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High-strength copolymerized aramid fiber and its preparation method

一种芳族聚酰胺、高强度的技术，应用在单组分共聚多酰胺人造长丝、纤维处理、纺丝溶液制备等方向，能够解决纺丝液生产率降低、聚合物链长度降低、共聚芳族聚酰胺纤维强度和弹性模量劣化等问题，达到优异溶解性、优异可纺性的效果

Active Publication Date: 2019-06-21
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when stretching the copolymerized aramid fiber, it causes a defect that the ends of the polymer chains are broken prematurely, which in turn causes deterioration in strength and modulus of elasticity
[0012] In addition, even though the intrinsic viscosity (IV) of the aramid copolymer is as low as about 5.0, the length of the polymer chain decreases, thus causing deterioration in the strength and modulus of elasticity of the copolymerized aramid fiber prepared above
[0013] In addition, in order to uniformly dissolve the solid-phase aramid polymer, the above-mentioned conventional method requires a long time of 24 hours or more to prepare a spinning solution by adding a neutralizing agent to the aramid copolymer obtained after polymerization. , therefore, causes the problem that the productivity of the spinning solution decreases

Method used

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  • High-strength copolymerized aramid fiber and its preparation method
  • High-strength copolymerized aramid fiber and its preparation method

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preparation example Construction

[0025] According to one aspect of the present invention, there is provided a method for preparing high-strength copolymerized aramid fibers, comprising: (i) adding a neutralizing agent to an organic solvent and then dispersing it; (ii) making the molar ratio 1: 9 to 9:1 p-phenylenediamine and cyano-p-phenylenediamine are dissolved in the above-mentioned organic solvent dispersed with a neutralizing agent; Terephthaloyl chloride in an equal molar amount is added to the above-mentioned organic solvent dispersed with a neutralizing agent and dissolved with p-phenylenediamine and cyano-p-phenylenediamine, and then reacting them to prepare a spinning solution; and (iv) Spinning the spinning solution to prepare copolymerized aramid fibers.

[0026] According to another aspect of the present invention, there is provided a method for preparing high-strength copolymerized aramid fibers, comprising: (i) p-phenylenediamine and cyano-p-phenylene with a molar ratio of 1:9 to 9:1 Diamine i...

Embodiment 1

[0046] Under a nitrogen atmosphere, 30 g of N-methyl-2-pyrrolidone (organic solvent) containing 3% by weight of calcium chloride (inorganic salt) was added to the reactor, and 6.99 g of calcium oxide (in and agent) and disperse it.

[0047] Then, 5.7 g of p-phenylenediamine and 10.55 g of cyano-p-phenylenediamine were added to the organic solvent in which the neutralizing agent was dispersed, followed by dissolving them in the reactor to prepare a mixed solution.

[0048] Next, 26.79 g of terephthaloyl chloride was added to the mixed solution in which the neutralizing agent was dispersed and p-phenylenediamine and cyano-p-phenylenediamine were dissolved, and then the solution was reacted, thereby preparing Spinning solution of family polyamide copolymer.

[0049] As a result of visually observing the prepared spinning dope, no gel or solid phase was found, and therefore, it can be seen that the aramid copolymer in the spinning dope has excellent solubility.

[0050] Then, af...

Embodiment 2

[0054] Under a nitrogen atmosphere, 30 g of N-methyl-2-pyrrolidone (organic solvent) containing 3% by weight of calcium chloride (inorganic salt) was added to the reactor, and 6.99 g of calcium oxide (in and agent) and disperse it.

[0055] Then, 5.7 g of p-phenylenediamine and 10.55 g of cyano-p-phenylenediamine were added to the organic solvent in which the neutralizing agent was dispersed, followed by dissolving them in the reactor to prepare a mixed solution.

[0056] Next, 26.79 g of terephthaloyl chloride was added to the mixed solution in which the neutralizing agent was dispersed and p-phenylenediamine and cyano-p-phenylenediamine were dissolved, and then the solution was reacted at -90° C., thereby preparing A spinning solution in which an aramid copolymer is uniformly dissolved.

[0057] As a result of visually observing the prepared spinning dope, no gel or solid phase was found, and therefore, it can be seen that the aramid copolymer in the spinning dope has excel...

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Abstract

The high-strength copolymerized aramid fiber of the present invention comprises an aramid copolymer containing an aromatic group substituted by a cyano group (-CN), and has an intrinsic viscosity (IV) of 6.0 to 8.5, a polydispersity index (PDI) of 1.5 to 2.0, a strength of 23 g / d to 32 g / d, and an elastic modulus of 1,100 g / d to 1,300 g / d. The high-strength copolymerized aramid fiber can be prepared by a method comprising: when p-phenylenediamine, cyano-p-phenylenediamine, and terephthaloyl chloride are sequentially added to an organic solvent to react together to prepare the copolymerized aramid fiber, before reacting the p-phenylenediamine, cyano-p-phenylenediamine, and terephthaloyl chloride dissolved in the organic solvent, adding a neutralizing agent to the organic solvent and dispersing it. In the present invention, hydrogen chloride (HCl) generated by the polymerization reaction of p-phenylenediamine, cyano-p-phenylenediamine, and terephthaloyl chloride is directly removed by a neutralizer dispersed in a solvent, and simultaneously converted into a metal salt, therefore, acid flocculation is not generated but an additional salt is generated, therefore, an aramid copolymer having a high intrinsic viscosity (IV) and a low polydispersity index (PDI) due to delayed acid flocculation gelation, i.e., prolonged reaction time, and due to the generation of an additional salt, can be produced, The aramid copolymer also has excellent solubility in organic solvents. By using the aramid copolymer, high-strength co-aramid fibers having good spinnability can be produced without using sulfuric acid.

Description

technical field [0001] The present invention relates to a high-strength copolymerized aromatic polyamide fiber and a preparation method thereof, more particularly, to a high-strength copolymerized aromatic polyamide fiber comprising an aromatic group containing an aromatic group substituted by a cyano group (-CN). family of polyamide copolymers, resulting in higher intrinsic viscosity (IV), lower polydispersity index (PDI), and higher strength and modulus of elasticity. In addition, the present invention provides a method for preparing high-strength copolymerized aramid fibers, wherein hydrogen chloride (HCl) generated during polymerization of the aramid copolymer is directly removed with a neutralizing agent dispersed in an organic solvent , while converting to metal salts to prevent the generation of acid crumbs, but to generate additional salts, thereby delaying the gelation caused by acid crumbs, that is, prolonging the polymerization time, so as to improve the aramid copo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/80D01D5/00
CPCD01D1/02D01F6/805D01D5/00C08G69/00D01F1/02D10B2331/021D10B2401/061D10B2401/063
Inventor 丘南大卢暻焕
Owner KOLON IND INC
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