Semi-continuous para-aramid polymer preparation equipment

Abstract

The utility model relates to the technical field of para-aramid fiber preparation, in particular to semi-continuous para-aramid fiber polymer preparation equipment which comprises a stirring motor, a base, a stirring shaft, a stirring rod, stirring fan blades, a reaction kettle and a feeding port. The stirring shaft is fixedly connected with a plurality of stirring rods in a surrounding manner, the end part of each stirring rod is fixedly connected with a stirring fan blade, and the stirring fan blades are in a triangular blade shape with radian and are tangent to the inner wall of the reaction kettle, so that the triangular blade-shaped stirring fan blades with the radian can generate strong shearing force and turbulent flow in the stirring process and have a crushing effect; the feeding port of the device is provided with the rotating fan blades, so that the materials can be fed at a constant speed, the materials can be efficiently conveyed into the reactor from the feeding port, and the blockage phenomenon of the materials in the conveying process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of para-aramid preparation, in particular to a semi-continuous para-aramid polymer preparation device. Background Technique

[0002] Para-aramid, namely poly(p-phenylene terephthalamide) (PPTA) fiber, is a high-performance aromatic polyamide fiber. Due to the rigid benzene ring and strong polar amide bond in its molecular chain, and the high symmetry and regularity of the macromolecular skeleton, para-aramid fiber has the characteristics of high strength and high modulus, and has good heat resistance, chemical corrosion resistance, flame retardancy and other properties. Its modulus is 2-3 times that of steel wire and glass fiber, the specific strength is 5-6 times that of steel, the toughness is 2 times that of steel wire, and the density is only 1 / 5 of that of steel. Therefore, it can be widely used in special clothing, aerospace, sports goods, cables and composites, and is one of the varieties with the fastest development and the largest output in the world's high-tech fibers.

[0003] Stably preparing high-quality para-aramid polymer in production is an important prerequisite for preparing high-quality para-aramid fiber. At present, there are various methods for preparing para-aramid polymer, such as low-temperature solution polymerization, interfacial polymerization, melting, gas-phase polycondensation and inverse suspension polymerization. Among them, only the low-temperature solution polymerization process has formed industrialization. This method usually uses a kettle reactor as the polymerization reactor, but it has large heat release during the reaction, cannot accurately control the reaction temperature, has more side reactions at high temperature, affects the efficient progress of the polymerization reaction, results in a wide molecular weight distribution of the polymer, and the polymer viscosity is unstable.

[0004] The batch polymerization reactor is an efficient intensified polymerization process. Its principle is to use the dragging vortex to generate uniform mixing in the axial and radial directions to meet the requirements of the para-aramid polymerization reaction for uniform mixing, high shear stress and conveying capacity. Compared with the continuous polymerization reactor, the batch polymerization reactor can adjust the product specifications and quality between batches, and has the characteristics of flexible operation, variable production and low investment.

[0005] However, due to the characteristics of the reactor and the limitations of the operating conditions, the feed inlet of the current batch polymerization reactor is often prone to blockage during the raw material transportation process, affecting the reaction effect and product quality. The shape of the stirring fan blade of the polymerization reactor will directly affect the stirring efficiency. In the reactor stirring fan blade of this preparation method, it needs to be improved according to the actual situation. In view of this, a semi-continuous para-aramid polymer preparation device is provided. Content of the Utility Model

[0006] The main purpose of the utility model is to provide a semi-continuous para-aramid polymer preparation device to solve the problems raised in the related technology.

[0007] To achieve the above object, according to one aspect of the present utility model, there is provided a semi - continuous para - aramid polymer preparation device, including a stirring motor, a base, a stirring shaft, stirring rods, stirring fan blades, a reaction kettle, and a feeding port. The stirring motor is fixedly connected to the base, the output shaft of the stirring motor is fixedly connected to the stirring shaft, a number of stirring rods are fixedly connected around the stirring shaft in a circumferential manner, the end of each stirring rod is fixedly connected to a stirring fan blade, and the stirring fan blade is in the shape of a triangular blade with a curvature and is tangent to the inner wall of the reaction kettle.

