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High-strength copolymerized aramid fiber and preparing method therefor

An aramid, high-strength technology, used in single-component copolyamide rayon, fiber processing, spinning solution preparation, etc. chain scission and other problems, to achieve the effect of excellent spinnability and excellent solubility

Active Publication Date: 2017-05-10
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 preparing method therefor
  • High-strength copolymerized aramid fiber and preparing method therefor

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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

A high-strength copolymerized aramid fiber of the present invention comprises an aramid copolymer containing a cyano group (-CN) substituted aromatic group, and has an intrinsic viscosity (IV) of 6.0-8.5, a polydispersity index (PDI) of 1.5-2.0, a strength of 23-32 g / d, and an elastic modulus of 1,100-1,300 g / d. The high-strength copolymerized aramid fiber may be prepared by a method in which, when para-phenylenediamine, cyano-para-phenylene diamine, and terephthaloyl dichloride are sequentially added to and reacted with an organic solvent to prepare a copolymerized aramid fiber, a neutralizing agent is put into and dispersed in the organic solvent in a step before the reaction of the para-phenylenediamine, cyano-para-phenylene diamine, and terephthaloyl dichloride, which are dissolved in the organic solvent. In the present invention, hydrogen chloride (HCl) generated from the polymerization reaction of para-phenylenediamine, cyano-para-phenylene diamine, and terephthaloyl dichloride is directly removed by the neutralizing agent dispersed in the solvent, and is simultaneously changed into a metal salt, and therefore, acid crumbs are not generated and an additional salt is rather generated, and thus, an aramid copolymer, which has a high intrinsic viscosity (IV) and a low polydispersity index (PDI) since the gelation by the acid crumbs is delayed, that is, the reaction time is lengthened, and which also has excellent solubility in an organic solvent since the additional salt is generated, can be prepared, and a high-strength copolymerized aramid fiber can be prepared with favorable spinnability by using the aramid copolymer even without using sulfuric acid.

Description

technical field [0001] The present invention relates to a high-strength copolymerized aramid fiber and a preparation method thereof, more particularly, to a high-strength copolymerized aramid fiber comprising an aromatic polyamide copolymer containing an aromatic group substituted by a cyano group (-CN), so that it has a higher intrinsic viscosity (IV), a lower polydispersity index (PDI), and a higher strength and elastic modulus. In addition, the present invention provides a method for producing a high-strength copolymerized aramid fiber, wherein hydrogen chloride (HCl) generated during the polymerization of the aramid copolymer is directly removed with a neutralizer dispersed in an organic solvent while being converted into a metal salt to prevent the generation of acid crumbs, and instead generates another salt to delay gelation due to acid crumbs, that is, to prolong the polymerization time so as to increase the intrinsic viscosity (IV) of the aramid copolymer while narrowin...

Claims

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Application Information

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Patent Type & Authority Applications(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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