Fireproof flame-retardant coating and preparation method thereof

Abstract

The application 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 by a preparation device of the fireproof flame-retardant coating and is 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 white powder. Through a multiple stirring structure, the stirring blade can be driven to rotate both around its own axis and around the axis of the device, so that the raw materials are doubly stirred, the raw materials are more fully and uniformly stirred and mixed, the components can fully play a role, and the quality stability and the consistency of the fireproof performance of the fireproof flame-retardant coating are ensured.

Description

Technical Field

[0001] This invention relates to the field of fire-retardant coating production technology, and in particular to a fire-retardant coating and its preparation method. Background Technology

[0002] Aluminum hydroxide is a common inorganic flame retardant. During heating, it decomposes, absorbing a large amount of heat and effectively reducing the surface temperature of materials. The water vapor produced during decomposition also dilutes the concentration of flammable gases in the surrounding air, thus providing flame retardancy. Ammonium polyphosphate, a highly efficient phosphorus-based flame retardant, is rich in phosphorus and nitrogen. Under high-temperature conditions, it releases substances such as phosphoric acid, which form a dense char layer on the material surface. This char layer not only isolates oxygen, preventing further combustion, but also blocks heat transfer to the interior, providing a good barrier to protect the substrate material. In recent years, with the continuous improvement of building safety regulations and the significant increase in public awareness of fire safety, the demand for fire-retardant coatings has increased dramatically. More and more construction projects, industrial facilities, and other fields urgently need efficient and reliable fire-retardant coatings to protect life and property. 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 their ability to enhance the overall performance of coatings.

[0003] Chinese patent publication 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 alternating long and short stirring blades along the vertical direction. A support pipe is fixed to one side of the top of the tank body. A connecting flange is fixed to the top of the support pipe. A feed pipe is provided inside the support pipe. Multiple powder discharge pipes are provided on the lower inner wall of the feed pipe. A fixing sleeve is fitted on the upper part of the feed pipe. A locking bolt is provided on the fixing sleeve. A connecting flange is fixed to the fixing sleeve. A powder conveying pipe is connected to the top of the feed pipe. A powder conveying pump is fixedly connected to the other end of the powder conveying pipe. A powder extraction pipe is connected to the inlet of the powder conveying pump.

[0004] The above-mentioned technical solution uses alternating long and short stirring blades installed along the axial direction of the stirring shaft to achieve more uniform mixing and better prevent solidification. In addition, it uses negative pressure suction to feed powder, and then sends the powder to the lower part of the liquid through the feed pipe and the powder outlet pipe for multi-layer distribution, which can facilitate subsequent stirring, mixing and pulping. However, it essentially only uses two stirring blades of different lengths to stir the material, so the stirring capacity is limited, and it cannot effectively stir materials with high viscosity. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a fire-retardant coating and its preparation method. Through a multi-stirring structure, the stirring blades can rotate both on their own axis and around the sun, achieving dual stirring of the raw materials. This makes the mixing of the raw materials more thorough and uniform, which is conducive to the full play of each component and ensures the quality stability and fire-retardant performance consistency of the coating.

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

[0007] To further explain, the composition includes 25 parts aluminum hydroxide, 20 parts ammonium polyphosphate, 15 parts pentaerythritol, 12 parts melamine, and 8 parts titanium dioxide.

[0008] A method for preparing a fire-retardant coating is disclosed. The fire-retardant coating is prepared using a fire-retardant coating preparation device, which includes a slurry tank, a top cover, a threaded pipe, a feed pipe, a discharge pipe, a jacket, and a multi-stage stirring structure. The top cover is installed on the top of the slurry tank. The jacket is formed inside the wall of the slurry tank. The threaded pipe is fixedly installed inside the jacket, with both ends of the threaded pipe penetrating the outer surface of the slurry tank. The feed pipe is fixedly installed on the outer surface of the slurry tank, with one end of the feed pipe penetrating the interior of the slurry tank. The discharge pipe is fixedly installed at the bottom of the slurry tank, with the top of the discharge pipe penetrating the interior of the slurry tank. The multi-stage stirring structure is disposed inside the slurry tank.

