Polyimide fiber with kidney-shaped section and preparation method thereof

A polyimide fiber, polyimide technology, applied in fiber treatment, spinning solution preparation, fiber chemical characteristics, etc. The production cost is low, the cohesion is strong, and the preparation efficiency is high.

Active Publication Date: 2015-02-04
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%. After filtering and vacuuming to remove air bubbles, spin through a wet process;

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

[0036] C: The PAA primary fiber obtained in step B is directly washed to remove the solvent, the washing temperature range is 20-80°C, heated and dried at 80°C to remove water, and then subjected to step-wise high-temperature circular drawing, the temperature range is 160-400°C , high-temperature annealing at 500 °C in a nitrogen atmosphere, and final...

Embodiment 2

[0039]A: Use low-cost PMDA and ODA to synthesize a PAA solution with a solid content of 20%. After filtering and vacuuming to remove air bubbles, spin by wet method;

[0040] B: The fibers ejected from the circular spinneret hole directly enter the coagulation bath solution with pure water and different temperatures. A coagulation bath is used, and the temperature of the coagulation bath is set at 10, 25 or 40 ° C. By changing the speed of the metering pump Regulating spinneret speed, spinning speed is 20m / min, and the length of vertical hydrazine deep is 50mm, prepares the PAA nascent fiber with kidney-shaped cross section;

[0041] C: The PAA primary fiber obtained in step B is directly washed to remove the solvent, the washing temperature range is 40-80°C, heated and dried at 100°C to remove water, and high-temperature cyclization is drawn, the temperature range is 160-450°C, and the temperature range is 160-450°C. High-temperature annealing in a nitrogen atmosphere at ℃, a...

Embodiment 3

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

[0045] B: The fibers ejected from the circular spinneret hole directly enter the coagulation bath solution with a temperature of 30°C and different coagulation bath systems. Five coagulation baths are used, and the coagulation bath system is water / ethanol, water / DMAc or water / ethylene glycol. Alcohol system, adjust the spinning speed by changing the metering pump speed, the spinning speed is 10m / min, the length of the vertical hydrazine depth is 50mm, and the PAA primary fiber with kidney-shaped cross section is prepared;

[0046] C: The PAA primary fiber obtained in step B is directly washed to remove the solvent, the washing temperature range is 30-95°C, heated and dried at 120°C to remove water, high-temperature circular drawing, the temperature range is 150-480°C, and the temperature range is 150-480°C. Hig...

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Abstract

The present disclosure provides polyimide fibers with kidney-shaped cross-section and their preparation methods thereof, falling within the technical field of polyimide fiber. Polyimide fibers with kidney-shaped cross-sections are prepared by a continuous, integrated approach, starting from a polyamic acid solution prepared by reacting an aromatic dianhydride with an aromatic diamine. PAA nascent fibers with kidney-shaped cross-sections are obtained by adopting a spinneret having circular orifices under wet spinning process. The kidney-shaped cross-sections are obtained by varying the processing condition, including spinning speed, coagulation bath composition, coagulation temperature, and depth of coagulation bath. After washing and drying, polyamic acid nascent fibers are converted to polyimide fibers with kidney-shaped cross-sections under thermal curing. The integrated preparation methods are suitable for mass industrial production.

Description

technical field [0001] The invention relates to a polyimide fiber with a kidney-shaped cross-section and a preparation method thereof, in particular to the preparation of polyimide fibers from aromatic dianhydride and aromatic diamine with circular spinneret holes, which is to prepare non-circular spinneret holes with circular spinneret holes. The invention discloses a method for forming cross-sectional PI fibers, which belongs to the technical field of polyimide fibers. Background technique [0002] Fibers with non-circular cross-sections have the following characteristics: First, they have good optical effects, especially triangular fibers, which have a light-splitting effect like a small prism, which can make natural light split and recombine, giving people a special feeling. The second is that the surface area is large, which can enhance the covering ability, reduce the transparency of the fabric, and improve the problem that the circular cross-section fiber is easy to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/253D01D5/06D01D1/02D01D10/00D01F6/74D01F6/78D01F8/16B29C48/76
CPCD01D1/103Y10T428/2973D01D5/06D01F6/74D01D1/106D01D10/02D01D5/253
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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