Polyimide fiber with kidney-shaped section and preparation method thereof

A polyimide fiber and cross-section technology, which is applied in fiber treatment, spinning solution preparation, fiber chemical characteristics, etc., can solve the problems of difficult processing of spinneret holes, small spinneret holes, etc., and achieve low production costs , strong cohesion and high preparation efficiency

Active Publication Date: 2012-07-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the spinneret hole itself is very small, it is difficult to process, and it will be more difficult to process non-circular spinneret holes.

Method used

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  • Polyimide fiber with kidney-shaped section and preparation method thereof
  • Polyimide fiber with kidney-shaped section and preparation method thereof
  • Polyimide fiber with kidney-shaped section and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A: Use low-cost PMDA and ODA to synthesize a PAA solution with a solid content of 15%, filter and vacuum to remove bubbles, and spin it through a wet process;

[0035] B: The fiber ejected from the circular spinneret directly enters the coagulation bath solution with pure water and the temperature is 25℃. Four coagulation baths are used. The spinning speed is adjusted by changing the metering pump speed. The spinning speed is set separately Set it as 15, 20 or 25m / min, and the length of the vertical hydrazine depth is 100mm, and PAA nascent fibers with a kidney-shaped cross section can be prepared;

[0036] C: The PAA nascent fiber obtained in step B is directly washed with water to remove the solvent. The washing temperature range is 20-80°C, heated and dried at 80°C to remove water, and then stepped high temperature cyclization drafting is performed, and the temperature range is 160-400°C , Annealing at high temperature in a nitrogen atmosphere at 500°C, and finally windin...

Embodiment 2

[0039] A: Use low-cost PMDA and ODA to synthesize a PAA solution with a solid content of 20%, filter and vacuum to remove bubbles, and then spin it by wet method;

[0040] B: The fiber ejected from the circular spinneret directly enters the coagulation bath solution with pure water and different temperatures. A coagulation bath is used. The temperature of the coagulation bath is set to 10, 25 or 40 ℃, and the metering pump speed is changed. Adjust the spinning speed, the spinning speed is 20m / min, the length of the vertical hydrazine depth is 50mm, and the PAA nascent fiber with kidney-shaped cross section is prepared;

[0041] C: The PAA nascent fiber obtained in step B is directly washed with water to remove the solvent. The washing temperature range is 40-80℃, heated and dried at 100℃ to remove water, high temperature cyclization drafting, the temperature range is 160-450℃, at 520 It is annealed at a high temperature in a nitrogen atmosphere at ℃, and finally wound up to obtain ...

Embodiment 3

[0044] A: Use low-cost PMDA and ODA to synthesize a PAA solution with a solid content of 25%, filter and vacuum to remove air bubbles, and spin it by wet method;

[0045] B: The fiber ejected from the circular spinneret directly enters the coagulation bath solution with a temperature of 30℃ and different coagulation bath systems. Five coagulation baths are used. The coagulation bath system is water / ethanol, water / DMAc or water / ethylene In the alcohol system, the spinning speed is adjusted by changing the rotating speed of the metering pump, the spinning speed is 10m / min, the length of the vertical hydrazine depth is 50mm, and the PAA nascent fiber with kidney-shaped cross section is prepared;

[0046] C: The PAA nascent fiber obtained in step B is directly washed with water to remove the solvent. The washing temperature range is 30-95℃, heated and dried at 120℃ to remove water, high temperature cyclization drafting, the temperature range is 150-480℃, at 500 It is annealed at a high...

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Abstract

A polyimide fiber with kidney-shaped section and a preparation method thereof belong to the technical field of polyimide fibers. The preparation method includes: utilizing polyamide acid (PAA) solution synthesized by aromatic dianhydride and aromatic diamine to perform the wet spinning process by the aid of circular spinneret holes, adjusting spinning conditions including spinneret speed, composition, proportion and temperature of coagulating bath, the length of hydrazine and the like to obtain a PAA as-formed fiber with kidney-shaped section, then washing and drying the PAA as-formed fiber, cyclizing and drafting the same at high temperature stage by stage, and winding and the like, finally obtaining the polyimide (PI) fiber with the kidney-shaped section. The preparation method of the polyimide fiber with the kidney-shaped section has the advantages of simplicity in spinneret hole design and processing, easiness in control of spinning process, high preparation efficiency, low cost for raw materials, low energy consumption and the like and can be used for large-scale industrialized production.

Description

Technical field [0001] The invention relates to a kidney-shaped cross-section polyimide fiber and an extremely preparation method, in particular to the preparation of polyimide fiber from aromatic dianhydride and aromatic diamine by using circular spinneret holes, which is non-circular A method of shaping PI fiber with cross-section belongs to the technical field of polyimide fiber. Background technique [0002] Non-circular cross-section fibers have the following characteristics: First, they have good optical effects, especially triangular fibers, which have a small prism-like light splitting effect, which can make natural light split and recombine, giving people a special feeling. The second is the large surface area, which can enhance the covering ability, reduce the transparency of the fabric, and can also improve the lack of easy pilling of the circular cross-section fibers. The third is that the special shape of the cross-section can enhance the cohesion between the fibers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/253D01D5/06D01D1/02D01D10/00D01F6/74D01F6/78D01F8/16B29C48/76
CPCD01F8/16D01D1/02D01F6/78D01D5/06D01D10/00D01F6/74D01D10/02D01D5/253Y10T428/2973D01D1/103D01D1/106
Inventor 武德珍韩恩林李论牛鸿庆商龚平齐胜利汪晓东
Owner BEIJING UNIV OF CHEM TECH
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