[0009] Further explanation: The preparation method of the fire-retardant coating specifically includes the following steps: ① Weigh aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine, and titanium dioxide according to the formula, and add the raw materials sequentially to the slurry tank; ② Start the multi-stage stirring structure to fully mix the raw materials, mix 20 kg of raw materials with 80 kg of 40℃ deionized water in the slurry tank, then adjust the pH value to 4 with 10% phosphoric acid, add 0.5-1.2 kg of composite flame retardant synergist for dissolution, and react for 4 hours; ③ Adjust the pH value to 7 with sodium hydroxide solution, add composite dispersant to make its mass percentage concentration in the solution 0.5%, and then add the two ends of the threaded pipe. The hot water circulation device at the end and the outside allows the raw materials in the pulping tank to be stirred and dispersed 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 to discharge the reacted substance into the pulping tank 1, and then perform aging and filtration treatment. Collect the filtrate, and spray dry it with an inlet air temperature of 180°C, an outlet air temperature of 100°C and a homogenization pressure of 30MPa. Collect the dried powder, add an appropriate amount of solvent and thickener to make a fire-retardant coating to obtain the fire-retardant coating product.

[0010] Further explanation: The multi-stage stirring structure includes stirring blades for stirring raw materials, a sleeve, a rotating shaft, bevel gear one, bevel gear two, connecting gears, and connecting tooth grooves. The bottom of the top cover is rotatably connected to the inside of the pulping tank via a rotating shaft. The bottom of the top cover is rotatably connected to the inside of the pulping tank via a sleeve located on the outer surface of the rotating shaft. Three bevel gears one are fixedly connected at equal intervals on the outer surface of the rotating shaft inside the sleeve. Three pairs of bevel gears two are rotatably connected at equal intervals inside the sleeve. Each bevel gear two has a stirring blade fixedly connected through the outer surface of the sleeve. Connecting tooth grooves are provided at the top and bottom of the sleeve. Connecting gears are fixedly connected to the outer surface of the rotating shaft inside the two connecting tooth grooves.

[0011] To further explain, the three pairs of bevel gears 2 are respectively meshed with the three bevel gears 1, and the connecting gear meshes with the connecting tooth groove.

[0012] Further explanation: the fire-retardant coating preparation device also includes a discharge structure located at the bottom of the top cover for easy material discharge. The discharge structure includes a pressure plate located at the bottom of the top cover. Two power gears are symmetrically rotatably connected to the top of the top cover. Both power gears are threadedly connected to a screw through the top of the top. The outer surface of the screw has two intersecting threaded grooves. The bottom of the screw is threaded through the bottom of the top cover and is rotatably connected to the top of the pressure plate. The top of the pressure plate has a through groove through the bottom. The shape of the through groove is consistent with the overall top view shape of the sleeve and a pair of stirring blades.

[0013] To further explain, the fire-retardant coating preparation device also includes a toothed belt for driving two power gears, a transmission gear, and a connecting block. The toothed belt is meshed between the two power gears. The transmission gear is rotatably connected to the top of the top cover and inside the toothed belt. The transmission gear meshes 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 fire-retardant coating preparation device also includes a switching structure. The transmission gear and the connecting block are both equipped with a switching structure, and the two switching structures are inverted. The switching structure includes a rotating block and a transmission tooth groove. The transmission tooth groove is opened inside the transmission gear and extends through the top and bottom. The rotating block is located inside the transmission tooth groove. The interior of the rotating block has several placement slots that extend through its outer surface. The interior of the placement slots extends through the outer surface of the rotating block and is rotatably connected to the transmission block. A set of springs is fixedly connected between the side of the transmission block and the interior of the placement slots. The transmission tooth groove is composed of several inclined surfaces and vertical surfaces. The transmission block and the transmission tooth groove are adaptively matched.

[0015] To further explain, the fire-retardant coating preparation device also includes a motor, a coupling shaft, and a mounting frame for driving the rotating blocks to rotate. The top of the top cover is fixedly connected to the top of the transmission gear, and the top of the mounting frame is fixedly connected to the motor. A coupling shaft 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 shaft.

[0016] The beneficial effects that can be achieved by the above embodiments of the present invention include:

[0017] 1. It adopts a multi-stage mixing structure consisting of a stirring blade, sleeve, rotating shaft, bevel gear one, bevel gear two, connecting gear and connecting tooth groove. The rotation of the rotating shaft can drive the stirring blade to both rotate on its own axis and revolve around the center, realizing dual mixing of raw materials. This makes the raw materials more thoroughly and evenly mixed, which is conducive to the full play of each component and ensures the quality stability and fireproof performance consistency of the fire-retardant coating.

