between the bottom of the top cover 2 and the inside of the pulping tank 1 and located on the outer surface of the rotating shaft 9, the outer surface of the rotating shaft 9 is located inside the sleeve 8 and is equidistantly fixedly connected with three bevel gears 11, the inside of the sleeve 8 is equidistantly rotatably connected with three pairs of bevel gears 2 12, each bevel gear 2 12 passes through the outer surface of the sleeve 8 and is fixedly connected with a stirring blade 10, the top and bottom of the sleeve 8 are provided with connecting tooth grooves 14, and the outer surface of the rotating shaft 9 is located inside the two connecting tooth grooves 14 and is fixedly connected with connecting gears 13; Rotating the rotating shaft 9 drives the three bevel gears 11 to rotate, and then drives all the stirring blades 10 to rotate through three pairs of bevel gears 2 12. While the rotating shaft 9 rotates, it drives the two connecting gears 13 to rotate together, and then drives the sleeve 8 to rotate through two connecting tooth grooves 14. The rotation of the sleeve 8 will drive all the stirring blades 10 to revolve along the center of the sleeve 8. Therefore, the rotation of the rotating shaft 9 will drive all the stirring blades 10 to rotate and revolve along the center of the sleeve 8, thereby increasing the ways in which the stirring blades 10 stir the raw materials, and performing double stirring on the raw materials.

[0037] like Figure 4As shown, the three pairs of bevel gears 2 12 are meshed and connected with the three bevel gears 1 11 respectively, and the connecting gear 13 is meshed with the connecting tooth groove 14 .

[0038] Embodiment 4: Based on embodiment 2, Figure 5 The preparation device of the fire-retardant coating shown also includes a discharging structure 6 which is arranged at the bottom of the top cover 2 and is convenient for discharging. The discharging structure 6 includes a pressing plate 16, and the pressing plate 16 is located at the bottom of the top cover 2. The top of the top cover 2 is symmetrically rotatably connected to two power gears 19. The insides of the two power gears 19 penetrate the tops and are both threadedly connected with screws 18. The outer surface of the screw 18 is provided with two mutually staggered thread grooves. The bottom thread of the screw 18 penetrates the bottom of the top cover 2, and the bottom of the screw 18 is rotatably connected to the top of the pressing plate 16. The top of the pressing plate 16 is provided with a through groove 17 through the bottom. The shape of the through groove 17 is consistent with the overall top view shape of the sleeve 8 and the pair of stirring blades 10. When the stirring blade 10 has completed stirring and reset, the stirring blade 10 is located directly below the through groove 17, and at this time, the two power gears 19 are synchronously driven to rotate. Since the screw 18 is threadedly connected to the power gear 19, the rotation of the power gear 19 will drive the screw 18 to rotate and move downward. The two screws 18 move downward together, which can drive the pressing plate 16 to descend at a uniform speed, and then squeeze the prepared reactants along the way and move downward together. At this time, the discharge pipe 5 is opened to discharge the reactants quickly. Therefore, the viscosity of the reactants is relatively large. Through traditional gravity discharge, the efficiency is not only greatly reduced, but also easy to have residues. During the descent of the pressing plate 16, the reactants adhering to the inner wall of the pulping tank 1 can also be scraped off together to avoid reactant residues. Moreover, since the shape of the through groove 17 is consistent with the overall top-view shape of the sleeve 8 and a pair of stirring blades 10, the reactants adhering to the surfaces of the stirring blade 10 and the sleeve 8 can also be scraped off together during the descent of the pressing plate 16.

[0039] See also Figure 8 and Fig.10 The preparation device of the fire-retardant coating also includes a toothed belt 20 for transmitting two power gears 19, a transmission gear 23 and a connecting block 28. A toothed belt 20 is meshingly provided between the two power gears 19. The top of the top cover 2 is located inside the toothed belt 20 and is rotatably connected with the transmission gear 23. The transmission gear 23 is meshingly connected with the toothed belt 20. The top of the rotating shaft 9 passes through the bottom of the top cover 2 and is fixedly connected with the connecting block 28 inside.

[0040] Embodiment 5, on the basis of embodiment 3 and 4, as Figure 8-Figure 13As shown, the preparation device of the fire retardant coating also includes a switching structure 24, the switching structure 24 is arranged inside the transmission gear 23 and the connecting block 28, and the two switching structures 24 are in an upside-down relationship, the switching structure 24 includes a rotating block 25 and a transmission tooth groove 26, the transmission tooth groove 26 is opened inside the transmission gear 23 and passes through the top and the bottom, the rotating block 25 is located inside the transmission tooth groove 26, a plurality of placement grooves 29 are opened inside the rotating block 25 through the outer surface, the inside of the placement groove 29 passes through the outer surface of the rotating block 25 and is rotatably connected with a transmission block 30, a group of springs 31 are fixedly connected between the side of the transmission block 30 and the inside of the placement groove 29, the transmission tooth groove 26 is composed of a plurality of inclined surfaces and vertical surfaces, and the transmission block 30 is adaptively matched with the transmission tooth groove 26.

