Polyimide synthesizer

Abstract

The utility model provides a polyimide synthesis device, which comprises a reaction kettle, a temperature sensor and a temperature sensor, a solid feeding hole and a liquid feeding hole are formed in the top of the reaction kettle; the solid feeding hole is connected with a solid raw material conveying mechanism through a solid feeding pipeline; the liquid feeding hole is connected with a liquid raw material conveying mechanism through a liquid feeding pipeline; a weighing module is arranged on the solid feeding pipeline and is used for weighing the weight of solid raw materials entering the reaction kettle; a liquid flow meter is arranged on the liquid feeding pipeline and is used for measuring the mass of a liquid raw material entering the reaction kettle. According to the reaction kettle, the viscometer and the temperature sensor are arranged in the reaction kettle chamber, so that materials are reasonably added, the reaction controllability is improved, and the stability and the consistency of polyimide products are finally improved. In addition, the labor cost and the operation error rate are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of high polymer material synthesis and processing technology, specifically relates to a kind of polyimide synthesis device. BACKGROUND

[0002] As a kind of high-performance polymer material, polyimide shows a wide application prospect in multiple high-tech fields such as aerospace, electronic information, automobile manufacturing and biomedical due to its excellent heat resistance, excellent mechanical properties, good chemical stability and low dielectric constant etc. characteristics. Especially in the field of aerospace, polyimide material is used to manufacture high-performance composite material parts, which significantly improves the structural strength and lightweight level of aircraft;And in the electronic industry, polyimide becomes an ideal choice for manufacturing flexible circuit board, insulating layer and protective layer etc. key components due to its excellent insulation performance and processing performance.

[0003] However, although polyimide material has many advantages, its traditional synthesis process faces technical bottleneck, which limits the further improvement of product quality and optimization of production efficiency. The following are the main problems existing in the current polyimide synthesis device:

[0004] In the traditional polyimide synthesis process, the addition of materials often depends on manual operation or simple automatic device, which is difficult to realize accurate measurement and timely addition. This leads to the difficulty in stable control of the proportion of each component in the reaction system, which further affects the uniformity of polymerization reaction and the performance consistency of the final product. INVENTION CONTENTS

[0005] The utility model provides a kind of polyimide synthesis device to solve the defect that the addition of materials in the prior art polyimide synthesis device is difficult to realize accurate measurement and timely addition.

[0006] A kind of polyimide synthesis device, comprising: reaction kettle, viscosity meter and temperature sensor are arranged in the reaction kettle;

[0007] Solid feeding port and liquid feeding port are arranged at the top of the reaction kettle;

[0008] The solid feeding port is connected with solid raw material conveying mechanism by solid feeding pipeline;The liquid feeding port is connected with liquid raw material conveying mechanism by liquid feeding pipeline;

[0009] Weighing module is arranged on the solid feeding pipeline, and the weighing module is used to weigh the weight of solid raw material into the reaction kettle;

[0010] Liquid flowmeter is arranged on the liquid feeding pipeline, and the liquid flowmeter is used to measure the mass of liquid raw material into the reaction kettle.

[0011] Further, the polyimide synthesis device as described above, the weighing module comprises: a weighing platform, a weighing sensor, a support structure;

[0012] The weighing platform is used for placing solid raw materials to be weighed; the weighing sensor is arranged below the weighing platform or directly or indirectly connected with the weighing platform, used for converting the weight of the solid on the weighing platform into an electrical signal; and the support structure is used for supporting the weighing platform and the weighing sensor.

[0013] Further, the polyimide synthesis device as described above, further comprises a reflux condensing device, which is communicated with the inside of the reaction kettle through a reflux exhaust pipe.

[0014] Further, the polyimide synthesis device as described above, the reflux condensing device comprises: a condenser, a liquid collecting bottle;

[0015] The top of the condenser is provided with an exhaust port, and the bottom thereof is communicated with the liquid collecting bottle, and the bottom of the liquid collecting bottle is provided with a liquid discharge valve.

[0016] Further, the polyimide synthesis device as described above, the condenser comprises a shell, a plurality of circular cavities are arranged in the shell, the plurality of circular cavities are communicated in sequence in the vertical direction, the uppermost circular cavity of the plurality of circular cavities is communicated with the exhaust port, and the lowermost circular cavity of the plurality of circular cavities is communicated with the liquid collecting bottle.

[0017] Further, the polyimide synthesis device as described above, the liquid collecting bottle is made of transparent material.