[0018] 2. It is equipped with a discharge structure consisting of a pressure plate, a power gear, and a screw. In the case of highly viscous reactants, the pressure of the pressure plate can not only quickly squeeze and discharge the prepared reactants, improving the discharge efficiency, but also scrape off the reactants adhering to the inner wall of the slurry tank, the surface of the stirring blades, and the surface of the sleeve, avoiding reactant residue, ensuring that the fireproof and flame-retardant coating can be completely collected, guaranteeing production and facilitating subsequent use performance.

[0019] 3. The configuration of the switching structure enables the switching control of the working state of the discharge structure and the multiple stirring structure by rotating the motor output shaft in different directions. This ensures that stirring and discharge operations are carried out at appropriate stages, avoiding mutual interference and making the entire preparation process more orderly and efficient. This further guarantees the smooth progress of the fire-retardant coating production process and the quality of the final product. In addition, only one power input is needed to control the operation of the multiple stirring structure and the discharge structure, thus reducing energy consumption. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a cross-sectional view of the top cover and slurry tank of the present invention.

[0022] Figure 3 This is a schematic diagram of the multi-stirring structure after the sleeve is dissected according to the present invention.

[0023] Figure 4 This is an exploded view of the shaft and sleeve structure of the present invention.

[0024] Figure 5 This is a diagram illustrating the material discharge structure after the top cover of the present invention has been dissected.

[0025] Figure 6 For the present invention Figure 5 Enlarged view of part A.

[0026] Figure 7 This is a top view of the pressure plate and stirring blade of the present invention after disassembly.

[0027] Figure 8 This is a diagram showing the transmission gear structure after the mounting bracket of the present invention has been disassembled.

[0028] Figure 9 For the present invention Figure 8 Enlarged view of part B.

[0029] Figure 10 This is a schematic diagram illustrating the connecting block and transmission gear structure of the present invention.

[0030] Figure 11 This is a top-view comparison of the two switching structures of the present invention.

[0031] Figure 12 An exploded view of the switching structure of this invention.

[0032] Figure 13 For the present invention Figure 12 Enlarged view of part C.

[0033] In the attached diagrams: 1. Pulping tank; 2. Top cover; 3. Threaded pipe; 4. Feed pipe; 5. Discharge pipe; 6. Discharge structure; 7. Jacket; 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. Pressure plate; 17. Through groove; 18. Screw; 19. Power gear; 20. Toothed belt; 21. Mounting bracket; 22. Motor; 23. Transmission gear; 24. Switching structure; 25. Rotating block; 26. Transmission tooth groove; 27. Coupling shaft; 28. Connecting block; 29. ​​Placement groove; 30. Transmission block; 31. Spring. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0035] Example 1: A fire-retardant coating, composed of the following components by weight: 20-30 parts aluminum hydroxide, 15-25 parts ammonium polyphosphate, 10-20 parts pentaerythritol, 8-16 parts melamine and 5-10 parts titanium dioxide.

[0036] The mixture contains 25 parts aluminum hydroxide, 20 parts ammonium polyphosphate, 15 parts pentaerythritol, 12 parts melamine, and 8 parts titanium dioxide.

[0037] Example 2: Based on Example 1, such as Figure 1 and 2 As shown, the fire-retardant coating is prepared by a fire-retardant coating preparation device, which includes a slurry tank 1, a top cover 2, a threaded pipe 3, a feed pipe 4, a discharge pipe 5, a jacket 7, and a multi-stirring structure 15. The top cover 2 is installed on the top of the slurry tank 1. The jacket 7 is opened inside the wall of the slurry tank 1. The threaded pipe 3 is fixedly installed inside the jacket 7, and both ends of the threaded pipe 3 penetrate the outer surface of the slurry tank 1. The feed pipe 4 is fixedly installed on the outer surface of the slurry tank 1, and one end of the feed pipe 4 penetrates the interior of the slurry tank 1. The discharge pipe 5 is fixedly installed at the bottom of the slurry tank 1, and the top of the discharge pipe 5 penetrates the interior of the slurry tank 1. The multi-stirring structure 15 is set inside the slurry tank 1.

