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Method for preparing aramid IIII fiber

A fiber and aramid fiber technology, applied in the field of preparation of aramid fiber III, can solve the problems of low spinning efficiency, investment cost and high spinning cost, and achieve lower spinning cost, investment cost and spinning cost, investment cost reduction effect

Inactive Publication Date: 2010-10-06
SINOSELEN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, aramid III fiber is wet-spun, and the spinning rate is generally 10m / min to 15m / min; the polymer concentration is lower than 5wt%, resulting in low spinning efficiency and high investment and spinning costs.

Method used

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  • Method for preparing aramid IIII fiber
  • Method for preparing aramid IIII fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Referring to Figure 1, the preparation method of aramid III fiber is as follows:

[0024] 1. Synthetic spinning dope.

[0025] Using p-phenylenediamine (abbreviated as PDA), terephthaloyl chloride (abbreviated as TPC), 5(6)-amino-2-(4-aminophenyl) benzimidazole (abbreviated as PAZ) three monomers are The raw material is low-temperature copolymerization with dimethylacetamide / lithium chloride as the solvent system, the temperature is 0-20°C, and the time is 3-5 hours, and the spinning stock solution of aramid fiber III or aramid fiber III polymer is obtained stock solution.

[0026] The dosage of TPC, PAZ, PDA and solvent dimethylacetamide, lithium chloride is: TPC: 203.0 grams, PAZ: 67.2 grams, PDA: 75.6 grams, dimethylacetamide: 1960.0 grams, lithium chloride: 68.6 grams , the molar ratio of the three monomer raw materials is: TPC:PAZ:PDA=100:30:70, liquid crystal phenomenon does not appear in the stock solution, and the concentration of the polymer formed by the pol...

Embodiment 2

[0034] The dosage of TPC, PAZ, PDA and solvent system dimethylacetamide and lithium chloride is: TPC: 203.0 grams, PAZ: 67.2 grams, PDA: 75.6 grams, dimethylacetamide: 1960.0 grams, lithium chloride: 68.6 gram, the molar ratio of three kinds of monomer raw materials is: TPC: PAZ: PDA=100: 30: 70, liquid crystal phenomenon does not appear in stock solution. The polymer concentration in the spinning stock solution was 15 wt%, the spinning speed was 300 m / min, and the temperature of the hot nitrogen gas was 230°C. The prepared aramid III raw silk is washed and dried, and then processed by continuous heat treatment process. The heat treatment temperature is 450°C, the tension of the tow is controlled at 0.5CN / tex, and the heat treatment time is 20 seconds. Ten samples of the obtained aramid fiber III were tested, and the average value was taken. The tensile strength was 5.32GPa, and the modulus was 182GPa.

Embodiment 3

[0036] The dosage of TPC, PAZ, PDA and solvent system dimethylacetamide and lithium chloride is: TPC: 203.0 grams, PAZ: 67.2 grams, PDA: 75.6 grams, dimethylacetamide: 1383.2 grams, lithium chloride: 48.4 gram, the molar ratio of three kinds of monomer raw materials is: TPC: PAZ: PDA=100: 30: 70, liquid crystal phenomenon does not appear in stock solution. The polymer concentration in the spinning stock solution was 20 wt%, the spinning speed was 250 m / min, and the temperature of the hot nitrogen gas was 210°C. The prepared aramid III raw silk is washed and dried, and then processed by continuous heat treatment process. The heat treatment temperature is 450°C, the tension of the tow is controlled at 0.5CN / tex, and the heat treatment time is 15 seconds. Ten samples of the obtained aramid fiber III were tested, and the average value was taken. The tensile strength was 5.16GPa, and the modulus was 176GPa.

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Abstract

The invention relates to a method for preparing an aramid IIII fiber, which comprises the following steps of: (1) synthesizing a spinning stock solution, carrying out low-temperature copolymerization by adopting three monomers of p-phenylenediamine, paraphthaloyl chloride and 5(6)-amido-2-(4-amidophenyl)benzimidazole as raw materials and adopting dimethylacetylamide / lithium chloride as a solvent; (2) spinning by adopting a dry method spinning process, i.e. leading the spinning stock solution obtained in the previous step to pass through a spinneret and directly enter a hot inert gas channel and evaporating and removing the solvent in the spinning stock solution by utilizing a hot inert gas to obtain cured raw yarn; and (3) carrying out water washing and heat treatment on the raw yarn and winding to obtain the aramid IIII fiber. The method has high solid content of the spinning stock solution, high spinning speed, great improvement of spinning efficiency, obvious reduction of fiber manufacturing cost, improved mechanical performance of the manufactured aramid IIII fiber and wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of aramid fiber III. Background technique [0002] Due to the integrated design and manufacture of organic fiber-reinforced resin-based composite materials, the aircraft parts can not only reduce the weight by 20-30% than the aircraft parts manufactured by traditional metal materials and methods, but also reduce the use and maintenance costs by 15-25% compared with metal materials. %, thus resin-based composites have been widely used in the aerospace field. Among them, high-performance fiber is the most important component of resin matrix composites. [0003] As a high-strength and high-modulus organic fiber, aramid III fiber (called Armos fiber in Russia) has become a reinforcing fiber for the preparation of advanced aerospace composite materials. Russian patent RU2074182 and RU2130980 have introduced the production technology of this resin and fiber, and it is specifically made of p-phenylenediamine, te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/80D01D5/04D01D1/02C08G69/32
Inventor 侯庆华戴玲连宏光陈丹红
Owner SINOSELEN HI TECH
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