CN219559622U

CN219559622U - Stirring reaction kettle for poly (p-phenylene benzobisoxazole) -polyphosphoric acid system

Info

Publication number: CN219559622U
Application number: CN202321883031.7U
Authority: CN
Inventors: 王叔超; 王凤德; 田远; 李先红; 王峰; 刘雄
Original assignee: Chengdu Xinchen New Material Technology Co ltd
Current assignee: Chengdu Xinchen New Material Technology Co ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2023-08-22
Anticipated expiration: 2033-07-18

Abstract

The utility model discloses a stirring reaction kettle for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system, which relates to the technical field of stirring reaction kettles and comprises a kettle body, wherein a feed inlet and a driving motor are arranged on the kettle body, the driving motor is connected with a stirring shaft, the stirring shaft stretches into the kettle body and is connected with a stirring frame, stirring blades are arranged on the stirring frame, a flow guide baffle plate is arranged in the kettle body, a flowing gap is formed between the flow guide baffle plate and the outer side of the stirring frame, and a discharge hole is formed in the lower end of the kettle body. The driving motor drives the stirring frame to rotate, materials in the kettle flow in a large range, and meanwhile, the fluid nearby the stirring blade forms local turbulence under the shearing action, so that the molecular diffusion contact is enhanced, and the polymerization efficiency is improved; under the action of the stirring frame and the flow guide baffle, the material of the kettle body closely attached to the inner wall of the kettle body is guided to flow along the flow guide baffle, so that the stable centrifugal movement of the material is destroyed, and the molecular mixing of the fluid at the kettle wall is enhanced. The utility model can overcome the pole climbing effect of materials, so that the stirring effect is better.

Description

Stirring reaction kettle for poly (p-phenylene benzobisoxazole) -polyphosphoric acid system

Technical Field

The utility model relates to the technical field of stirring reaction kettles, and particularly discloses a stirring reaction kettle for a poly (p-phenylene benzobisoxazole) -polyphosphoric acid system.

Background

Poly (p-Phenylene Benzobisoxazole) (PBO), a reinforcing material for composite materials developed for developing aerospace industry in the United states in the 80 th century, is one of the most promising members of the polyamide family containing heterocyclic aromatics, and is known as 21 st century super fiber. The PBO fiber has the excellent performances of high strength, high modulus, high temperature resistance, chemical corrosion resistance and the like, so that the PBO fiber has important application value and wide prospect in the civil and military fields.

The main process route adopted by the PBO fiber at present is terephthalic acid method: in polyphosphoric acid (PPA) solvent, the synthesis method is mainly that monomer 4, 6-diamino resorcinol and terephthalic acid are polymerized, the reaction finally forms a PBO-PPA polymer system with liquid crystal state, and PBO fiber is prepared by the processes of dry-jet wet spinning, repeated water washing, drying and the like. Wherein the PBO prepolymerization reaction is carried out in a batch reactor, the dynamic viscosity of the system is continuously increased in the polymerization process until the dynamic viscosity exceeds 500 ten thousand cp, and the polymerization process of the high viscosity system has higher requirements on a stirrer of the reactor. When the PBO-PPA polymerization reaction system is applied to an anchor, frame and ribbon type stirrer commonly applied in the polymer industry, the dynamic viscosity is even higher by several orders of magnitude than that of a common polymer polymerization system, the influence of a serious pole climbing effect can occur during the polymerization reaction, the quality of the PBO polymer is not easy to control, and the PBO fiber with high strength is difficult to prepare. The utility model discloses a stirring reaction kettle which is more suitable for a PBO-PPA system and is developed by improving a frame stirrer.

Disclosure of Invention

The utility model aims to solve the problem that a stirring reaction kettle in the prior art is subjected to a pole climbing effect when being used for a PBO-PPA system, and provides the stirring reaction kettle for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system, wherein a driving motor drives a stirring frame to rotate, so that materials in the kettle flow in a large range in a total way, and meanwhile, fluid nearby a stirring blade forms local turbulence under the shearing action, so that the efficient mixing of the materials is accelerated, the molecular diffusion contact is enhanced, and the efficiency of polymerization reaction is improved; under the action of the stirring frame and the flow guide baffle, the material of the kettle body closely attached to the inner wall of the kettle body is guided to flow along the flow guide baffle, so that the stable centrifugal movement of the material is destroyed, and the molecular mixing of the fluid at the kettle wall is enhanced. The utility model can overcome the pole climbing effect of materials, has better stirring effect, is favorable for greatly improving the consistency of the PBO polymer, and is favorable for realizing the spinning process stability of the PBO fiber.