[0018] Further, the polyimide synthesis device as described above, the solid raw material conveying mechanism comprises: a screw feeder and a solid raw material bin;

[0019] The screw feeder comprises a tubular shell, a spiral blade is arranged in the tubular shell, and the spiral blade pushes the solid raw material into the solid feeding pipe along the length direction of the tubular shell through rotation;

[0020] The bottom or side of the solid raw material bin is communicated with the inlet of the screw feeder, so as to supply the stored solid raw material to the screw feeder.

[0021] Further, the polyimide synthesis device as described above, the liquid raw material conveying mechanism comprises: a liquid raw material bin and a centrifugal pump;

[0022] The liquid raw material bin is used for storing the liquid raw material to be conveyed, and has one or more feeding ports for adding liquid raw material into the bin and a discharging port for discharging the liquid raw material;

[0023] The centrifugal pump is connected with the discharge port of the liquid raw material bin, and is used for pumping the liquid raw material out of the liquid raw material bin and into the liquid feeding pipeline.

[0024] Further, the polyimide synthesis device as described above is further provided with a stirring device in the reaction kettle, and a variable frequency motor is arranged at the top of the stirring rod of the stirring device.

[0025] The polyimide synthesis device provided by the utility model has the advantages that the viscosity meter and the temperature sensor are arranged in the reaction kettle chamber, so that the reaction conditions in the reaction kettle can be accurately controlled through the data collected by the two, the material is reasonably added, the controllability of the reaction is improved, and the stability and consistency of the polyimide product are finally improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The polyimide synthesis device provided by the utility model is shown in the structure diagram;

[0027] Reference signs:

[0028] 1-reaction kettle; 2-viscosity meter; 3-temperature sensor; 4-solid raw material conveying mechanism; 5-liquid raw material conveying mechanism; 6-weighing module; 7-discharging valve; 8-reflux condensing device; 9-reflux exhaust pipe;

[0029] 10-variable frequency motor; 11-solid feeding port; 12-liquid feeding port; 13-gas inlet; 14-discharging valve;

[0030] 41-spiral feeder; 42-solid raw material bin;

[0031] 51-liquid raw material bin; 52-centrifugal pump;

[0032] 81-exhaust port; 82-condenser; 83-liquid collecting bottle; 84-liquid discharge valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0034] Figure 1 The polyimide synthesis device provided by the utility model is shown in the structure diagram, Figure 1As shown, the device comprises a reaction kettle 1, in which a viscometer 2 and a temperature sensor 3 are arranged; a solid feeding port 11 and a liquid feeding port 12 are arranged at the top of the reaction kettle 1; the solid feeding port 11 is connected with a solid raw material conveying mechanism 4 through a solid feeding pipeline; the liquid feeding port 12 is connected with a liquid raw material conveying mechanism 5 through a liquid feeding pipeline; a weighing module 6 is arranged on the solid feeding pipeline, which is used to weigh the solid raw material entering the reaction kettle 1; a liquid flowmeter (not shown in the figure) is arranged on the liquid feeding pipeline, which is used to measure the mass of the liquid raw material entering the reaction kettle 1. A stirring device is also arranged in the reaction kettle 1, the stirring rod of which is provided with a variable frequency motor 10 at the top, and a discharge valve 14 at the bottom.

[0035] Specifically, the solid raw material conveying mechanism 4 continuously or intermittently conveys the solid raw material to the solid feeding pipeline, and finally into the reaction kettle 1 through the solid feeding port 11. At the same time, the weighing module 6 on the solid feeding pipeline accurately records the weight of the solid raw material entering the reaction kettle, to ensure the accuracy of the feeding amount. The liquid raw material conveying mechanism 5 is responsible for feeding the liquid raw material into the liquid feeding pipeline as needed, and finally into the reaction kettle 1 through the liquid feeding port 12. The liquid flowmeter can accurately measure and record the volume or mass of the liquid raw material entering the reaction kettle 1. The solid raw material and the liquid raw material in the reaction kettle 1 react under the stirring of the stirring device. During the reaction, the viscometer 2 arranged in the reaction kettle 1 detects the viscosity change of the reaction system in real time, and sends the measured data to the control system; at the same time, the temperature sensor 3 continuously monitors the reaction temperature and also sends the measured data to the control system, to ensure that the reaction is carried out within the predetermined temperature range. Since viscosity is an important physical parameter in the synthesis of polyimide, it reflects the degree of polymer chain growth and the fluidity of the system, and is crucial for controlling product quality, therefore, the online oscillation viscometer is adopted in the present application to measure the viscosity of the reaction system, which can effectively improve the measurement accuracy. The control system analyzes the collected viscosity data and temperature data, and determines the mass of the solid raw material required to be fed into the reaction kettle 1 according to the analysis results; and the mass of the liquid to be fed into the reaction kettle through the liquid flowmeter. If the viscosity deviates from the target range, the control system can automatically adjust the conveying rate of the solid or liquid raw material, or adjust the reaction temperature, to maintain the optimal polymerization conditions. Thus, through closed-loop control, fine management of the reaction process is realized, and the consistency of product quality and production efficiency are improved.

