CN219559622U - Stirred reactor for poly(p-phenylenebenzobisoxazole-polyphosphoric acid) system - Google Patents

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

Stirred reactor for poly(p-phenylenebenzobisoxazole-polyphosphoric acid) system

technical field

The utility model relates to the technical field of stirred reactors, in particular disclosing a stirred reactor for poly-p-phenylenebenzobisoxazole-polyphosphoric acid system.

Background technique

Poly-p-phenylene benzobisoxazole fiber (PBO) is a reinforcing material for composite materials developed by the United States in the 1980s for the development of the aerospace industry. It is the most promising polyamide family containing heterocyclic aromatics. A member, known as the 21st century super fiber. The high strength, high modulus, high temperature resistance, chemical corrosion resistance and other excellent properties of PBO fiber make it have important application value and broad prospects in civil and military fields.

At present, the main process route used by PBO fiber is the terephthalic acid method: in the polyphosphoric acid (PPA) solvent, the synthesis is mainly carried out by the polymerization reaction of the monomer 4,6-diaminoresorcinol and terephthalic acid. method, the reaction finally forms a PBO-PPA polymer system with a liquid crystal state, and the PBO fiber is prepared through a dry-jet wet spinning process, repeated washing, and drying. Among them, the PBO pre-polymerization reaction is carried out in a batch reactor, and the dynamic viscosity of the system continues to increase during the polymerization process until it exceeds 5 million cp. The polymerization reaction process of such a high-viscosity system puts forward higher requirements for the reactor agitator. The anchor type, frame type and ribbon type agitator commonly used in the polymer industry, when applied to the PBO-PPA polymerization reaction system, the dynamic viscosity of the PBO-PPA system is even several orders of magnitude higher than that of the general polymer polymerization system , There will be a serious climbing effect during the polymerization reaction, the quality of PBO polymer is not easy to control, and it is difficult to prepare high-strength PBO fibers. The utility model patent improves the frame type agitator and develops a stirring reaction kettle more suitable for PBO-PPA system.

Utility model content

The utility model aims to solve the problem that the stirred reactor in the prior art will be subjected to the rod-climbing effect when it is used in the PBO-PPA system, and provides a stirred reactor for the poly-p-phenylenebenzobisoxazole-polyphosphoric acid system , the driving motor drives the stirring frame to rotate, so that the material in the kettle can flow in a large range, and at the same time, the fluid near the stirring blade forms a local turbulent flow under the action of shearing, which speeds up the efficient mixing of materials, strengthens the molecular diffusion contact, and improves the efficiency of the polymerization reaction; the kettle body Under the action of the stirring frame and the diversion baffle, the material close to the inner wall of the kettle is guided to flow along the diversion baffle, destroying its stable centrifugal motion and strengthening the molecular mixing of the fluid at the kettle wall. The utility model can overcome the pole-climbing effect of the material, so that the stirring effect is better, and the consistency of the PBO polymer is greatly improved, and then the stability of the spinning process of the PBO fiber is realized.

The purpose of this utility model is achieved by the following technical solutions:

A stirring reaction kettle for poly-p-phenylenebenzobisoxazole-polyphosphoric acid system, including a kettle body, the upper end of the kettle body is provided with a feeding port and a driving motor, and the driving motor is connected to the stirring shaft through a coupling , the stirring shaft extends into the kettle body and connects with the stirring frame, the stirring frame is provided with stirring blades, and the inside of the kettle body is also provided with a diversion baffle, forming a gap between the diversion baffle and the outside of the stirring frame Flow gap, the lower end of the kettle body is provided with a discharge port.

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

Preferably, the stirring blade is a frame structure.

Preferably, the stirring blades are arranged in the lower part of the stirring frame.

Preferably, there are multiple guide baffles.

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

Preferably, the flow gap is 25-50mm.

Preferably, a sight glass is arranged on the kettle body.

Preferably, a single-screw extruder is provided at the outlet.

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

The beneficial effects of this technical solution are as follows:

1. The stirring reaction kettle for poly(p-phenylenebenzobisoxazole-polyphosphoric acid system) provided by the utility model, the driving motor drives the stirring frame to rotate, and the materials in the kettle flow in a large range as a whole, and at the same time, the fluid near the stirring blade is shearing The local turbulent flow is formed under the action of cutting, the efficient mixing of materials is accelerated, the molecular diffusion contact is strengthened, and the efficiency of polymerization reaction is improved; The flow of the flow baffle disrupts its stable centrifugal motion and strengthens the molecular mixing of the fluid at the wall of the kettle. The application of the utility model can overcome the pole-climbing effect of the material, so that the stirring effect is better, which is beneficial to greatly improving the consistency of the PBO polymer, and then is beneficial to realizing the stability of the spinning process of the PBO fiber.