[0008] As a preferred technical solution of the present utility model: A feeding port is fixedly connected to the reaction kettle. The feeding port is in a cylindrical shape and fixedly connected with a fixed ring inside. A rotating shaft passes through the fixed ring. A number of rotating fan blades are fixedly connected at equal intervals on the rotating shaft. A driven gear is fixedly connected to the lower end of the rotating shaft. There is a rotating gear that is matched with the driven gear. The rotating gear is fixedly connected to the output shaft of a rotating motor. The two gears mesh with each other. The rotating motor is fixedly connected to the inner wall of the reaction kettle. A number of reaction kettle supports are fixedly connected to the lower part of the reaction kettle, and the reaction kettle supports are fixedly connected to the base. An input pipeline is fixedly connected behind the reaction kettle. An input pump is fixedly connected in the middle of the input pipeline. The other end of the input pipeline is fixedly connected to the temporary storage tank cover.

[0009] As a preferred technical solution of the present utility model: The temporary storage tank cover is threadedly connected to the temporary storage tank. The temporary storage tank is fixedly connected to the temporary storage tank base, and the temporary storage tank base is fixedly connected to the base. A temporary storage tank motor is fixedly connected to the temporary storage tank base. The output shaft of the temporary storage tank motor is fixedly connected to a temporary storage tank stirring shaft. A number of temporary storage tank stirring fan blades are fixedly connected at equal intervals on the temporary storage tank stirring shaft. It should be noted that the temporary storage tank stirring fan blades are tangent to the inner wall of the temporary storage tank. A heat - preservation interlayer is fixedly connected outside the temporary storage tank.

[0010] As a preferred technical solution of the present utility model: An output pipeline is fixedly connected to the bottom of the temporary storage tank. An output pump is fixedly connected in the middle of the output pipeline. The other end of the input pipeline is fixedly connected to a twin - screw reactor.

[0011] As a preferred technical solution of the present utility model: Reactor supports are fixedly connected to the lower part of the twin - screw reactor, and the reactor supports are fixedly connected to the base.

[0012] As a preferred technical solution of the present utility model: two spiral reamers arranged vertically are fixedly connected inside the twin-screw reactor. The lower spiral reamer is fixedly connected to the output shaft of the reactor motor. A reactor gear is fixedly connected between the output shaft of the reactor motor and the spiral reamer. There is a reactor driven gear that mates with the reactor gear, and the two gears mesh with each other. The upper spiral reamer is fixedly connected to the reactor driven gear. It should be noted that the spiral reamer has double-layer blades, and rectangular cutting edges are provided on the blades, and the two spiral reamers rotate in opposite directions.

[0013] As a preferred technical solution of the present utility model: a baffle that can block the lower half is fixedly connected to the rear end inside the twin-screw reactor. A number of feeding rod gears are rotatably connected to the rear of the baffle. The feeding rod gears are fixedly connected to the shaft of the lower spiral reamer through connecting rods. The remaining feeding rod gears are arranged downward in a matching manner. The lowermost feeding rod gear is fixedly connected to a spiral feeding rod. An outlet is fixedly connected to the rear end of the twin-screw reactor.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] 1. In this semi-continuous p-aramid polymer preparation device, there are triangular blade-shaped stirring fan blades with an arc, which can generate strong shear force and turbulence during the stirring process and have a crushing effect, so that the materials in the reactor are efficiently stirred and mixed.

[0016] 2. In this semi-continuous p-aramid polymer preparation device, a rotating fan blade is provided at the feeding port, so that materials can be fed at a constant speed, and the materials can be efficiently conveyed from the feeding port to the inside of the reactor, and the blockage phenomenon of the materials during the conveying process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the semi-continuous p-aramid polymer preparation device in the preferred embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the temporary storage tank of the semi-continuous p-aramid polymer preparation device in the preferred embodiment of the present utility model;

[0019] Figure 3 It is a schematic diagram of the twin-screw reactor of the semi-continuous p-aramid polymer preparation device in the preferred embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram of the overall semi-continuous p-aramid polymer preparation device in the preferred embodiment of the present utility model;

[0021] Figure 5This is a sectional view of the feeding port of the batch reactor in the preferred embodiment of the semi - continuous p - aramid polymer preparation equipment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the stirring fan blades in the batch reactor of the semi - continuous p - aramid polymer preparation equipment in the preferred embodiment of the present utility model.

