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Aromatic fiber spinning solution, aromatic fiber and preparation method of spinning solution

A spinning dope and aromatic technology, applied in the field of high-performance chemical materials, can solve problems such as poor solubility, unsatisfactory comprehensive performance of products, and failure of aromatic resin solution to meet spinning requirements, etc.

Pending Publication Date: 2021-07-06
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these existing technologies have complexities
[0006] Despite the above-mentioned known technologies, some aromatic resin solutions with small molecular weight or poor solubility still cannot meet the spinning requirements or have poor spinnability, which leads to unsatisfactory overall performance of the product and limits its application and development.
For example, for polyamide-imide and polyimide spinning stock solutions, because of their poor solubility, only wet spinning can be used to spin lower molecular weight resin solutions, and the fiber performance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The aromatic resin can be prepared by any known technique, and the present invention is not particularly limited thereto. In some embodiments, it is obtained by condensation of aromatic acid halides or acid anhydrides and aromatic diamines in organic solvents. Aliphatic diamines and aliphatic acid chlorides can be appropriately selected as secondary components. Exemplary organic solvents include one or more of N,N-dimethylamide, N,N-diethylamide, N-methylpyrrolidone, tetrahydrofuran, xylene, salicylic acid, and polyphosphoric acid.

[0031] Aromatic acid halides generally use aromatic diacyl halides, which can be represented by the molecular formula XOC—A—COX or XOC—A’—Y—A’—COX. In the formula X is a halogen, the most commonly used is chlorine. A and A' represent aromatic carbon nuclei (such as benzene, naphthalene, biphenyl, etc.) or divalent non-reactive substituted aromatic carbon nuclei. Exemplary non-reactive substituent groups include halogen, lower alkyl, phen...

Embodiment 1

[0059] This example provides a high-viscosity polyimide wet spinning dope and its preparation method.

[0060] Under the protection of nitrogen, add 4000g salicylic acid to the reaction kettle, raise the temperature to 180°C, stir to make it fully melt, then add 200g 4,4-diaminodiphenyl ether, 220g pyromellitic dianhydride and 5g isoquinoline After reacting at 180°C for 8h, the temperature was raised to 200°C for 4h to obtain a yellow-brown polyimide solution with an inherent viscosity of 0.92dl / g and an apparent viscosity of about 18000cp at 100°C. Add 0.2% cationic polyacrylamide into the meta-aramid resin slurry under mechanical stirring, stir evenly, filter and defoam for later use, the apparent viscosity at 100°C is about 35000cp. A polyamideimide fiber with a modulus of 62cN / dtex, a breaking strength of 16.5cN / dtex and an elongation at break of 14% was obtained by wet spinning.

Embodiment 2

[0062] This example provides a high-viscosity polyarylsulfone wet spinning dope and its preparation method.

[0063]Under the protection of nitrogen, add 5L DMAC into the reaction kettle, start stirring, add 500g of 4,4'-diaminophenyl sulfone into the reaction kettle, cool down to -5°C after completely dissolving, and add 410g of terephthalate in batches formyl chloride, keep the temperature of the reaction system not exceeding 50°C, continue the reaction for 30 minutes after the addition of the feed, and finally, add measured 150g of calcium hydroxide for neutralization to obtain polydiaminodiphenylsulfone terephthalamide with a solid content of about 13wt% The resin solution has an apparent viscosity of about 48000cp at 70°C. Add 0.5% sodium dodecylbenzene sulfonate by resin mass to the meta-aramid resin slurry under mechanical stirring, stir evenly, filter and defoam for later use, the apparent viscosity at 70°C is about 72000cp. A polyarylsulfone fiber with a modulus of 1...

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Abstract

The invention discloses an aromatic fiber spinning solution, aromatic fiber and a preparation method of the aromatic fiber spinning solution. The aromatic fiber spinning solution is obtained by mixing the following components of (a) an aromatic resin reaction solution obtained by reacting raw materials for preparing aromatic resin in a solvent, and (b) a surfactant. The viscosity of the aromatic fiber spinning stock solution containing the surfactant is improved compared with the viscosity of the aromatic fiber spinning stock solution not containing the surfactant. According to the method, the apparent viscosity of the aromatic fiber spinning solution is increased, the spinning stability in the spinning process can be improved, the comprehensive performance of the aromatic fiber is further improved, and meanwhile, the spinning rate can be increased; and the method is suitable for multi-station spinning, so that the spinning efficiency is improved.

Description

technical field [0001] The invention belongs to the field of high-performance chemical materials, and in particular relates to an aromatic fiber spinning stock solution, an aromatic fiber and a preparation method thereof. Background technique [0002] Aromatic fibers include fibers made of meta-aramid, heterocyclic aramid, polyarylsulfone, polyimide, polyamideimide, etc., due to their excellent high temperature resistance, high strength, high modulus, electrical insulation , Wear-resistant, dimensionally stable, flame-retardant and other properties are widely used in high-tech fields such as national defense, aerospace, electric power, electronic components, and transportation. [0003] Since aromatic fibers usually have a high melting point and cannot be melt-spun, they are generally prepared by solution spinning. Solution spinning can be divided into dry spinning, dry-wet spinning and wet spinning. Among them, the performance of the fiber obtained by dry spinning is the ...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01F6/90
CPCD01F6/94D01F1/10D01F6/90
Inventor 曹凯凯刘玉峰伍威曹卓袁锋李忠良杨佑
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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