[0038] The preparation method specifically includes the following steps: ① Weigh aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine, and titanium dioxide according to the formula, and add the raw materials to the pulping tank 1 in sequence; ② Start the multi-stage stirring structure 15 to fully stir and mix the raw materials. In the pulping tank 1, mix 20 kg of raw materials with 80 kg of 40℃ deionized water, then adjust the pH value to 4 with 10% phosphoric acid, add 0.5-1.2 kg of composite flame retardant synergist for dissolution, and react for 4 hours; ③ Adjust the pH value to 7 with sodium hydroxide solution, add composite dispersant to make its mass percentage concentration in the solution 0.5%, and connect both ends of the threaded tube 3 to the outer... The hot water circulation device of the part allows the raw materials in the pulping tank 1 to be stirred and dispersed at a temperature of 40°C for 6 hours; the composite dispersant is composed of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate, with a weight ratio of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate of 4:3:2; ④ Open the discharge pipe 5 to discharge the reaction-obtained substance from the pulping tank 1, and then perform aging and filtration treatment, collect the filtrate, and spray dry it with an inlet air temperature of 180°C, an outlet air temperature of 100°C and a homogenization pressure of 30MPa. Collect the dried powder, add an appropriate amount of solvent and thickener to formulate a fire-retardant coating product.

[0039] Example 3, based on Example 2, such as Figures 2-4 As shown, the multi-stage stirring structure 15 includes stirring blades 10 for stirring raw materials, sleeve 8, rotating shaft 9, bevel gear 11, bevel gear 2 12, connecting gear 13, and connecting tooth groove 14. The bottom of the top cover 2 is rotatably connected to the inside of the pulping tank 1. The bottom of the top cover 2 is rotatably connected to the inside of the pulping tank 1 and to the outer surface of the rotating shaft 9. Three bevel gears 11 are fixedly connected at equal intervals to the outer surface of the rotating shaft 9 inside the sleeve 8. Three pairs of bevel gears 2 12 are rotatably connected at equal intervals inside the sleeve 8. Each bevel gear 2 12 is fixedly connected to the stirring blade 10 through the outer surface of the sleeve 8. Connecting tooth grooves 14 are provided at the top and bottom of the sleeve 8. Connecting gears 13 are fixedly connected to the outer surface of the rotating shaft 9 inside the two connecting tooth grooves 14.

[0040] Rotating the shaft 9 drives the three bevel gears 11 to rotate, which in turn drives all the stirring blades 10 to rotate via the three pairs of bevel gears 12. At the same time, the shaft 9 drives the two connecting gears 13 to rotate as well, which in turn drives the sleeve 8 to rotate via the two connecting tooth grooves 14. The rotation of the sleeve 8 will cause all the stirring blades 10 to revolve around the center of the sleeve 8. Therefore, the rotation of the shaft 9 will cause all the stirring blades 10 to rotate on their own axis and revolve around the center of the sleeve 8, thereby increasing the ways in which the stirring blades 10 can stir the raw materials, and performing double stirring on the raw materials.

[0041] like Figure 4As shown, three pairs of bevel gears 12 are respectively meshed with three bevel gears 11, and the connecting gear 13 meshes with the connecting tooth groove 14.

[0042] Example 4: Based on Example 2, such as Figure 5 The fire-retardant coating preparation device shown also includes a discharge structure 6 located at the bottom of the top cover 2 for easy discharge. The discharge structure 6 includes a pressure plate 16, which is located at the bottom of the top cover 2. Two power gears 19 are symmetrically rotatably connected to the top of the top cover 2. The two power gears 19 are threaded through the top of the top and threaded with screws 18. The outer surface of the screws 18 is provided with two intersecting threaded grooves. The bottom of the screws 18 is threaded through the bottom of the top cover 2 and is rotatably connected to the top of the pressure plate 16. The top of the pressure 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 a pair of stirring blades 10.

[0043] When the stirring blade 10 finishes stirring and resets, it is located directly below the through groove 17. At this time, it synchronously drives the two power gears 19 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 pressure plate 16 to descend at a uniform speed, thereby squeezing the prepared reactants along the way and moving them downward together. At this time, the discharge pipe 5 is opened to quickly discharge the reactants. Therefore, the reactants are highly viscous. Traditional gravity discharge is not only inefficient but also prone to residue. During the descent of the pressure plate 16, the reactants adhering to the inner wall of the pulping tank 1 can also be scraped off to avoid reactant residue. Since 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, the reactants adhering to the surface of the stirring blade 10 and the surface of the sleeve 8 can also be scraped off during the descent of the pressure plate 16.

[0044] See Figure 8 and Figure 10 The device for preparing fire-retardant coatings also includes a toothed belt 20 for driving two power gears 19, a transmission gear 23, and a connecting block 28. The toothed belt 20 is meshed between the two power gears 19. The transmission gear 23 is rotatably connected to the top of the top cover 2 and inside the toothed belt 20. The transmission gear 23 is meshed 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 to the connecting block 28 inside.

