Phosphorus-nitrogen flame retardant polymer reaction device with pressure regulation function

Abstract

The phosphorus-nitrogen flame retardant polymer reaction device with the pressure regulation function comprises a mixing barrel, an opening is formed in the upper end of the mixing barrel, and a high-pressure cover door is installed in the opening; the mixing mechanism is used for fully mixing phosphorus-nitrogen flame retardants during production, the mixing mechanism comprises two rotating discs, the two rotating discs are rotationally connected with the inner side wall of the mixing barrel, a plurality of stirring shafts are rotationally connected between the two rotating discs, a plurality of stirring blades are fixedly mounted outside the stirring shafts, and the stirring blades are fixedly mounted on the rotating discs. The two ends of the multiple stirring shafts rotationally penetrate through the rotating discs, the multiple stirring shafts are in transmission connection through a first transmission mechanism, and the opposite ends of the two rotating discs are coaxially and fixedly connected with rotating shafts. The pressure in the mixing barrel can be adjusted, the production quality of phosphorus-nitrogen flame retardants is improved, the reaction speed of raw materials can be increased, and the production efficiency of the phosphorus-nitrogen flame retardants can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of phosphorus-nitrogen flame retardant production equipment, and in particular to a phosphorus-nitrogen flame retardant polymer reaction device with pressure regulation. Background Technology

[0002] Organophosphorus flame retardants generally possess advantages such as low smoke, non-toxicity, low halogen content, and halogen-free properties, aligning with the development direction of flame retardants and demonstrating promising prospects. Organophosphorus flame retardants include phosphate esters, phosphite esters, phosphonates, organic phosphate salts, as well as phosphorus heterocyclic compounds and polymeric phosphate esters. Organic phosphonic acid metal salts, as an emerging flame retardant, have attracted considerable attention. The mechanism of action of phosphorus additives involves the formation of a more structurally stable cross-linked solid substance or carbonized layer when the flame retardant is heated. The formation of the carbonized layer can, on the one hand, prevent further pyrolysis of the polymer, and on the other hand, prevent the internal thermal decomposition products from entering the gas phase and participating in the combustion process.

[0003] Existing phosphorus-nitrogen flame retardants are mostly produced under normal pressure, which is relatively low. This can easily lead to an insufficiently dense and uniform flame-retardant char layer produced during combustion, resulting in a decrease in flame-retardant performance. Currently, the raw material stirring efficiency for phosphorus-nitrogen flame retardants is not high, the raw material reaction is slow, and the production time is long, resulting in low production efficiency for phosphorus-nitrogen flame retardants.

[0004] To address these issues, we propose a pressure-regulated polymer reactor for phosphorus-nitrogen flame retardants. Utility Model Content

[0005] The purpose of this invention is to provide a pressure-regulated phosphorus-nitrogen flame retardant polymer reaction device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pressure-regulated phosphorus-nitrogen-based flame retardant polymer reaction apparatus, comprising,

[0008] A mixing tank, wherein the upper end of the mixing tank is provided with an opening, and a high-pressure cover door is installed in the opening;

[0009] A mixing mechanism is used to thoroughly mix phosphorus and nitrogen-based flame retardants during production. The mixing mechanism includes two turntables, both of which are rotatably connected to the inner wall of a mixing tank. Multiple stirring shafts are rotatably connected between the two turntables, and multiple stirring blades are fixedly installed on the outside of each stirring shaft. Both ends of each stirring shaft rotatably pass through the turntables, and the stirring shafts are connected to each other via a first transmission mechanism. A rotating shaft is coaxially fixedly connected to one of the opposite ends of the two turntables, and both rotating shafts rotatably pass through the mixing tank. Vertical plates are provided at both ends of the mixing tank, and both rotating shafts rotatably pass through the vertical plates. A transmission shaft rotatably passes through the two vertical plates, and the transmission shaft is connected to the two rotating shafts via a second transmission mechanism. A motor is mounted on one of the vertical plates, and the drive shaft of the motor is coaxially fixedly connected to the transmission shaft.

[0010] A pressure regulating mechanism is used to regulate the pressure inside the mixing tank. The pressure regulating mechanism includes a pressure regulating box that is fixedly connected to the side wall of the mixing tank. A one-way valve is provided between the pressure regulating box and the mixing tank. A pressure plate is slidably connected inside the pressure regulating box. A telescopic rod is fixedly connected inside the pressure regulating box. The two ends of the telescopic rod are fixedly connected to the pressure regulating box and the pressure plate, respectively. An air supply pipe is fixedly connected between the pressure regulating box and the pressure plate. A one-way valve is provided inside the air supply pipe.

