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High-strength aromatic copolyamide fiber and its preparation method

A copolyamide and aromatic technology, which is applied in the field of high-strength heterocyclic aromatic copolyamide fiber and its production, achieves the effects of reducing industrialization cost, simplifying preparation process links and easy control

Active Publication Date: 2020-07-17
崔松 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to introduce nitrile-containing groups and heterocyclic units into the main chain of the polymer by low-temperature polycondensation from molecular design and screening structure research, thereby providing a high-strength aromatic copolyamide fiber and its Complete production process from polymerization to spinning

Method used

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  • High-strength aromatic copolyamide fiber and its preparation method
  • High-strength aromatic copolyamide fiber and its preparation method
  • High-strength aromatic copolyamide fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, a kind of high-strength heterocyclic aromatic copolyamide fiber production method, carries out according to the following steps:

[0023] 1. Preparation of polymerization spinning slurry:

[0024] In the reactor under nitrogen atmosphere, according to the molar ratio of TPC:CyPPD:DAPBI =10:3.3:6.7, 0.676kg of high-purity (above 99.9%) 2,5-diaminobenzonitrile (CyPPD) and 2-( 4-aminophenyl)-5-aminobenzimidazole (DAPBI) 2.313kg of two diamine monomers were added to 100 liters (L) of dimethylacetamide (DMAc) and 3.748kg of lithium chloride (LiCl) solvent system, then stirred to completely dissolve CyPPD and DAPBI, then cooled the system to -5°C, then added 3.125kg of terephthaloyl chloride (TPC) into the system and stirred thoroughly for 3 hours to obtain an intrinsic viscosity of 7.5dL / g , a polymer homogeneous spinning stock solution with a dynamic viscosity of 110,000 centipoise;

[0025] Wherein: TPC is added in 3 times, 40% of the total amount is added ...

Embodiment 2

[0032] Embodiment 2, a kind of high-strength heterocyclic aromatic copolyamide fiber production method, carries out according to the following steps:

[0033] 1. Polymerized spinning slurry:

[0034] In the reaction kettle under nitrogen atmosphere, according to the molar ratio of TPC:CyPPD:DAPBI:PPD =10:1.7:6.6:1.7, 0.207kg of high-purity (above 99.9%) 2,5-diaminobenzonitrile (CyPPD) , 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) 1.354kg and p-phenylenediamine (PPD) 0.168kg three diamine monomers were added to 100 liters (L) of dimethylacetamide (DMAc) and 3.748kg of lithium chloride (LiCl) solvent system, then stirred to completely dissolve CyPPD and DAPBI, then cooled the system to -10°C, and then added 1.857kg of terephthaloyl chloride (TPC) into the system After being fully stirred for 3 hours, an intrinsic viscosity of 7.2dL / g and a dynamic viscosity of 90,000 centipoise polymer homogeneous spinning stock solution were obtained;

[0035] Wherein: TPC is added in 3 ti...

Embodiment 3

[0042] Embodiment 3, a kind of high-strength heterocyclic aromatic copolyamide fiber production method is carried out according to the following steps:

[0043] 1. Polymerized spinning slurry:

[0044] In the reactor under nitrogen atmosphere, according to the molar ratio of TPC:CyPPD:DAPBI=10:5:5, 1.548kg of high-purity (above 99.9%) 2,5-diaminobenzonitrile (CyPPD) and 2-( 4-aminophenyl)-5-aminobenzimidazole (DAPBI) 2.608kg of two diamine monomers were added to 100 liters (L) of dimethylacetamide (DMAc) and 5.622kg of lithium chloride (LiCl) solvent system, then stirred to completely dissolve CyPPD and DAPBI, then cooled the system to 0°C, then added 4.722kg of terephthaloyl chloride (TPC) into the system and stirred thoroughly for 3 hours to obtain an intrinsic viscosity of 6.8dL / g. Polymer homogeneous spinning dope with dynamic viscosity of 80,000 centipoise;

[0045] Wherein: TPC is added in 3 times, 40% of the total amount is added for the first time, 30% of the total a...

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Abstract

The invention discloses a high-strength aromatic copolyamide fiber. From molecular design and screening structure research, a nitrile-containing group and a heterocyclic unit are introduced into the main chain of the polymer through low-temperature polycondensation. 2, 5-diaminobenzonitrile (CyPPD), 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI), p-phenylenediamine (PPD) and terephthaloyl chloride(TPC) undergo a polymerization reaction in a molar ratio in a solvent system to produce spinning slurry, the spinning slurry is filtered and defoamed and is subjected to dry-jet wet spinning, and thewires are subjected to multi-stage drawing, washing, drying, heat treatment, oiling, drying and winding to form the fibers. The high-strength aromatic copolyamide fiber has tensile strength of 3.5-5.5Gpa, initial modulus of 110-165Gpa, elongation at break of 2.5-4.5%, monofilament fineness of 1.2-2dtex and beam fineness of 18-300tex. The preparation method of the high-strength aromatic copolyamide fiber greatly improves the production efficiency and environmental friendliness, reduces an industrial cost and keeps the production cost in a low level.

Description

technical field [0001] The invention belongs to the technical field of high molecular polymers, in particular to a high-strength heterocyclic aromatic copolyamide fiber and a production method thereof. Background technique [0002] Fully aromatic polyamide fiber, also known as aramid fiber, is a long chain with at least 85% of amide groups (CONH) and two aromatic rings on the main molecular chain formed by the reaction of aromatic diamines and aromatic dicarboxylic acid dihalides. Polyamide chain structure. It is well known that there are many types of aramid fibers, and their structural performance and performance are also very different. According to the structure, they can be divided into meta-aramid fibers and para-aramid fibers. The representative meta-aramid fibers mainly include polyisophthalamide isophthalamide Diamine (meta-aramid fiber, MPIA) has high temperature resistance, but its strength modulus is relatively low; para-aramid fiber has high strength, high modu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/80C08G69/32C08G69/26D01D5/06D01D13/00
CPCC08G69/265C08G69/32D01D5/06D01D13/00D01F6/805
Inventor 黄成柱崔松金容训黄祖林
Owner 崔松
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