The utility model aims at realizing the following technical scheme:

a stirring reation kettle for polyparaphenylene benzobisoxazole-polyphosphoric acid system, including the cauldron body, cauldron body upper end is provided with feed inlet and driving motor, driving motor passes through the shaft coupling and links to each other with the (mixing) shaft, the (mixing) shaft stretches into the internal stirring frame that links to each other of cauldron, be provided with stirring vane on the stirring frame, the internal guide baffle that still is provided with of cauldron, form the flow clearance between guide baffle and the stirring frame outside, cauldron body lower extreme is provided with the discharge gate.

Preferably, the stirring frame is a squirrel cage stirring frame.

Preferably, the stirring blade is of a frame structure.

Preferably, the stirring blade is arranged at the middle lower section of the stirring frame.

Preferably, a plurality of the flow guide baffles are provided.

Preferably, the plurality of flow guide baffles are uniformly arranged at the lower end of the inner wall of the kettle body.

Preferably, the flow gap is 25-50mm.

Preferably, the kettle body is provided with a sight glass.

Preferably, a single screw extruder is arranged at the discharge port.

Preferably, a heat exchange jacket is further arranged outside the kettle body.

The beneficial effects of this technical scheme are as follows:

1. according to the stirring reaction kettle for the poly-p-phenylene benzobisoxazole-polyphosphoric acid system, provided by the utility model, the driving motor drives the stirring frame to rotate, materials in the kettle flow in a large range in a bulk way, meanwhile, fluid nearby the stirring blade forms local turbulence under the shearing action, so that the efficient mixing of the materials is accelerated, the molecular diffusion contact is enhanced, and the polymerization efficiency is improved; under the action of the stirring frame and the flow guide baffle, the material of the kettle body closely attached to the inner wall of the kettle body is guided to flow along the flow guide baffle, so that the stable centrifugal movement of the material is destroyed, and the molecular mixing of the fluid at the kettle wall is enhanced. The application of the utility model can overcome the pole climbing effect of materials, so that the stirring effect is better, the consistency of the PBO polymer is greatly improved, and the spinning process stability of the PBO fiber is realized.

2. The stirring reaction kettle for the poly-p-phenylene benzobisoxazole-polyphosphoric acid system provided by the utility model further overcomes the pole climbing effect in the material stirring process due to the arrangement of the squirrel-cage stirring frame and the frame structure.

3. The stirring reaction kettle for the poly (p-phenylene benzobisoxazole) -polyphosphoric acid system provided by the utility model has a flow gap of 25-50mm, so that the materials in the kettle can flow in a whole in a maximum range.

4. According to the stirring reaction kettle for the poly-p-phenylene benzobisoxazole-polyphosphoric acid system, provided by the utility model, the setting of the sight glass is convenient for checking the material condition of the kettle body, the single-screw extruder enables the material to be discharged more smoothly, and the setting of the heat exchange jacket meets the temperature of material reaction.

5. The stirring reaction kettle for the poly (p-phenylene benzobisoxazole) -polyphosphoric acid system provided by the utility model can be used for the poly (p-phenylene benzobisoxazole) -polyphosphoric acid system, and can be suitable for a high-viscosity system or a non-Newtonian fluid system.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view at A-A in FIG. 1;

wherein: 1. a kettle body; 2. a heat exchange jacket; 3. a stirring frame; 4. stirring blades; 5. a flow guiding baffle; 6. a feed port; 7. a viewing mirror; 8. a single screw extruder; 9. a driving motor; 10. a discharge port; 11. a flow gap.

Detailed Description

The present utility model will be described in further detail with reference to examples, but embodiments of the present utility model are not limited thereto.

It is noted that when an element is referred to as being "mounted," "secured," or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should be noted that, in the embodiments of the present utility model, terms such as left, right, up, and down are merely relative concepts or references to normal use states of the product, and should not be construed as limiting.

