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Preparation system and method for para-aramid spinning solution

A para-aramid fiber spinning and configuration device technology, applied in spinning solution preparation, spinning solution filtration, filament forming treatment, etc., can solve the undisclosed first-order twin-screw and second-order twin-screw connection methods, PPTA Degradation, long residence time and other problems, to reduce the risk of PPTA degradation or gelation, high defoaming efficiency, and low equipment wear rate

Active Publication Date: 2019-02-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this design requires the mixed material to stay in the twin-screw extruder for 10-60min
According to a large number of experimental results, long-term material retention will lead to PPTA degradation
As another example, the patent ZL200510025708.3 uses a two-stage twin-screw to complete the mixing of PPTA and concentrated sulfuric acid and the subsequent dissolution and degassing, but the second-stage screw is designed to have a larger diameter (or equal diameter) than the first-stage screw. Residence time is also too long in the two-stage screw
In addition, none of the above three patents discloses the connection method of the first-order twin-screw and the second-order twin-screw

Method used

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  • Preparation system and method for para-aramid spinning solution
  • Preparation system and method for para-aramid spinning solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Concentrated sulfuric acid with a concentration of 99.8%, a temperature of 25°C and a flow rate of 255kg / h is continuously and stably conveyed to the first-stage twin-screw extruder through the sulfuric acid configuration device. Before entering the first-stage twin-screw extruder, use the jacket tube in the sulfuric acid configuration device to cool the concentrated sulfuric acid to 10±0.5°C to turn the concentrated sulfuric acid into a milky white paste.

[0042] 2) The para-aramid resin powder PPTA with an inherent viscosity of 6.5, a water content of about 100ppm and a flow rate of 63kg / h is continuously and stably metered into the first-stage twin-screw extruder under the protection of nitrogen. Medium; The mass percentage concentration of PPTA resin in the entire material is 19.8%.

[0043] 3) The first-stage twin-screw extruder quickly mixes PPTA resin powder and paste-like concentrated sulfuric acid uniformly, and is gradually dissolved into a mud-like slurry to f...

Embodiment 2

[0048] 1) Concentrated sulfuric acid with a concentration of 100.0%, a temperature of 25°C and a flow rate of 255kg / h is continuously and stably conveyed to the first-stage twin-screw extruder through the sulfuric acid configuration device. Before entering the first-stage twin-screw extruder, use the jacket tube in the sulfuric acid configuration device to cool the concentrated sulfuric acid to 5±0.5°C to turn the concentrated sulfuric acid into a milky white paste.

[0049] 2) The para-aramid resin powder PPTA with an inherent viscosity of 6.0, a water content of about 500ppm and a flow rate of 63kg / h is continuously and stably metered into the first-stage twin-screw extruder under the protection of nitrogen. Medium; The mass percentage concentration of PPTA resin in the entire material is 19.8%.

[0050] 3) The first-stage twin-screw extruder quickly mixes PPTA resin powder and paste-like concentrated sulfuric acid uniformly, and is gradually dissolved into a mud-like slurry to f...

Embodiment 3

[0055] 1) Concentrated sulfuric acid with a concentration of 100.5%, a temperature of 25°C and a flow rate of 255 kg / h is continuously and stably conveyed to the first-stage twin-screw extruder through the sulfuric acid configuration device. Before entering the first-stage twin-screw extruder, use a jacket tube to cool the concentrated sulfuric acid to 10±0.5°C to turn the concentrated sulfuric acid into a milky white paste.

[0056] 2) The para-aramid resin powder PPTA with an inherent viscosity of 6.3, a moisture content of about 300ppm and a flow rate of 61.5kg / h is continuously and stably metered into the first-stage twin-screw extrusion under the protection of nitrogen. In the machine; the mass percentage concentration of PPTA resin in the entire material is 19.5%.

[0057] 3) The first-stage twin-screw extruder quickly mixes PPTA resin powder and paste-like concentrated sulfuric acid uniformly, and is gradually dissolved into a mud-like slurry to form the first spinning dope....

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Abstract

The invention relates to a preparation system and method for a para-aramid spinning solution, and belongs to the technical field of polymer materials. In the preparation system and method, two stagesof twin-screw extruders which are connected in an L shape are used for completing the functions of para-aramid polymer resin (PPTA) and concentrated sulfuric acid mixing and subsequent dissolving / defoaming respectively. By continuously freezing and cooling concentrated sulfuric acid in the conveying process, the risk of PPTA degradation or gelation caused after concentrated sulfuric acid is mixedwith PPTA is lowered; the adopted two stages of twin screws are better matched with the mixing and dissolving / defoaming processes of PPTA; the fully-dissolved and highly-filled spinning solution is high in defoaming efficiency, and the equipment wear rate is low. By means of the preparation system and method, the purposes of high-efficiency mixing, dissolving and defoaming of para-aramid polymer resin (PPTA) and concentrated sulfuric acid are well achieved, the risk of degradation or gelation is lowered in the PPTA dissolving and defoaming process, high-quality preparation of the spinning solution is realized, and a solid foundation is laid for subsequent spinning.

Description

Technical field [0001] The invention relates to a para-aramid spinning dope preparation system and a preparation method thereof, and belongs to the technical field of polymer materials. Background technique [0002] Para-aramid fiber has the advantages of excellent mechanical properties, high temperature resistance, corrosion resistance, light weight, and good product dimensional stability. It has indispensable application value in national defense, aerospace and many civilian fields. The production of para-aramid fibers generally includes two processes: spinning dope preparation and spinning. The spinning dope is prepared by dissolving polyparaphenylene terephthalamide (PPTA) resin in concentrated sulfuric acid, and then continuously filtering and defoaming on-line, and finally using a booster pump to transport to the spinning system for metered spinning. As we all know, the preparation of the spinning dope has a significant impact on the subsequent spinning stability and the f...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01D1/10D01F6/80
CPCD01D1/02D01D1/103D01F6/805
Inventor 庹新林
Owner TSINGHUA UNIV