2. The stirred reactor for poly(p-phenylenebenzobisoxazole-polyphosphoric acid) system provided by the utility model, the setting of the squirrel-cage stirring frame and the frame structure further overcomes the pole-climbing effect in the material stirring process .

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

4. The agitated reactor for the poly(p-phenylenebenzobisoxazole-polyphosphoric acid system) provided by the utility model, the setting of the sight glass is convenient to check the material situation of the kettle body, and the setting of the single-screw extruder makes the material go out The material is smoother, and the setting of the heat exchange jacket meets the temperature of the material reaction.

5. The stirred reactor for poly(p-phenylenebenzobisoxazole-polyphosphoric acid) system provided by the utility model, this stirred reactor can not only be used for poly(p-phenylenebenzobisoxazole-polyphosphoric acid) It can also be used in high-viscosity systems or non-Newtonian fluid systems.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the sectional view of A-A place in Fig. 1;

Among them: 1. Kettle body; 2. Heat exchange jacket; 3. Stirring frame; 4. Stirring blade; 5. Guide baffle; 6. Feeding port; 7. Sight glass; , Drive motor; 10, discharge port; 11, flow gap.

Detailed ways

The utility model will be described in further detail below in conjunction with the examples, but the implementation of the utility model is not limited thereto.

It should be noted that, when an element is referred to as being “mounted on”, “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element at the same time. 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 also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present utility model are only relative concepts or refer to the normal use state of the product, and should not be regarded as restrictive of.

Example 1

As shown in Figure 1 and Figure 2, the stirred reactor for poly-p-phenylenebenzobisoxazole-polyphosphoric acid system includes a kettle body 1, and the upper end of the kettle body 1 is provided with a feeding port 6 and a drive motor 9 , the drive motor 9 is connected to the stirring shaft through a coupling, and the stirring shaft extends into the still body 1 and is connected to the stirring frame 3. The stirring frame 3 is provided with stirring blades 4, and the inside of the kettle body 1 is also A flow guide baffle 5 is provided, and a flow gap 11 is formed between the flow guide baffle 5 and the outside of the stirring frame 3 , and a discharge port 10 is provided at the lower end of the kettle body 1 . The driving motor 9 drives the stirring frame 3 to rotate, and the materials in the kettle flow in a large area. At the same time, the fluid near the stirring blade 4 forms a local turbulent flow under the action of shearing, which speeds up the efficient mixing of materials, strengthens the molecular diffusion contact, and improves the efficiency of the polymerization reaction; Under the action of the stirring frame 3 and the diversion baffle 5, the material in the body 1 guides the material close to the inner wall of the kettle body 1 to flow along the diversion baffle 5, destroying its stable centrifugal motion and strengthening the molecular mixing of the fluid at the kettle wall .

Example 2

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

Wherein, the stirring blade 4 is a frame structure. The setting of the squirrel-cage mixing frame and the frame structure further overcomes the pole-climbing effect during the material mixing process.

Wherein, the stirring blade 4 is arranged in the lower part of the stirring frame 3 .

Wherein, there are multiple guide baffles 5 .

Wherein, a plurality of guide baffles 5 are evenly arranged on the lower end of the inner wall of the kettle body 1 .

Wherein, the flow gap 11 is 25-50 mm. The flow gap 11 is 25-50 mm, so that the materials in the still body 1 can flow as a whole in the largest range.

Wherein, the kettle body 1 is provided with a viewing mirror 7 .

Wherein, the discharge port 10 is provided with a single-screw extruder 8 .

Wherein, a heat exchange jacket 2 is provided outside the kettle body 1 . The setting of sight glass 7 is convenient to check the material condition of kettle body 1, the setting of single screw extruder 8 makes material discharge more smoothly, and the setting of heat exchange jacket 2 satisfies the temperature of material reaction.

This stirred reactor can not only be used for poly(p-phenylene benzobisoxazole-polyphosphoric acid system), but also suitable for high viscosity system or non-Newtonian fluid system.

When the device is in use, the material enters the interior of the kettle body 1 through the feeding port 6, and the heat exchange medium that meets the requirements of the material reaction is introduced into the heat exchange jacket 2, and the driving motor 9 is started, and the driving motor 9 rotates to drive the stirring frame 3 of the kettle body 1 Stir with the stirring blade 4 arranged on the stirring frame 3. After the material is stirred and reacted in the kettle body 1, the reacted material is discharged from the kettle body 1 through the single-screw extruder 8 from the discharge port 10.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification or equivalent change made to the above embodiments according to the technical essence of the utility model falls within the scope of the present utility model. Within the protection scope of the present utility model.

Claims (10)

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).