[0045] Example 5, based on Examples 3 and 4, such as Figures 8-13As shown, the fire-retardant coating preparation device also includes a switching structure 24. The transmission gear 23 and the connecting block 28 are both equipped with the switching structure 24, 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 extends through the top and bottom. The rotating block 25 is located inside the transmission tooth groove 26. The interior of the rotating block 25 has several placement grooves 29 that extend through its outer surface. The interior of the placement groove 29 extends through the outer surface of the rotating block 25 and is rotatably connected to a transmission block 30. A set of springs 31 is fixedly connected between the side of the transmission block 30 and the interior of the placement groove 29. The transmission tooth groove 26 is composed of several inclined surfaces and vertical surfaces. The transmission block 30 and the transmission tooth groove 26 are adaptively matched.

[0046] When the output shaft of motor 22 rotates counterclockwise, it drives two rotating blocks 25 to rotate counterclockwise together through the connecting shaft 27. During this process, the inclined surfaces of several transmission blocks 30 at the top contact and press with the inclined surfaces of the transmission tooth groove 26, causing the transmission blocks 30 to rotate and completely enter the interior of the placement groove 29. Therefore, the rotating blocks 25 at the top rotate counterclockwise and cannot drive the transmission gear 23 to rotate, thus preventing the discharge structure 6 from operating. The vertical surfaces of several transmission blocks 30 at the bottom contact and press with the inclined surfaces of the transmission tooth groove 26 at the bottom, causing the rotating blocks 25 at the bottom to rotate counterclockwise. This causes the rotating blocks 25 at the bottom to rotate counterclockwise, driving the connecting block 28 to rotate counterclockwise together, thereby driving the multi-stirring structure 15 to operate.

[0047] When the output shaft of motor 22 rotates clockwise, similarly to the above, the rotating block 25 at the top rotates clockwise and drives the transmission gear 23 to rotate clockwise, thereby driving the discharge structure 6 to operate. The rotating block 25 at the bottom cannot drive the connecting block 28 to rotate clockwise, thereby not driving the multi-mixing structure 15 to operate.

[0048] Therefore, when the output shaft of motor 22 rotates clockwise, it drives the discharge structure 6 to operate, and the multi-stage mixing structure 15 stops operating. When the output shaft of motor 22 rotates counterclockwise, it drives the multi-stage mixing structure 15 to operate, and the discharge structure 6 stops operating.

[0049] like Figures 8-10 As shown, the fire-retardant coating preparation device also includes a motor 22, a coupling 27, and a mounting bracket 21 for driving the rotating block 25 to rotate. The top of the top cover 2 is fixedly connected to the top of the transmission gear 23, and the top of the mounting bracket 21 is fixedly connected to the motor 22. The coupling 27 is fixedly connected between the two rotating blocks 25. The output shaft of the motor 22 passes through the bottom of the mounting bracket 21, and the output shaft of the motor 22 is fixedly connected to the top of the coupling 27.

