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Filtering method for reducing gel type impurities in polyimide fiber spinning solution

A polyimide fiber and filtration method technology, which is applied in spinning solution defoaming, fiber treatment, filament forming treatment, etc., can solve the problem of difficult filtration of gel impurities and reduce energy consumption in the spinning process , reduce power loss, and improve the filtering effect

Active Publication Date: 2015-02-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional filtration separation, the filtration system often has a better separation effect on rigid impurities, but it is difficult to filter gel impurities.

Method used

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  • Filtering method for reducing gel type impurities in polyimide fiber spinning solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The pre-filtration spinning solution in the pre-filtration storage tank 1 is sent to the pre-filtration heat exchanger 3 by the spinning solution pump 2, and then sent to the filter group 4 for filtration after cooling down to 20°C and then enters the post-filtration storage tank 5.

[0019] (2) The spinning solution in the filtered storage tank 5 is sent to the filtered heat exchanger 7 through the spinning solution pump 6 to raise the temperature to 20° C. and then sent to spinning production.

[0020] (3) The circulating water before filtration (A / B) and the circulating water after filtration (C / D) are the same medium to be recycled in the system, and the cooling unit 8 and the heating unit 9 are installed on the circulating pipeline to control the temperature of the circulating water respectively. It is necessary to adjust the temperature of the spinning solution before and after filtration.

[0021] (4) While the pre-filtration heat exchanger 3 lowers the tempe...

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Abstract

The invention relates to a filtering method for reducing gel type impurities in polyimide fiber spinning solution. The method comprises cooling pre-filtering spinning solution by 10 DEG C to 30 DEG C through a pre-filtering heat exchanger, and then sending the cooled spinning solution to a filter bank to obtain a post-filtering spinning solution; heating the post-filtering spinning solution by 10 DEG C to 30 DEG C for spinning through a post-filtering heat exchanger. The method provided by the invention is simple and energy-saving, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of methods for reducing impurities in spinning liquid, in particular to a filtering method for reducing gel impurities in spinning liquid for polyimide fibers. Background technique [0002] Due to factors such as insufficient monomer dissolution and difficult control of the reaction rate during the polymerization process, the polyimide fiber spinning solution contains a certain proportion of rigid impurities and gel-like flexible impurities in addition to solutes and solvents. Compared with ordinary solid / liquid system filtration, polyimide spinning solution is a typical non-Newtonian fluid, which has the viscoelastic properties of polymer concentrated solution. The system has high viscosity and is affected by the solid content of spinning solution, filtration temperature and The influence of factors such as filtration pressure difference is very obvious, and it is a highly difficult to filter material. [0003] At p...

Claims

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Application Information

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IPC IPC(8): D01D1/10
CPCD01D1/106
Inventor 张清华邓钢王士华赵昕
Owner DONGHUA UNIV