Deaeration method of polyimide spinning solution and device thereof

A technology of polyimide spinning and spinning solution, applied in the direction of foam dispersion/prevention, can solve the problems of low production capacity, large floor space, low defoaming efficiency, etc., achieving low cost, easy operation, Complete deaeration effect

Inactive Publication Date: 2015-04-22
徐东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, because domestic manufacturers mostly use storage tanks with a liquid layer height of 1 to 3 meters in the production of polyimide fibers, they adopt static intermittent decompression degassing; but the degassing efficiency of this device is very low, and the production capacity Not high, need to use multiple defoaming kettles, there are problems such as large footprint

Method used

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  • Deaeration method of polyimide spinning solution and device thereof
  • Deaeration method of polyimide spinning solution and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] S11, start the vacuum system, and set the vacuum degree to -90kPa~-98kPa; start the cooling water circulation system, so that the temperature in the defoaming kettle is cooled to 5°C; start the centrifugal module, so that the speed of the defoaming spinner is 550r / min;

[0044] S12, first-level degassing: start the feeding pump and mass flow meter, and continuously inject 100L polyimide spinning stock solution with a dynamic viscosity of 80000Pa.s into the degassing kettle at a feeding rate of 200L / h through the filter device On the spinning disc running at high speed inside, the spinning solution is dispersed and thrown out to the surroundings under the action of centrifugal force, forming a film-like spinning solution layer, which will be broken rapidly in a vacuum environment Part of the bubbles, complete the first-level degassing;

[0045] S13, two-stage gravity defoaming: the spinning solution obtained in step S12 is evenly flung onto the wall of the kettle under t...

Embodiment 2

[0054] S21, start the vacuum system, and set the vacuum degree to -90kPa~-98kPa; start the cooling water circulation system, so that the temperature in the defoaming kettle is cooled to 5°C; start the centrifugal module, so that the speed of the defoaming spinner is 550r / min;

[0055] S22, first-level defoaming: start the feeding pump and mass flow meter, pass 100L of polyimide spinning stock solution with a dynamic viscosity of 120000Pa. Put it into the high-speed rotating disc in the defoaming kettle, and under the action of centrifugal force, the spinning solution will be dispersed and thrown out to form a film-like spinning solution layer, which is in a vacuum environment. Part of the air bubbles will be rapidly broken down, and the first-level degassing will be completed;

[0056] S23, two-stage gravity defoaming: the spinning solution obtained in step S12 is evenly flung onto the wall of the kettle under the action of centrifugal force, and then flows down to the bottom ...

Embodiment 3

[0065] S31, start the vacuum system, set the vacuum degree to -90kPa~-98kPa; start the cooling water circulation system, so that the temperature in the defoaming kettle is cooled to 5°C; start the centrifugal module, so that the speed of the defoaming spinner is 550r / min;

[0066] S32, first-level defoaming: start the feeding pump and mass flow meter, pass 100L of polyimide spinning stock solution with a dynamic viscosity of 160000Pa. Put it into the high-speed rotating disc in the defoaming kettle, and under the action of centrifugal force, the spinning solution will be dispersed and thrown out to form a film-like spinning solution layer, which is in a vacuum environment. Part of the air bubbles will be rapidly broken down, and the first-level degassing will be completed;

[0067] S33, two-stage gravity defoaming: the spinning solution obtained in step S12 is evenly flung onto the wall of the kettle under the action of centrifugal force, and then flows down the wall of the ke...

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Abstract

The invention provides a deaeration method of polyimide spinning solution. The method comprises the following steps that a polyimide spinning raw solution is obtained; a vacuum module, a cooling module and a centrifugal module are started; the polyimide spinning raw solution is injected into the centrifugal module to complete a first-level deaeration; the processed polyimide spinning raw solution is tossed into the inner wall of a deaeration device, the polyimide spinning solution flows down to the bottom of the deaeration device, and a second-level deaeration is completed; a standing treatment is carried out to complete a third-level deaeration; an ultrasonic module is started to complete a fourth-level deaeration, and the polyimide spinning solution is obtained. According to the method, continuous feeding of materials is carried out under a vacuum environment, the materials are subjected to centrifugal shaking under the vacuum environment to form a film so as to realize a dynamic deaeration and a vacuum deaeration, the process of a gravity deaeration and an ultrasonic terminal deaeration under the vacuum environment improves the effect of a deaeration and covers less area, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance fibers, and in particular relates to a method and a device for defoaming polyimide spinning solution. Background technique [0002] Polyimide fiber is a high-performance fiber with high strength, high modulus and unique properties of polyimide materials. According to theoretical calculations, the modulus of the fiber synthesized by pyrophthalic anhydride and p-phenylenediamine can reach 410GPa, second only to carbon fiber, and has high thermal stability. Among them, the decomposition temperature of fully aromatic polyimide fiber can reach 500°C, which can be used in supersonic aviation and aerospace fields. It also has high radiation resistance and low temperature resistance, and has become one of the preferred materials for aerospace. First, it is also used as a filter material for high-temperature media and radioactive substances. [0003] In the process of producing po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/02
Inventor 徐东彭凌云
Owner 徐东
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