[0023] Illustration: 1. Stirring motor; 2. Base; 3. Stirring shaft; 311. Stirring rod; 312. Stirring fan blade; 4. Reaction kettle; 5. Feeding port; 511. Rotating motor; 512. Rotating gear; 513. Driven gear; 514. Rotating shaft; 515. Rotating fan blade; 516. Fixed ring; 6. Reaction kettle support; 7. Input pipeline; 711. Input pump; 8. Storage tank; 811. Storage tank cover; 812. Storage tank base; 813. Storage tank motor; 814. Storage tank stirring shaft; 815. Storage tank stirring fan blade; 816. Heat - preservation interlayer; 9. Output pipeline; 911. Output pump; 10. Reactor motor; 1001. Reactor gear; 1002. Reactor driven gear; 1003. Screw reamer; 1004. Baffle; 1005; Feeding rod gear; 1006. Screw feeding rod; 11. Twin - screw reactor; 1101. Reactor support; 12. Discharge port. Detailed implementation manners

[0024] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following, in combination with the attached drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present utility model as follows.

[0025] Please refer to Figures 1-6 As shown, the purpose of this embodiment is to provide a semi - continuous p - aramid polymer preparation equipment, including a stirring motor 1, a base 2, a stirring shaft 3, a stirring rod 311, a stirring fan blade 312, a reaction kettle 4, and a feeding port 5. The stirring motor 1 is fixedly connected to the base 2, the output shaft of the stirring motor 1 is fixedly connected to the stirring shaft 3. When the stirring motor 1 works, it will drive the stirring shaft 3 to rotate. A number of stirring rods 311 are fixedly connected around the stirring shaft 3, and the stirring fan blade 312 is fixedly connected to the end of the stirring rod 311;

[0026] It should be noted that the stirring fan blade 312 is in the shape of a curved triangular blade and is tangent to the inner wall of the reaction kettle 4, which can generate strong shear force and turbulence during the stirring process and has a crushing effect.

[0027] A charging port 5 is fixedly connected to the reaction kettle 4. The charging port 5 is cylindrical, and a fixed ring 516 is fixedly connected inside. The fixed ring 516 is used to support the rotating shaft 514. The fixed ring 516 passes through the rotating shaft 514, and the two are rotationally connected through a bearing. Rotating blades 515 are fixedly connected to the rotating shaft 514 at equal intervals. A driven gear 513 is fixedly connected to the lower end of the rotating shaft 514. A rotating gear 512 is provided for the driven gear 513. The rotating gear 512 is fixedly connected to the output shaft of the rotating motor 511. The two gears mesh with each other. The rotating motor 511 is fixedly connected to the inner wall of the reaction kettle 4. When the rotating motor 511 works, the rotating gear 512 drives the driven gear 513 to rotate, thereby driving the rotating blades 515 on the rotating shaft 514 to rotate. In this way, materials can be fed at a constant speed, and the materials can be efficiently conveyed from the feed port to the inside of the reactor. Moreover, due to the continuous rotation of the rotating blades 515, the blockage phenomenon of the materials during the conveying process can be reduced;

[0028] Several reaction kettle supports 6 are fixedly connected below the reaction kettle 4 to support the reaction kettle 4. The reaction kettle supports 6 are fixedly connected to the base 2. An input pipeline 7 is fixedly connected behind the reaction kettle 4. An input pump 711 is fixedly connected to the middle of the input pipeline 7. The other end of the input pipeline is fixedly connected to the temporary storage tank cover 811 to input the reacted materials into the temporary storage tank 8.

[0029] The temporary storage tank cover 811 is threadedly connected to the temporary storage tank 8. The temporary storage tank 8 is fixedly connected to the temporary storage tank base 812. The temporary storage tank base 812 is fixedly connected to the base 2. A temporary storage tank motor 813 is fixedly connected to the temporary storage tank base 812. The output shaft of the temporary storage tank motor 813 is fixedly connected to a temporary storage tank stirring shaft 814. A number of temporary storage tank stirring blades 815 are fixedly connected to the temporary storage tank stirring shaft 814 at equal intervals. When the temporary storage tank motor 813 works, the temporary storage tank stirring shaft 814 will rotate, thereby driving the temporary storage tank stirring blades 815. It should be noted that the temporary storage tank stirring blades 815 are tangent to the inner wall of the temporary storage tank 8. A heat preservation interlayer 816 is fixedly connected outside the temporary storage tank 8 for heat preservation.

[0030] An output pipeline 9 is fixedly connected to the bottom of the temporary storage tank 8. An output pump 911 is fixedly connected to the middle of the output pipeline 9. The other end of the input pipeline is fixedly connected to the twin-screw reactor 11 to output the materials into the twin-screw reactor 11.

[0031] A reactor support 1101 is fixedly connected below the twin-screw reactor 11. The reactor support 1101 is fixedly connected to the base 2 to support the twin-screw reactor 11.