[0041] When the output shaft of the motor 22 rotates counterclockwise, the two rotating blocks 25 are driven to rotate counterclockwise together through the connecting shaft 27. In this process, the inclined surfaces of the several transmission blocks 30 near the top contact and squeeze the inclined surfaces of the transmission tooth grooves 26, so that the transmission blocks 30 rotate and completely enter the interior of the placement groove 29, so that the rotating block 25 near the top rotates counterclockwise, unable to drive the transmission gear 23 to rotate, and further unable to drive the discharging structure 6 to operate. The vertical surfaces of the several transmission blocks 30 near the bottom contact and squeeze the inclined surfaces of the transmission tooth grooves 26 near the bottom, so that the rotating block 25 near the bottom rotates counterclockwise, and thus the rotating block 25 near the bottom rotates counterclockwise, driving the connecting block 28 to rotate counterclockwise together, and further driving the multiple stirring structures 15 to operate; When the output shaft of the motor 22 rotates clockwise, similarly to the above, the rotating block 25 near the top can rotate along the same direction to drive the transmission gear 23 to rotate clockwise, thereby driving the discharging structure 6 to operate, while the rotating block 25 near the bottom cannot rotate along the same direction to drive the connecting block 28 to rotate clockwise, thereby failing to drive the multiple stirring structures 15 to operate; Therefore, when the output shaft of the motor 22 rotates clockwise, the discharging structure 6 is driven to operate and the multiple stirring structure 15 stops operating. When the output shaft of the motor 22 rotates counterclockwise, the multiple stirring structure 15 is driven to operate and the discharging structure 6 stops operating.

[0042] like Figure 8-Figure 10 As shown, the preparation device of the fire-retardant coating also includes a motor 22, a connecting shaft 27 and a mounting frame 21 for driving the rotating block 25 to rotate. The top of the top cover 2 is located on the top of the transmission gear 23 and is fixedly connected to the mounting frame 21. The top of the mounting frame 21 is fixedly connected to the motor 22. The connecting shaft 27 is fixedly connected between the two rotating blocks 25. The output shaft of the motor 22 passes through the bottom of the mounting frame 21, and the output shaft of the motor 22 is fixedly connected to the top of the connecting shaft 27.

[0043] It should be understood that the above description is only for exemplary purposes and is not meant to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will be included within the scope of the claims herein.

Claims

1. A fire retardant coating, characterized in that: The invention is composed of the following ingredients in parts by mass: 20-30 parts of aluminum hydroxide, 15-25 parts of ammonium polyphosphate, 10-20 parts of pentaerythritol, 8-16 parts of melamine and 5-10 parts of titanium dioxide.

2. The fire retardant coating according to claim 1, characterized in that: Aluminum hydroxide 25 parts, ammonium polyphosphate 20 parts, pentaerythritol 15 parts, melamine 12 parts and titanium dioxide 8 parts.

3. A method for preparing a fire-retardant coating according to any one of claims 1 to 2, characterized in that: The fire-retardant coating is prepared by a fire-retardant coating preparation device. The fire-retardant coating preparation device comprises a pulping tank (1), a top cover (2), a threaded pipe (3), a feed pipe (4), a discharge pipe (5), an interlayer (7) and a multiple stirring structure (15). The top cover (2) is installed on the top of the pulping tank (1), the interlayer (7) is opened inside the wall of the pulping tank (1), the threaded pipe (3) is fixedly installed inside the interlayer (7), and both ends of the threaded pipe (3) pass through the outer surface of the pulping tank (1), the feed pipe (4) is fixedly installed on the outer surface of the pulping tank (1), and one end of the feed pipe (4) passes through the inside of the pulping tank (1), the discharge pipe (5) is fixedly installed on the bottom of the pulping tank (1), and the top of the discharge pipe (5) passes through the inside of the pulping tank (1), and the multiple stirring structure (15) is arranged inside the pulping tank (1).

4. The method for preparing a fire-retardant coating according to claim 3, characterized in that: The preparation method of the fire-retardant coating specifically comprises the following steps: ① weighing aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine and titanium dioxide as raw materials according to the formula amount, and adding the raw materials to a pulping tank (1) in sequence; ② starting the multiple stirring structure (15), stirring and mixing the raw materials fully, mixing 20 kg of the raw materials with 80 kg of 40° C. deionized water in the pulping tank (1), then adjusting the pH value to 4 with 10% phosphoric acid, adding 0.5-1.2 kg of a composite flame retardant synergist to dissolve, and reacting for 4 hours; ③ adjusting the pH value to 7 with a sodium hydroxide solution, adding a composite dispersant so that its mass percentage concentration in the solution is 0.5%, and placing the two ends of the threaded tube (3) in a slurry. The hot water circulation device at the end and the outside is connected, so that the pulping tank (1) stirs and disperses the raw materials at a temperature of 40°C for 6 hours; the composite dispersant is composed of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate, and the weight ratio of the sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate is 4:3:2; ④ open the discharge pipe (5), discharge the reaction substance from the inside of the pulping tank 1, and then ripen and filter it, collect the filtrate, adopt an inlet air temperature of 180°C, an outlet air temperature of 100°C, and a homogenizing pressure of 30MPa for spray drying, collect the dried powder, add an appropriate amount of solvent and thickener to prepare a fire retardant coating to obtain a fire retardant coating product.

