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High-strength and high-elongation heterocyclic aromatic polyamide fiber and preparation process thereof

A technology for heterocyclic aromatic and polyamide fibers, applied in the direction of single-component copolyamide rayon, fiber chemical characteristics, single-component synthetic polymer rayon, etc., can solve problems such as low elongation, and achieve High elongation, increased interaction force, high strength and elongation effect

Active Publication Date: 2021-11-19
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The purpose of this invention is to provide a kind of high strength and high elongation for the shortcoming of existing high-strength heterocyclic aramid fibers with low elongation. Heterocyclic Aramid Fiber

Method used

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  • High-strength and high-elongation heterocyclic aromatic polyamide fiber and preparation process thereof
  • High-strength and high-elongation heterocyclic aromatic polyamide fiber and preparation process thereof
  • High-strength and high-elongation heterocyclic aromatic polyamide fiber and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A high-strength and high-elongation heterocyclic aromatic polyamide fiber, the molecular structure of the fiber is formed by randomly connecting four repeating units of the following structural formula,

[0051]

[0052] in,

[0053] Ar in repeating unit (Ⅲ) 1 for , Ar in the repeating unit (Ⅳ) 2 for ;

[0054] The molar percentage content of each repeating unit in the molecular composition structure is as follows:

[0055] Repeating unit (I) 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) is 40%;

[0056] Repeating unit (II) p-phenylenediamine (PPDA) is 30%;

[0057] Repeating unit (Ⅲ) m-phenylenediamine (MPDA) is 20%;

[0058] Repeating unit (IV) 2-chloro-p-phenylenediamine is 10%;

[0059] After testing, the tensile breaking strength of the high-strength and high-elongation heterocyclic aromatic polyamide fiber is 25.4cN / dtex, the elongation is 5.0%, the modulus is 666cN / dtex, and the strength of the dipped yarn is 5020MPa.

Embodiment 2

[0061] A high-strength and high-elongation heterocyclic aromatic polyamide fiber, the molecular structure of the heterocyclic aromatic polyamide is formed by randomly connecting four repeating units of the following structural formula,

[0062]

[0063] in,

[0064] Ar in repeating unit (Ⅲ) 1 for , Ar in repeating unit (IV) 2 for ;

[0065] The molar percentage content of each repeating unit in the molecular composition structure is as follows:

[0066] The repeating unit (I) 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) is 65%;

[0067] Repeating unit (II) p-phenylenediamine (PPDA) is 15%;

[0068] The repeating unit (Ⅲ) 4,4'-diaminodiphenyl ether (DADPE) is 15%;

[0069] The repeating unit (IV) 2,5-diaminobenzonitrile (CN-PPDA) is 5%;

[0070] After testing, the tensile breaking strength of the high-strength and high-elongation heterocyclic aromatic polyamide fiber is 30.6cN / dtex, the elongation is 5.7%, the modulus is 509cN / dtex, and the strength of the dipped...

Embodiment 3

[0072] A high-strength and high-elongation heterocyclic aromatic polyamide fiber, the molecular structure of the heterocyclic aromatic polyamide is formed by randomly connecting three repeating units of the following structural formula,

[0073]

[0074] in,

[0075] Ar in repeating unit (Ⅲ) 1 for , Ar in repeating unit (IV) 2 for ;

[0076] The molar percentage content of each repeating unit in the molecular composition structure is as follows:

[0077] The repeating unit (I) 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) is 90%;

[0078] The repeating unit (Ⅲ) 3,4'-diaminodiphenyl ether (MADPE) is 5%;

[0079] Repeating unit (IV) 2,5-dichloro-p-phenylenediamine is 5%;

[0080] After testing, the high-strength and high-elongation heterocyclic aromatic polyamide fiber has a tensile breaking strength of 33.4cN / dtex, an elongation of 4.7%, a modulus of 827cN / dtex, and a dipped filament strength of 5411MPa.

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Abstract

The invention discloses high-strength and high-elongation heterocyclic aromatic polyamide fiber and a preparation process thereof, and belongs to the field of special organic fibers. According to the invention, modified monomers such as chlorine-containing p-phenylenediamine, 2,5-diaminobenzonitrile, m-phenylenediamine, 4,4'-diaminodiphenyl ether and 3,4'-diaminodiphenyl ether are introduced into a molecular structure of heterocyclic aramid fiber, so that the high tensile breaking strength of the heterocyclic aramid fiber is maintained, and meanwhile, the aims of greatly improving the elongation and having better compound performance are fulfilled. According to the invention, a spinning solution obtained through polymerization is subjected to defoaming, filtering, plastic stretching, water washing, drying, oiling and heat treatment, and finally the finished fiber is obtained through winding; the tensile breaking strength of the high-strength and high-elongation heterocyclic aromatic polyamide fiber ranges from 28.0 cN / dtex to 35.0 cN / dtex, and the elongation ranges from 4.5% to 10.0%; and the high-strength and high-elongation heterocyclic aromatic polyamide fiber has a wide application prospect in the field of national defense and military industry, particularly, in the bulletproof field and the special rubber reinforcing field.

Description

technical field [0001] The present invention relates to a preparation method of heterocyclic aromatic polyamide fiber, more specifically, the present invention relates to a high-strength and high-elongation heterocyclic aromatic polyamide fiber and its preparation process, belonging to special organic fiber preparation field. Background technique [0002] Heterocyclic aromatic polyamide fiber, also known as heterocyclic aramid fiber or aramid fiber III, is prepared by introducing heterocyclic aromatic diamine on the basis of para-aramid fiber (aramid fiber II). Because the introduction of heterocyclic diamine destroys the regularity of the para-aramid fiber structure and slows down the crystallization speed of the para-aramid fiber, it helps to increase the draw ratio and orientation degree of the fiber during the spinning process, so the heterocyclic diamine Ring aramid has more excellent strength and modulus. However, similar to other high-performance fibers, the elongat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/80C08G69/32
CPCD01F6/805C08G69/32
Inventor 李兰英周万立彭涛何鑫业林志娇
Owner CHINA BLUESTAR CHENGRAND CO LTD
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