[0011] Furthermore, the first transmission mechanism includes multiple gears, which are coaxially and fixedly connected to multiple stirring shafts respectively. The inner sidewall of the mixing tank is provided with annular tooth grooves, and the multiple gears are meshed with the annular tooth grooves.

[0012] Furthermore, the second transmission mechanism includes a first pulley and a second pulley, the first pulley being coaxially and fixedly connected to the transmission shaft, the second pulley being coaxially and fixedly connected to the rotating shaft, and the first pulley and the second pulley being connected by a synchronous belt drive.

[0013] Furthermore, the gas flow direction between the pressure regulating box and the mixing tank is from the pressure regulating box to the mixing tank, and the gas flow direction between the gas supply pipe and the pressure regulating box is from the gas supply pipe to the pressure regulating box.

[0014] Furthermore, the portion of the gas supply pipe located inside the pressure regulating box is a corrugated pipe.

[0015] Furthermore, multiple stirring blades located outside the same stirring shaft are arranged in an array.

[0016] Compared with the prior art, the beneficial effects of this utility model are at least as follows:

[0017] 1. By setting up a mixing mechanism, a motor drives a transmission shaft to rotate, which in turn drives two rotating shafts to rotate. These rotating shafts then drive two turntables to rotate, which in turn drive multiple stirring shafts to revolve. Simultaneously, as the turntables rotate, the gears rotate on their own axis due to the meshing of their tooth grooves. The gears then drive the stirring shafts to rotate on their own axis, which in turn drives the stirring blades to revolve and rotate. This process effectively mixes the raw materials for the production of phosphorus-nitrogen flame retardants, increases the reaction rate of the raw materials, and improves the production efficiency of phosphorus-nitrogen flame retardants.

[0018] 2. By setting up a pressure regulating mechanism, when the pressure in the mixing tank is insufficient, gas is supplied to the pressure regulating box through the gas supply pipe. When the gas pressure in the pressure regulating box is strong, the pressure plate is pushed by the telescopic rod to force the gas in the pressure regulating box into the mixing tank. Then the pressure plate is adjusted to its original position. At this time, the gas in the mixing tank will not flow back into the pressure regulating box under the action of the one-way valve. By repeating the above actions, the pressure in the mixing tank can be regulated, thereby increasing the pressure in the mixing tank and improving the quality of the phosphorus-nitrogen flame retardant. This allows it to produce a sufficient amount of uniform and dense char layer during subsequent combustion, effectively achieving the flame retardant effect.

[0019] This invention can regulate the pressure inside the mixing tank, improve the production quality of phosphorus-nitrogen flame retardants, and increase the reaction rate of raw materials, thereby improving the production efficiency of phosphorus-nitrogen flame retardants. Attached Figure Description

[0020] Figure 1 This is a front structural diagram of the present invention;

[0021] Figure 2 for Figure 1 Sectional view along line AA;

[0022] Figure 3 for Figure 1 Sectional view along the BB direction;

[0023] Figure 4 This is a perspective view of the pressure regulating mechanism in this utility model.

[0024] The diagram shows: 1. Mixing tank; 2. High-pressure cover; 3. Mixing mechanism; 4. Turntable; 5. Stirring shaft; 6. Stirring blade; 7. First transmission mechanism; 8. Rotating shaft; 9. Vertical plate; 10. Transmission shaft; 11. Second transmission mechanism; 12. Motor; 13. Pressure regulating mechanism; 14. Pressure regulating box; 15. Pressure plate; 16. Telescopic rod; 17. Air supply pipe; 18. Gear; 19. First pulley; 20. Second pulley. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0026] Please see Figures 1-4 A pressure-regulated phosphorus-nitrogen-based flame retardant polymer reaction apparatus, comprising,

[0027] Mixing tank 1, with an opening at the top and a high-pressure cover 2 installed inside the opening;