Example 1

As shown in fig. 1 and 2, a stirring reaction kettle for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system comprises a kettle body 1, wherein a feed inlet 6 and a driving motor 9 are arranged at the upper end of the kettle body 1, the driving motor 9 is connected with a stirring shaft through a coupler, the stirring shaft stretches into the kettle body 1 and is connected with a stirring frame 3, stirring blades 4 are arranged on the stirring frame 3, a flow guide baffle 5 is further arranged in the kettle body 1, a flow gap 11 is formed between the flow guide baffle 5 and the outer side of the stirring frame 3, and a discharge outlet 10 is arranged at the lower end of the kettle body 1. The stirring frame 3 is driven by the driving motor 9 to rotate, materials in the kettle flow in a large range in a bulk way, meanwhile, the fluid nearby the stirring blade 4 forms local turbulence under the shearing action, so that the efficient mixing of the materials is accelerated, the molecular diffusion contact is enhanced, and the polymerization efficiency is improved; under the action of the stirring frame 3 and the flow guide baffle 5, the material of the kettle body 1 is guided to flow along the flow guide baffle 5, so that the stable centrifugal movement of the material is destroyed, and the molecular mixing of the fluid at the kettle wall is enhanced.

Example 2

The difference between this embodiment and embodiment 1 is that: the stirring frame 3 is a squirrel-cage stirring frame.

Wherein, stirring vane 4 is frame structure. The arrangement of the squirrel-cage stirring frame and the frame structure further overcomes the pole climbing effect in the process of stirring materials.

Wherein the stirring blade 4 is arranged at the middle lower section of the stirring frame 3.

Wherein, the flow guiding baffle 5 is provided with a plurality of flow guiding baffles.

Wherein, a plurality of baffle 5 evenly set up in the inner wall lower extreme of cauldron body 1.

Wherein the flow gap 11 is 25-50mm. The flow gap 11 is 25-50mm, so that the material in the kettle body 1 flows in the whole range of the maximum.

Wherein, be provided with sight glass 7 on the cauldron body 1.

Wherein, a single screw extruder 8 is arranged at the discharge port 10.

Wherein, still be provided with heat exchange jacket 2 outside the cauldron body 1. The setting of sight glass 7 conveniently looks over the material condition of the cauldron body 1, and the setting of single screw extruder 8 makes the material ejection of compact smoother, and the setting of heat transfer jacket 2 satisfies the temperature of material reaction.

The stirring reaction kettle not only can be used for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system, but also can be used for a high-viscosity system or a non-Newtonian fluid system.

When the device is used, materials enter the kettle body 1 through the feed port 6, heat exchange medium meeting the material reaction requirement is introduced into the heat exchange jacket 2, the driving motor 9 is started, the driving motor 9 rotates to drive the stirring frame 3 of the kettle body 1 and the stirring blades 4 arranged on the stirring frame 3 to stir, and after the stirring reaction of the kettle body 1 is completed, the reacted materials are discharged out of the kettle body 1 from the discharge port 10 through the single screw extruder 8.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.

Claims

1. A stirring reaction kettle for a poly (p-phenylene benzobisoxazole) -polyphosphoric acid system comprises a kettle body (1), wherein a feed inlet (6) and a driving motor (9) are arranged at the upper end of the kettle body (1), and the stirring reaction kettle is characterized in that: the stirring device is characterized in that the driving motor (9) is connected with the stirring shaft through a shaft coupling, the stirring shaft stretches into the kettle body (1) and is connected with the stirring frame (3), stirring blades (4) are arranged on the stirring frame (3), a flow guide baffle (5) is further arranged inside the kettle body (1), a flowing gap (11) is formed between the flow guide baffle (5) and the outer side of the stirring frame (3), and a discharge hole (10) is formed in the lower end of the kettle body (1).

2. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the stirring frame (3) is a squirrel cage stirring frame.

3. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the stirring blade (4) is of a frame structure.

4. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the stirring blade (4) is arranged at the middle lower section of the stirring frame (3).

5. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the flow guide baffle (5) is provided with a plurality of flow guide baffles.

6. The stirred tank reactor for a poly (p-phenylene benzobisoxazole) -polyphosphoric acid system, as recited in claim 5, wherein: the plurality of guide baffles (5) are uniformly arranged at the lower end of the inner wall of the kettle body (1).

7. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the flow gap (11) is 25-50mm.

8. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the kettle body (1) is provided with a sight glass (7).

9. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: a single screw extruder (8) is arranged at the discharge port (10).

10. The stirred tank reactor for a poly-p-phenylene benzobisoxazole-polyphosphoric acid system as in claim 1, wherein: the kettle body (1) is also provided with a heat exchange jacket (2).