[0032] Two screw conveyors 1003 arranged vertically are fixedly connected inside the twin-screw reactor 11. The lower screw conveyor 1003 is fixedly connected to the output shaft of the reactor motor 10. A reactor gear 1001 is fixedly connected between the output shaft of the reactor motor 10 and the screw conveyor 1003. A reactor driven gear 1002 is provided to match the reactor gear 1001, and the two gears mesh with each other. After the reactor motor 10 is started, the two screw conveyors 1003 will rotate towards each other. The upper screw conveyor 1003 is fixedly connected to the reactor driven gear 1002;

[0033] It should be noted that the screw conveyor 1003 has double-layer blades, and rectangular cutting edges are provided on the blades for cutting materials, and the two screw conveyors 1003 rotate in opposite directions.

[0034] A baffle 1004 that can block the lower part is fixedly connected to the rear end inside the twin-screw reactor 11 for blocking the incompletely reacted materials. A number of feed rod gears 1005 are rotatably connected to the rear of the baffle 1004. The feed rod gears 1005 are fixedly connected to the shaft of the lower screw conveyor 1003 through connecting rods. The remaining feed rod gears 1005 are arranged downward in a matching manner and mesh with each other. The lowermost feed rod gear 1005 is fixedly connected to a screw feeder 1006 for conveying the completely reacted materials. An outlet 12 is fixedly connected to the rear end of the twin-screw reactor 11.

[0035] Experimental principle: Materials are put into the feeding port 5. The feeding port 5 is cylindrical, and a fixed ring 516 is fixedly connected inside. The fixed ring 516 is used to fix the rotating shaft 514. The fixed ring 516 passes through the rotating shaft 514. Rotating blades 515 are fixedly connected to the rotating shaft 514 at equal intervals. A driven gear 513 is fixedly connected to the lower end of the rotating shaft 514. A rotating gear 512 is provided to match the driven gear 513. The rotating gear 512 is fixedly connected to the output shaft of the rotating motor 511. After the rotating motor 511 is started, the materials will be drawn into the reaction kettle 4 through the feeding port 5 by the rotating blades 515. At this time, the stirring motor 1 is started, and the operation of the stirring motor 1 will drive the stirring shaft 3 to rotate. A number of stirring rods 311 are fixedly connected around the stirring shaft 3. Stirring blades 312 are fixedly connected to the ends of the stirring rods 311. The stirring blades 312 are in the shape of a triangular blade with a curvature and are tangent to the inner wall of the reaction kettle 4. They can generate strong shear force and turbulence during the stirring process and have a crushing effect, and can stir the materials evenly and crush the polymers inside.

[0036] After the reaction inside the reactor 4 is completed, the material is transported into the storage tank 8 through the input pump 711 on the input pipeline 7. The storage tank 8 is fixedly connected to the storage tank base 812, and the storage tank base 812 is fixedly connected to the base 2. A storage tank motor 813 is fixedly connected to the storage tank base 812. The output shaft of the storage tank motor 813 is fixedly connected to a storage tank stirring shaft 814. A number of storage tank stirring blades 815 are fixedly connected to the storage tank stirring shaft 814 at equal intervals. When the storage tank motor 813 operates, the storage tank stirring shaft 814 will rotate, thereby driving the storage tank stirring blades 815. The outer layer of the storage tank 8 has a heat preservation interlayer 816 for heat preservation, and the storage tank stirring blades 815 inside the storage tank 8 are used for stirring to prevent the material from caking and agglomerating. After a certain amount of material is stored in the storage tank 8, the material is transported into the twin-screw reactor 11 through the output pump 911 on the output pipeline 9. At this time, the reactor motor 10 starts, driving the spiral reamer 1003 inside the twin-screw reactor 11 to rotate. The spiral reamer 1003 has double-layer blades, and rectangular cutting edges are provided on the blades for cutting the material. The two spiral reamers 1003 rotate in opposite directions. When they rotate synchronously, a closed material channel will be formed between the two screws. These closed channels move along the axial direction with the rotation of the screws, thereby pushing the material from one position to another position, and a complex material flow path will be formed between the two spiral reamers. When the material passes through these paths, it will be subjected to the shearing, stretching and compression effects of the screws, so that the material is fully mixed and plasticized during the transportation process. A baffle 1004 is provided at the rear of the twin-screw reactor 11. The baffle 1004 is used to block the unreacted material, and the fully reacted material will pass through the baffle 1004 and be sent to the discharge port 12 by the spiral feeding rod 1006.