[0036] The polyimide synthesis device provided by the utility model, through setting the viscometer and the temperature sensor in the reaction kettle chamber, the reaction conditions inside the reaction kettle can be accurately controlled through the data collected by the two, the material is reasonably added, the controllability of the reaction is improved, and finally the stability and consistency of the polyimide product are improved.

[0037] Further, the weighing module 6 as described above comprises: a weighing platform for placing the solid raw material to be weighed, the platform having sufficient strength and stability to support the solid raw material; a weighing sensor arranged below the weighing platform or directly or indirectly connected with the weighing platform, for converting the weight of the solid on the weighing platform into an electrical signal; and a support structure for stably supporting the weighing platform and the weighing sensor to ensure stability and accuracy during the weighing process.

[0038] Further, the device provided by the application further comprises a reflux condensing device 8 which is in communication with the inside of the reaction kettle 1 through a reflux exhaust pipe 9.

[0039] Specifically, the device provided by the application is particularly suitable for the synthesis of products requiring imination reaction. To ensure efficient and safe reaction, the device is equipped with a reflux condensing device. When synthesizing products requiring imination, a water-carrying agent is pre-added to the reflux condensing device. The water-carrying agent has a high water-carrying capacity and can timely carry out the water generated in the imination reaction from the reaction kettle, thereby promoting the reaction to proceed to the right, improving the purity and yield of the product. After condensation in the condensing system, the water-carrying agent and water are refluxed into the reflux condensing device, and at the same time, due to the difference in density, the water naturally sinks to the lower layer of the reflux condensing device, while the water-carrying agent is refluxed into the reaction kettle for continuous use, thereby realizing the maximum utilization of resources. When synthesizing products that do not require imination, the reflux condensing device can be used as an exhaust passage. This design ensures that the gas generated during the reaction can be timely discharged, avoiding adverse effects on the reaction, and at the same time improving the versatility and flexibility of the device.

[0040] The polyimide synthesis device provided by the utility model can monitor the reaction state in real time, accurately control the material feeding, and efficiently remove the water generated in the reaction through the reflux condensing device, further improving the synthesis quality and production efficiency of polyimide.

[0041] Further, the reflux condensing device 8 as described above comprises: a condenser 82, and a liquid collecting bottle 83; the top of the condenser 82 is provided with an exhaust port 81, the bottom thereof is in communication with the liquid collecting bottle 83, and the bottom of the liquid collecting bottle 83 is provided with a liquid discharge valve 84.

[0042] Specifically, the water-carrying agent and water are condensed in condenser 82 and then flow back to the collection bottle 83. The water naturally sinks to the lower layer of the collection bottle 83, while the water-carrying agent naturally sinks to the upper layer and eventually flows back into the reactor. Furthermore, to allow operators to visually observe the water collection process, the collection bottle 83 is made of transparent material, making it visible. Simultaneously, a liquid level sensor is installed inside the collection bottle 83 to monitor the water level in real time. Thus, the combination of the visible collection bottle and the liquid level sensor enables precise monitoring and control of the reaction process, improving reaction safety.

[0043] The reflux condenser provided in this application can be used for both moisture collection and exhaust channels, meeting the needs of different reaction types and thus ensuring the efficient, safe, and flexible conduct of chemical reactions.

[0044] Furthermore, the condenser 82 described above includes a housing, within which a plurality of circular cavities are provided. These circular cavities are connected sequentially in the vertical direction. The uppermost circular cavity is connected to the exhaust port 81, and the lowermost circular cavity is connected to the liquid collection bottle 83.

[0045] The polyimide synthesis apparatus provided in this application features a condenser with several vertically connected circular cavities, which increases the condensation area and facilitates heat transfer and the condensation process. This design improves condensation efficiency. Furthermore, the vertical arrangement of multiple circular cavities saves space and facilitates installation and maintenance. This compact design is particularly suitable for space-constrained applications, improving space utilization. Moreover, the lowest circular cavity connects to a collection bottle, ensuring effective collection of condensate.