[0028] To improve the production efficiency of phosphorus-nitrogen flame retardants, a mixing mechanism 3 is provided for thorough mixing of the phosphorus-nitrogen flame retardants. The mixing mechanism 3 includes two turntables 4, both rotatably connected to the inner wall of the mixing tank 1. Multiple stirring shafts 5 are rotatably connected between the two turntables 4, and multiple stirring blades 6 are fixedly installed on the outside of each stirring shaft 5. It should be noted that the multiple stirring blades 6 located outside the same stirring shaft 5 are arranged in an array. Both ends of the multiple stirring shafts 5 are rotatably connected through the turntables 4. The multiple stirring shafts 5 are connected to each other via a first transmission mechanism 7. Specifically, the first transmission mechanism 7 includes multiple gears 18, each coaxially fixedly connected to the multiple stirring shafts 5. The inner wall of the mixing tank 1 is provided with annular toothed grooves, and the multiple gears 18 are all connected to the stirring shafts 5. The two turntables 4 are connected by a ring-shaped toothed meshing connection. The two opposite ends of each turntable 4 are coaxially fixedly connected to a rotating shaft 8. Both rotating shafts 8 are rotatably connected through the mixing tank 1. Both ends of the mixing tank 1 are provided with vertical plates 9. Both rotating shafts 8 are rotatably connected through the vertical plates 9. A transmission shaft 10 is rotatably connected between the two vertical plates 9. The transmission shaft 10 and the two rotating shafts 8 are connected by a second transmission mechanism 11. It is worth mentioning that the second transmission mechanism 11 includes a first pulley 19 and a second pulley 20. The first pulley 19 is coaxially fixedly connected to the transmission shaft 10, and the second pulley 20 is coaxially fixedly connected to the rotating shaft 8. The first pulley 19 and the second pulley 20 are connected by a synchronous belt. A motor 12 is installed on one of the vertical plates 9. The drive shaft of the motor 12 is coaxially fixedly connected to the transmission shaft 10.

[0029] Through the above technical features, the motor 12 drives the transmission shaft 10 to rotate, the transmission shaft 10 drives two rotating shafts 8 to rotate, the rotating shafts 8 drive two turntables 4 to rotate, and the two turntables 4 drive multiple stirring shafts 5 to revolve. At the same time, during the rotation of the turntables 5, the gears 18 will rotate on their own axis under the meshing action of the tooth grooves. At this time, the gears 18 can drive the stirring shafts 5 to rotate on their own axis, and the stirring shafts 5 can drive the stirring blades 6 to revolve and rotate on their own axis. This can fully stir the raw materials for the production of phosphorus and nitrogen flame retardants and improve the production efficiency of phosphorus and nitrogen flame retardants.

[0030] To improve the production quality of phosphorus-nitrogen flame retardants, a pressure regulating mechanism 13 is provided to regulate the pressure inside the mixing tank 1. The pressure regulating mechanism 13 includes a pressure regulating box 14 fixedly connected to the side wall of the mixing tank 1. It should be noted that the gas flow direction between the pressure regulating box 14 and the mixing tank 1 is from the pressure regulating box 14 to the mixing tank 1, and the gas flow direction between the gas supply pipe 17 and the pressure regulating box 14 is from the gas supply pipe 17 to the pressure regulating box 14. A one-way valve is provided between the pressure regulating box 14 and the mixing tank 1. A pressure plate 15 is sealed and slidably connected inside the pressure regulating box 14. A telescopic rod 16 is fixedly connected inside the pressure regulating box 14. The two ends of the telescopic rod 16 are fixedly connected to the pressure regulating box 14 and the pressure plate 15, respectively. A gas supply pipe 17 is fixedly connected between the pressure regulating box 14 and the pressure plate 15. A one-way valve is provided inside the gas supply pipe 17. It should be noted that the part of the gas supply pipe 17 located inside the pressure regulating box 14 is a corrugated pipe.

[0031] Through the above technical features, when the pressure in the mixing tank 1 is insufficient, gas is supplied to the pressure regulating box 14 through the gas supply pipe 17. When the gas pressure in the pressure regulating box 14 is strong, the pressure plate 15 is pushed by the telescopic rod 16 to force the gas in the pressure regulating box 14 into the mixing tank 1. Then the pressure plate 15 is adjusted to its original position. At this time, the gas in the mixing tank 1 will not flow back into the pressure regulating box 14 under the action of the one-way valve. By repeating the above actions, the pressure in the mixing tank 1 can be regulated. Increasing the pressure in the mixing tank 1 can improve the quality of the phosphorus-nitrogen flame retardant.

[0032] Working principle:

[0033] 1) Production of phosphorus and nitrogen-based flame retardants: The motor 12 drives the transmission shaft 10 to rotate, the transmission shaft 10 drives two rotating shafts 8 to rotate, the rotating shafts 8 drive two turntables 4 to rotate, the two turntables 4 drive multiple stirring shafts 5 to revolve. At the same time, during the rotation of the turntables 5, the gears 18 will rotate on their own axis under the meshing action of the tooth grooves. At this time, the gears 18 can drive the stirring shafts 5 to rotate on their own axis, and the stirring shafts 5 can drive the stirring blades 6 to revolve and rotate on their own axis.