[0050] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A method for preparing a fire-retardant coating, characterized in that: The fire-retardant coating is composed of the following components by weight: 20-30 parts aluminum hydroxide, 15-25 parts ammonium polyphosphate, 10-20 parts pentaerythritol, 8-16 parts melamine, and 5-10 parts titanium dioxide. The fire-retardant coating is prepared using a fire-retardant coating preparation device, which includes a slurry tank, a top cover, a threaded pipe, a feed pipe, a discharge pipe, a jacket, and a multi-stage stirring structure. The top cover is installed on the top of the slurry tank. The jacket is located inside the wall of the slurry tank. The threaded pipe is fixedly installed inside the jacket, with both ends penetrating the outer surface of the slurry tank. The feed pipe is fixedly installed on the outer surface of the slurry tank, with one end penetrating the interior of the slurry tank. The discharge pipe is fixedly installed at the bottom of the slurry tank, with its top penetrating the interior of the slurry tank. The multi-stage stirring structure is located inside the slurry tank. The multi-stage stirring structure includes stirring blades for stirring raw materials, a sleeve, a rotating shaft, bevel gear one, bevel gear two, connecting gears, and connecting tooth grooves. The bottom of the top cover is rotatably connected to the inside of the pulping tank via a rotating shaft. The bottom of the top cover is rotatably connected to the inside of the pulping tank via a sleeve located on the outer surface of the rotating shaft. Three bevel gears one are fixedly connected at equal intervals on the outer surface of the rotating shaft inside the sleeve. Three pairs of bevel gears two are rotatably connected at equal intervals inside the sleeve. Each bevel gear two is fixedly connected to a stirring blade through the outer surface of the sleeve. Connecting tooth grooves are provided at the top and bottom of the sleeve. Connecting gears are fixedly connected to the outer surface of the rotating shaft inside the two connecting tooth grooves. The fire-retardant coating preparation device also includes a discharge structure located at the bottom of the top cover for easy discharge. The discharge structure includes a pressure plate located at the bottom of the top cover. Two power gears are symmetrically rotatably connected to the top of the top cover. Both power gears are threaded through the top of the top and connected to a screw. The outer surface of the screw has two intersecting threaded grooves. The bottom of the screw is threaded through the bottom of the top cover and rotatably connected to the top of the pressure plate. The top of the pressure plate has a through groove through the bottom. The shape of the through groove is consistent with the overall top view shape of the sleeve and a pair of stirring blades. The fireproof and flame-retardant coating preparation device also includes a toothed belt for driving two power gears, a transmission gear and a connecting block. The toothed belt is meshed between the two power gears. The transmission gear is rotatably connected to the top of the top cover and inside the toothed belt. The transmission gear meshes 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. The fire-retardant coating preparation device also includes a switching structure. The transmission gear and the connecting block are both equipped with a switching structure, and the two switching structures are inverted. The switching structure includes a rotating block and a transmission tooth groove. The transmission tooth groove is opened inside the transmission gear and extends through the top and bottom. The rotating block is located inside the transmission tooth groove. The interior of the rotating block has several placement slots that extend through the outer surface. The interior of the placement slots extends through the outer surface of the rotating block and is rotatably connected to the transmission block. A set of springs is fixedly connected between the side of the transmission block and the interior of the placement slots. The transmission tooth groove is composed of several inclined surfaces and vertical surfaces. The transmission block and the transmission tooth groove are adaptively matched.

2. The method for preparing a fire-retardant coating according to claim 1, characterized in that: The preparation method of fire-retardant coatings specifically includes the following steps: ① Weigh aluminum hydroxide, ammonium polyphosphate, pentaerythritol, melamine, and titanium dioxide according to the formula, and add the raw materials to the slurry tank in sequence; ② Start the multi-stage stirring structure to fully stir and mix the raw materials. In the slurry tank, mix 20 kg of raw materials with 80 kg of 40℃ deionized water, then adjust the pH value to 4 with 10% phosphoric acid, add 0.5-1.2 kg of composite flame retardant synergist for dissolution, and react for 4 hours; ③ Adjust the pH value to 7 with sodium hydroxide solution, add composite dispersant to make its mass percentage concentration in the solution 0.5%, and connect both ends of the threaded pipe to the outer... The hot water circulation device of the part allows the raw materials in the pulping tank to be stirred and dispersed 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 to discharge the reaction-obtained substance from the pulping tank 1, and then perform aging and filtration treatment, collect the filtrate, and spray dry it with an inlet air temperature of 180°C, an outlet air temperature of 100°C and a homogenization pressure of 30MPa. Collect the dried powder, add an appropriate amount of solvent and thickener to formulate a fire-retardant coating to obtain the fire-retardant coating product.

3. The method for preparing a fire-retardant coating according to claim 1, characterized in that: The three pairs of bevel gears 2 are respectively meshed with the three bevel gears 1, and the connecting gears mesh with the connecting tooth grooves.

4. A method for preparing the fire-retardant coating according to claim 1, characterized in that: The fire-retardant coating preparation device also includes a motor, a coupling shaft, and a mounting frame for driving the rotating blocks to rotate. The top of the top cover is fixedly connected to the top of the transmission gear, and the top of the mounting frame is fixedly connected to the motor. A coupling shaft 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 shaft.

5. A fire-retardant coating prepared by the preparation method according to any one of claims 1-4, characterized in that: The composition by weight is as follows: 20-30 parts aluminum hydroxide, 15-25 parts ammonium polyphosphate, 10-20 parts pentaerythritol, 8-16 parts melamine, and 5-10 parts titanium dioxide.

6. The fire-retardant coating according to claim 5, characterized in that: aluminum hydroxide 25 parts, ammonium polyphosphate 20 parts, pentaerythritol 15 parts, melamine 12 parts, and titanium dioxide 8 parts.

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