[0046] Further, the solid raw material conveying mechanism 4 described above includes: a screw feeder 41 and a solid raw material silo 42; the screw feeder includes: a tubular shell, inside which helical blades are disposed, the helical blades propelling the solid raw material along the length of the tubular shell into the solid feed pipe by rotation; the bottom or side of the solid raw material silo is connected to the inlet of the screw feeder so as to supply the stored solid raw material to the screw feeder. The liquid raw material conveying mechanism 5 described above includes: a liquid raw material silo 51 and a centrifugal pump 52; the liquid raw material silo 51 is used to store the liquid raw material to be conveyed, the liquid raw material silo 51 has one or more inlets for adding liquid raw material into the silo, and an outlet for discharging liquid raw material; the centrifugal pump 52 is connected to the outlet of the liquid raw material silo 51 for drawing liquid raw material from the liquid raw material silo 51 and pumping it into the liquid feed pipe.

[0047] The polyimide synthesis apparatus provided by this invention involves starting the reactor, adding initial materials, and activating the screw feeder and centrifugal pump, with materials added according to a pre-set program. During the reaction, an online oscillating viscometer and temperature sensor transmit data to the control system in real time. The control system automatically adjusts the operating parameters of the screw feeder and centrifugal pump based on preset viscosity, temperature ranges, and reaction steps. Furthermore, during the imidization reaction, a reflux dehydration device is activated, and a level sensor continuously monitors the water level in the collection tank to determine the degree of imidization.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A polyimide synthesis apparatus, characterized in that, include: A reaction vessel (1) is provided with a viscometer (2) and a temperature sensor (3); A solid feed inlet (11) and a liquid feed inlet (12) are provided at the top of the reactor (1); The solid feed inlet (11) is connected to a solid raw material conveying mechanism (4) via a solid feed pipe; the liquid feed inlet (12) is connected to a liquid raw material conveying mechanism (5) via a liquid feed pipe; A weighing module (6) is provided on the solid feed pipe. The weighing module (6) is used to weigh the weight of the solid raw materials entering the reactor (1). A liquid flow meter is installed on the liquid feed pipe. The liquid flow meter is used to measure the mass of the liquid raw material entering the reactor (1).

2. The polyimide synthesis apparatus according to claim 1, characterized in that, The weighing module (6) includes: a weighing platform, a weighing sensor, and a support structure; The weighing platform is used to place the solid raw material to be weighed; the weighing sensor is located below the weighing platform and is directly or indirectly connected to the weighing platform, and is used to convert the weight of the solid on the weighing platform into an electrical signal; the support structure is used to support the weighing platform and the weighing sensor.

3. The polyimide synthesis apparatus according to claim 1 or 2, characterized in that, It also includes a reflux condenser (8), which is connected to the interior of the reactor (1) through a reflux exhaust pipe (9).

4. The polyimide synthesis apparatus according to claim 3, characterized in that, The reflux condenser (8) includes: a condenser (82) and a liquid collection bottle (83); The condenser (82) has an exhaust port (81) at the top and its bottom is connected to the liquid collection bottle (83). The liquid collection bottle (83) has a drain valve (84) at its bottom.

5. The polyimide synthesis apparatus according to claim 4, characterized in that, The condenser (82) includes a shell, inside which are arranged a plurality of circular cavities. The plurality of circular cavities are connected in sequence in the vertical direction. The uppermost circular cavity is connected to the exhaust port (81), and the lowermost circular cavity is connected to the liquid collection bottle (83).

6. The polyimide synthesis apparatus according to claim 4, characterized in that, The collection bottle (83) is made of transparent material.

7. The polyimide synthesis apparatus according to claim 3, characterized in that, The solid raw material conveying mechanism (4) includes: a screw feeder (41) and a solid raw material bin (42); The screw feeder includes: a tubular shell, inside which a screw blade is provided, the screw blades propelling solid raw material along the length of the tubular shell into the solid feed pipe by rotation; The bottom or side of the solid raw material silo is connected to the inlet of the screw feeder so as to supply the stored solid raw materials to the screw feeder.

8. The polyimide synthesis apparatus according to claim 3, characterized in that, The liquid raw material conveying mechanism (5) includes: a liquid raw material tank (51) and a centrifugal pump (52); The liquid raw material tank (51) is used to store liquid raw materials to be transported. The liquid raw material tank (51) has one or more inlets for adding liquid raw materials into the tank and one outlet for discharging liquid raw materials. The centrifugal pump (52) is connected to the outlet of the liquid raw material tank (51) and is used to extract the liquid raw material from the liquid raw material tank (51) and pump it into the liquid feed pipe.

9. The polyimide synthesis apparatus according to claim 3, characterized in that, A stirring device is also provided inside the reaction vessel (1), and a variable frequency motor (10) is provided on the top of the stirring rod of the stirring device.

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