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A method for preparing spinning pulp by dissolving PPTA resin with solid foaming sulfuric acid

A technology of sulfuric acid and resin, applied in the direction of spinning solution preparation, single-component polyamide artificial filament, etc., can solve problems such as agglomeration, achieve less degradation, shorten dissolution time, and large contact area

Active Publication Date: 2017-02-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the resin powder particles are small and the specific gravity is smaller than that of sulfuric acid particles, the form of the mixture formed is that many resin particles are adsorbed on the surface of the sulfuric acid particles, which is equivalent to the uniform dispersion of sulfuric acid in the resin, and a certain degree of agglomeration will still occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) 180 kilograms of concentration is that 99.8% liquid sulfuric acid is added in foamer and is cooled to 10 ℃, keeps sulfuric acid to become liquid state. Rapidly inject 1Mpa of SO into the frozen liquid sulfuric acid 3 and N 2 The mixed gas, SO in the mixed gas 3 and N 2 The volume ratio is 1 / 5. The volume of the frozen liquid sulfuric acid expands under the impact of the gas, and due to the disturbance of external force, the sulfuric acid close to the freezing point is further cooled and solidified rapidly to form foaming solid sulfuric acid.

[0023] (2) Further reduce the temperature to -10°C, and further crush the foaming solid sulfuric acid into fine particles.

[0024] (3) The foaming solid sulfuric acid that pulverizes and 45 kilograms of PPTA powdery resins that logarithmic viscosity is 7.0 drop into multi-shaft planetary mixer and fully mix.

[0025] (4) Keep the stirrer running and vacuumize, and at the same time, heat the mixture to 85° C. for dissolut...

Embodiment 2

[0029] (1) 195 kilograms of concentration are 100.2% liquid sulfuric acid to add in foamer and be cooled to 10 ℃, keep sulfuric acid into liquid state. Rapidly inject 5Mpa of SO into the frozen liquid sulfuric acid 3 and N 2 The mixed gas, SO in the mixed gas 3 and N 2 The volume ratio is 1 / 20. The volume of the frozen liquid sulfuric acid expands under the impact of the gas, and due to the disturbance of external force, the sulfuric acid close to the freezing point is further cooled and solidified rapidly to form foaming solid sulfuric acid.

[0030] (2) Further reduce the temperature to 0° C., and further pulverize the foaming solid sulfuric acid into fine particles.

[0031] (3) The foaming solid sulfuric acid that pulverizes and 45 kilograms of PPTA powdery resin that logarithmic viscosity is 4.0 drop into multi-shaft planetary mixer and fully mix.

[0032] (4) Keep the stirrer running, vacuumize and gradually raise the temperature of the mixture to 60° C. for dissolu...

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Abstract

The invention relates to a method for preparing spinning pulp through dissolution of PPTA resin with solid foamed sulfuric acid. The method comprises steps as follows: the solid foamed sulfuric acid is cooled to the temperature of subzero 10 DEG C-0 DEG C, crushed and then mixed with the dried PPTA resin, dissolution and pre-defoaming are performed, and a pre-defoamed PPTA resin / sulfuric acid liquid crystal solution is obtained; the pre-defoamed PPTA resin / sulfuric acid liquid crystal solution is sheared and kneaded, and the spinning pulp is obtained. The method is good in mixing effect and short in dissolution time, the dissolution speed of the resin is increased, and the uniformity of the liquid crystal pulp is improved.

Description

technical field [0001] The invention belongs to the field of preparation of poly-p-phenylene terephthalamide spinning solution, in particular to a method for preparing spinning slurry by dissolving PPTA resin with solid foaming sulfuric acid. Background technique [0002] Poly(p-phenylene terephthalamide) (PPTA) fiber is a high-performance fiber widely used in various fields. It is prepared from liquid crystal solution of PPTA resin / concentrated sulfuric acid by dry jet wet spinning. One of the key points and difficulties in the PPTA fiber manufacturing process is the preparation of PPTA resin / sulfuric acid liquid crystal spinning slurry. The traditional slurry preparation method is to put PPTA resin into preheated concentrated sulfuric acid, stir rapidly, and heat to dissolve. However, due to the strong acidity of sulfuric acid, the surface of the resin will quickly dissolve and generate heat after contacting it, resulting in serious agglomeration, which makes it difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/90D01F1/10D01D1/02
Inventor 胡祖明马禹丁彬胡文兵刘倩陈蕾
Owner DONGHUA UNIV
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