[0037] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes, but as long as the technical content of the present invention is not departed from, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A semi - continuous preparation device for para - aramid polymer, comprising a stirring motor (1), a base (2), a stirring shaft (3), stirring rods (311), stirring fan blades (312), a reaction kettle (4), and a feeding port (5), characterized in that: The stirring motor (1) is fixedly connected to the base (2). The output shaft of the stirring motor (1) is fixedly connected to the stirring shaft (3). A number of stirring rods (311) are fixedly connected around the stirring shaft (3). The end of the stirring rod (311) is fixedly connected to the stirring fan blade (312). The stirring fan blade (312) is in the shape of a triangular blade with a curvature and is tangent to the inner wall of the reaction kettle (4).

2. The semi-continuous para-aramid polymer preparation equipment according to claim 1, characterized in that, A feeding port (5) is fixedly connected to the reaction kettle (4). The feeding port (5) is cylindrical, and a fixed ring (516) is fixedly connected inside. A rotating shaft (514) passes through the fixed ring (516). Rotating fan blades (515) are fixedly connected to the rotating shaft (514) at equal intervals. A driven gear (513) is fixedly connected to the lower end of the rotating shaft (514). A rotating gear (512) is provided for the driven gear (513). The rotating gear (512) is fixedly connected to the output shaft of the rotating motor (511). The two gears mesh with each other. The rotating motor (511) is fixedly connected to the inner wall of the reaction kettle (4). A number of reaction kettle supports (6) are fixedly connected to the lower part of the reaction kettle (4). The reaction kettle supports (6) are fixedly connected to the base (2). An input pipeline (7) is fixedly connected to the back of the reaction kettle (4). An input pump (711) is fixedly connected to the middle of the input pipeline (7). The other end of the input pipeline is fixedly connected to the temporary storage tank cover (811).

3. The semi-continuous para-aramid polymer preparation equipment according to claim 2, characterized in that, The temporary storage tank cover (811) is threadedly connected to the temporary storage tank (8). The temporary storage tank (8) is fixedly connected to the temporary storage tank base (812). The temporary storage tank base (812) is fixedly connected to the base (2). A temporary storage tank motor (813) is fixedly connected to the temporary storage tank base (812). The output shaft of the temporary storage tank motor (813) is fixedly connected to the temporary storage tank stirring shaft (814). A number of temporary storage tank stirring fan blades (815) are fixedly connected to the temporary storage tank stirring shaft (814) at equal intervals. It should be noted that the temporary storage tank stirring fan blades (815) are tangent to the inner wall of the temporary storage tank. A heat preservation interlayer (816) is fixedly connected to the outside of the temporary storage tank (8).

4. The semi-continuous para-aramid polymer preparation equipment according to claim 3, characterized in that, An output pipeline (9) is fixedly connected to the bottom of the temporary storage tank (8). An output pump (911) is fixedly connected to the middle of the output pipeline (9). The other end of the input pipeline is fixedly connected to the twin-screw reactor (11).

5. The semi-continuous para-aramid polymer preparation equipment according to claim 4, characterized in that, A reactor support (1101) is fixedly connected to the lower part of the twin-screw reactor (11). The reactor support (1101) is fixedly connected to the base (2).

6. The semi - continuous para - aramid polymer preparation equipment according to claim 5, characterized in that, Two helical reamers (1003) arranged vertically are fixedly connected inside the twin-screw reactor (11). The lower helical reamer (1003) is fixedly connected to the output shaft of the reactor motor (10). A reactor gear (1001) is fixedly connected between the output shaft of the reactor motor (10) and the helical reamer (1003). A reactor driven gear (1002) is provided to match the reactor gear (1001), and the two gears mesh with each other. The upper helical reamer (1003) is fixedly connected to the reactor driven gear (1002). It should be noted that the helical reamer (1003) has double-layer blades, and rectangular cutting edges are provided on the blades, and the two helical reamers (1003) rotate in opposite directions.

7. The semi-continuous preparation equipment for para-aramid polymer according to claim 5, characterized in that, A baffle (1004) capable of blocking the lower half is fixedly connected to the rear end inside the twin-screw reactor (11). A plurality of feed rod gears (1005) are rotatably connected to the rear of the baffle (1004). The feed rod gears (1005) are fixedly connected to the shaft of the lower helical reamer (1003) through connecting rods. The remaining feed rod gears (1005) are arranged downward in a matching manner. The lowermost feed rod gear (1005) is fixedly connected to a screw feed rod (1006). An outlet (12) is fixedly connected to the rear end of the twin-screw reactor (11).

Images