5. The method for preparing a fire-retardant coating according to claim 3, characterized in that: The multiple stirring structure (15) comprises a stirring blade (10) for stirring raw materials, a sleeve (8), a rotating shaft (9), a bevel gear 1 (11), a bevel gear 2 (12), a connecting gear (13) and a connecting tooth groove (14); the rotating shaft (9) is rotatably connected between the bottom of the top cover (2) and the inside of the pulping tank (1); the sleeve (8) is rotatably connected between the bottom of the top cover (2) and the inside of the pulping tank (1) and located on the outer surface of the rotating shaft (9); the outer surface of the rotating shaft (9) is located inside the sleeve (8) and is equidistantly fixedly connected with three bevel gears 1 (11); the inside of the sleeve (8) is equidistantly rotatably connected with three pairs of bevel gears 2 (12); each bevel gear 2 (12) passes through the outer surface of the sleeve (8) and is fixedly connected with a stirring blade (10); the top and bottom of the sleeve (8) are provided with connecting tooth grooves (14); the outer surface of the rotating shaft (9) is located inside two connecting tooth grooves (14) and is fixedly connected with connecting gears (13).

6. The method for preparing a fire-retardant coating according to claim 5, characterized in that: The three pairs of bevel gears 2 (12) are respectively meshed and connected with the three bevel gears 1 (11), and the connecting gear (13) is meshed with the connecting tooth groove (14).

7. The method for preparing a fire-retardant coating according to claim 5, characterized in that: The device for preparing the fire-retardant coating further comprises a discharge structure (6) which is arranged at the bottom of the top cover (2) and is convenient for discharge. The discharge structure (6) comprises a pressing plate (16), the pressing plate (16) being located at the bottom of the top cover (2), the top of the top cover (2) being symmetrically rotatably connected to two power gears (19), the interiors of the two power gears (19) being threadedly connected to screw rods (18) passing through the tops, the outer surfaces of the screw rods (18) being provided with two mutually staggered thread grooves, the bottom threads of the screw rods (18) passing through the bottom of the top cover (2), and the bottom of the screw rods (18) being rotatably connected to the top of the pressing plate (16), the top of the pressing plate (16) being provided with a through groove (17) passing through the bottom, the shape of the through groove (17) being consistent with the overall top view shape of the sleeve (8) and the pair of stirring blades (10).

8. The method for preparing a fire-retardant coating according to claim 7, characterized in that: The device for preparing the fire-retardant coating further comprises a toothed belt (20) for transmitting two power gears (19), a transmission gear (23) and a connecting block (28); a toothed belt (20) is provided in a meshing sleeve between the two power gears (19); a transmission gear (23) is rotatably connected to the top of the top cover (2) and located inside the toothed belt (20); the transmission gear (23) is meshingly connected to the toothed belt (20); and a top of the rotating shaft (9) passes through the bottom of the top cover (2) and is fixedly connected to the connecting block (28) located inside.

9. The method for preparing a fire-retardant coating according to claim 8, characterized in that: The fire-retardant coating preparation device further comprises a switching structure (24). The transmission gear (23) and the connecting block (28) are both provided with the switching structure (24), and the two switching structures (24) are in an upside-down relationship. The switching structure (24) comprises a rotating block (25) and a transmission tooth groove (26). The transmission tooth groove (26) is provided inside the transmission gear (23) and passes through the top and the bottom. The rotating block (25) is located inside the transmission tooth groove (26). A plurality of placement grooves (29) are provided inside the rotating block (25) and pass through the outer surface. A transmission block (30) is rotatably connected inside the placement groove (29) and passes through the outer surface of the rotating block (25). A group of springs (31) are fixedly connected between the side surface of the transmission block (30) and the inside of the placement groove (29). The transmission tooth groove (26) is composed of a plurality of inclined surfaces and vertical surfaces. The transmission block (30) and the transmission tooth groove (26) are adaptively matched.

10. A method for preparing the fire-retardant coating according to claim 9, characterized in that: The device for preparing the fire-retardant coating further comprises a motor (22) for driving the rotating block (25) to rotate, a connecting shaft (27) and a mounting frame (21); the top of the top cover (2) is located on the top of the transmission gear (23) and is fixedly connected to the mounting frame (21); the top of the mounting frame (21) is fixedly connected to the motor (22); the connecting shaft (27) is fixedly connected between the two rotating blocks (25); the output shaft of the motor (22) passes through the bottom of the mounting frame (21), and the output shaft of the motor (22) is fixedly connected to the top of the connecting shaft (27).

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