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Solidification method for preparing para-aramid by adopting dry jet-wet spinning

A technology of wet spinning and para-aramid, which is applied in the direction of spinning solution preparation, wet spinning, rayon manufacturing, etc., can solve the problems affecting the strength and surface morphology of primary fibers, and achieve the reduction of apparent defects, The effect of suppressing the diffusion rate and reducing the production cost

Inactive Publication Date: 2015-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no specific introduction about the coagulation method of para-aramid fiber prepared by dry spray-wet method at present, and the concentration of coagulation bath, coagulation temperature, coagulation time and height of air section greatly affect the strength and surface morphology of the as-spun fiber. Therefore urgently need to provide a kind of coagulation forming method that is applicable to para-aramid fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A coagulation forming method for preparing para-aramid fibers by dry spraying-wet spinning, the specific steps are:

[0025] Concentrated sulfuric acid (AR grade, concentration (95-98)%, Kunshan Jingke Microelectronics Material Co., Ltd.) and oleum (analytical grade, SO 3 The mass fraction is 50%, Shanghai Zhenxing Chemical Reagent Factory No. 2), and the concentrated sulfuric acid with a mass fraction of 99.5% to 100% is obtained by mixing, cooled and solidified under -10°C environment, and then mixed with PPTA resin (η inh =5.8dL / g, Hebei Silicon Valley Chemical Co., Ltd.) -10 ℃ low temperature blending to obtain PPTA-H 2 SO 4 The blend, wherein the mass fraction of PPTA is 18.5%, the blend is mixed and dissolved by a twin-screw at 90°C to obtain a PPTA liquid crystal solution, which is defoamed and filtered to obtain PPTA-H 2 SO 4 spinning dope.

[0026] PPTA-H 2 SO 4 The spinning stock solution is extruded from the spinneret, and the diameter of the spinneret ...

Embodiment 2

[0029] A coagulation forming method for preparing para-aramid fibers by dry spraying-wet spinning, the specific steps are:

[0030] Concentrated sulfuric acid (AR grade, concentration (95-98)%, Kunshan Jingke Microelectronics Material Co., Ltd.) and oleum (analytical grade, SO 3 The mass fraction is 50%, Shanghai Zhenxing Chemical Reagent Factory No. 2), and the concentrated sulfuric acid with a mass fraction of 99.5% to 100% is obtained by mixing, cooled and solidified at -12°C, and then mixed with PPTA resin (η inh =5.8dL / g, Hebei Silicon Valley Chemical Co., Ltd.) at -12 ℃ low temperature blending, to obtain PPTA-H 2 SO 4 The blend, wherein the mass fraction of PPTA is 18.5%, the blend is mixed and dissolved by a twin-screw at 90°C to obtain a PPTA liquid crystal solution, which is defoamed and filtered to obtain PPTA-H 2 SO 4 spinning dope.

[0031] PPTA-H 2 SO 4The spinning stock solution is extruded from the spinneret, and the diameter of the spinneret hole on the ...

Embodiment 3

[0034] A coagulation forming method for preparing para-aramid fibers by dry spraying-wet spinning, the specific steps are:

[0035] Concentrated sulfuric acid (AR grade, concentration (95-98)%, Kunshan Jingke Microelectronics Material Co., Ltd.) and oleum (analytical grade, SO 3 The mass fraction is 50%, Shanghai Zhenxing Chemical Reagent Factory No. 2), and the concentrated sulfuric acid with a mass fraction of 99.5% to 100% is obtained by mixing, cooled and solidified under -11°C environment, and then mixed with PPTA resin (η inh =5.8dL / g, Hebei Silicon Valley Chemical Co., Ltd.) -11 ° C environment to obtain PPTA-H 2 SO 4 The blend, wherein the mass fraction of PPTA is 18.5%, the blend is mixed and dissolved by a twin-screw at 90°C to obtain a PPTA liquid crystal solution, which is defoamed and filtered to obtain PPTA-H 2 SO 4 spinning dope.

[0036] PPTA-H 2 SO 4 The spinning stock solution is extruded from the spinneret, and the hole diameter of the spinneret on the...

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Abstract

The invention provides a solidification method for preparing para-aramid by adopting dry jet-wet spinning. The method is characterized by comprising the following specific steps: extruding a PPTA-H2SO4 spinning solution from a spinneret plate; enabling liquid flow extruded from the spinneret plate to vertically pass through an air layer and feeding to a solidification bath; leading out through a godet wheel, so as to obtain a nascent fiber; and washing, winding and drying, so as to obtain a para-aramid fiber precursor, wherein the solidification bath is sulfuric acid solution and is formed by sulfuric acid and water; the mass fraction of the solidification bath is 2.0%-15.0%; and the temperature of the solidification bath is 1-12 DEG C. The fineness of the fiber can be significantly reduced under the condition of the solidification bath; the strength of the para-aramid fiber is improved; the apparent defects of the fiber can be reduced; and the fiber quality is improved, thus the stability of a spinning process and the quality of a fiber product can be effectively improved.

Description

technical field [0001] The invention relates to a spinning process of para-aramid fiber, more specifically, the invention relates to the research on the coagulation bath of para-aramid fiber produced by dry spray-wet method, and belongs to the technical field of chemical synthetic fiber. Background technique [0002] Aramid fiber has excellent properties such as high strength, high modulus, high temperature resistance, chemical corrosion resistance, and light weight. Among them, the specific strength is 5 to 6 times that of steel wire and 2 to 3 times that of steel wire and glass fiber. It is twice that of steel wire, but its quality is only about 1 / 5 of that of steel wire. It is one of the three high-performance fibers. It is widely used in aerospace, information industry, body armor, outsourcing of optical cables and other fields. It is an indispensable new material in national economic construction and national defense construction. [0003] Para-aramid fiber is a typica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/90D01F1/10D01F11/08D01D1/02D01D5/06D01D10/06
Inventor 余木火李会刘静顾灏滕翠青秦明林杨鹏王涛孔海娟
Owner DONGHUA UNIV
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