[0034] The pressure inside the mixing tank 1 is adjusted as follows: When the pressure inside the mixing tank 1 is insufficient, gas is supplied to the pressure regulating box 14 through the gas supply pipe 17. When the gas pressure inside the pressure regulating box 14 is strong, the pressure plate 15 is pushed through the telescopic rod 16 to force the gas in the pressure regulating box 14 into the mixing tank 1. Then the pressure plate 15 is adjusted to its original position. At this time, the gas in the mixing tank 1 will not flow back into the pressure regulating box 14 under the action of the one-way valve. By repeating the above actions, the pressure inside the mixing tank 1 can be adjusted. Increasing the pressure inside the mixing tank 1 can improve the quality of the phosphorus-nitrogen flame retardant.

[0035] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0036] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pressure-regulated polymer reaction apparatus for phosphorus and nitrogen-based flame retardants, characterized in that: include, A mixing tank (1) has an opening at its upper end, and a high-pressure cover door (2) is installed in the opening. A mixing mechanism (3) is used to fully mix phosphorus-nitrogen flame retardants. The mixing mechanism (3) includes two turntables (4), both of which are rotatably connected to the inner wall of the mixing tank (1). Multiple stirring shafts (5) are rotatably connected between the two turntables (4). Multiple stirring blades (6) are fixedly installed on the outside of each stirring shaft (5). Both ends of the stirring shafts (5) are rotatably connected through the turntables (4). The stirring shafts (5) are connected to each other through a first transmission mechanism (7). The two turntables (4) are located at opposite ends. Both shafts (8) are coaxially fixedly connected, and both shafts (8) are rotatably connected through the mixing tank (1). Both ends of the mixing tank (1) are provided with vertical plates (9). Both shafts (8) are rotatably connected through the vertical plates (9). A transmission shaft (10) is rotatably connected between the two vertical plates (9). The transmission shaft (10) is connected to the two shafts (8) through a second transmission mechanism (11). A motor (12) is installed on one of the vertical plates (9). The drive shaft of the motor (12) is coaxially fixedly connected to the transmission shaft (10). A pressure regulating mechanism (13) is used to regulate the pressure inside the mixing tank (1). The pressure regulating mechanism (13) includes a pressure regulating box (14) that is fixedly connected to the side wall of the mixing tank (1). A one-way valve is provided between the pressure regulating box (14) and the mixing tank (1). A pressure plate (15) is sealed and slidably connected inside the pressure regulating box (14). A telescopic rod (16) is fixedly connected inside the pressure regulating box (14). The two ends of the telescopic rod (16) are fixedly connected to the pressure regulating box (14) and the pressure plate (15) respectively. An air supply pipe (17) is fixedly connected between the pressure regulating box (14) and the pressure plate (15). A one-way valve is provided inside the air supply pipe (17).

2. The phosphorus-nitrogen-based flame retardant polymer reaction apparatus with pressure regulation according to claim 1, characterized in that: The first transmission mechanism (7) includes multiple gears (18), which are coaxially fixedly connected to multiple stirring shafts (5). The inner side wall of the mixing tank (1) is provided with an annular tooth groove, and the multiple gears (18) are meshed with the annular tooth groove.

3. The phosphorus-nitrogen-based flame retardant polymer reaction apparatus with pressure regulation according to claim 1, characterized in that: The second transmission mechanism (11) includes a first pulley (19) and a second pulley (20). The first pulley (19) is coaxially and fixedly connected to the transmission shaft (10), and the second pulley (20) is coaxially and fixedly connected to the rotating shaft (8). The first pulley (19) and the second pulley (20) are connected by a synchronous belt drive.

4. The phosphorus-nitrogen-based flame retardant polymer reaction apparatus with pressure regulation according to claim 1, characterized in that: The gas flow direction between the pressure regulating box (14) and the mixing tank (1) is from the pressure regulating box (14) to the mixing tank (1), and the gas flow direction between the gas supply pipe (17) and the pressure regulating box (14) is from the gas supply pipe (17) to the pressure regulating box (14).

5. The phosphorus-nitrogen-based flame retardant polymer reaction apparatus with pressure regulation according to claim 1, characterized in that: The portion of the gas supply pipe (17) located inside the pressure regulating box (14) is a corrugated pipe.

6. The phosphorus-nitrogen-based flame retardant polymer reaction apparatus with pressure regulation according to claim 1, characterized in that: Multiple stirring blades (6) located outside the same stirring shaft (5) are arranged in an array.

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