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A modified meta-aramid fiber, its preparation method and hollow fiber membrane

A fiber membrane and aramid fiber technology, which is applied in the directions of fiber processing, fiber chemical characteristics, hollow filament manufacturing, etc., can solve the problems of difficult dry storage, high intrinsic viscosity, and poor chlorine resistance of membrane fibers, and achieve good film formation. high performance, simple preparation process and good hydrophilicity

Active Publication Date: 2021-08-06
OCHEMATE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some aspects of the performance of the existing meta-aramid fiber can no longer meet the needs of the water treatment field. Although the existing meta-aramid fiber has a zigzag orderly arrangement of its main chain, it has a good cost performance. Compared with the mainstream ultrafiltration membrane materials in the market, its cost is lower, but the existing meta-aramid fibers have poor chlorine resistance, high intrinsic viscosity ([η] > 4.5), and membrane filaments are not Disadvantages such as easy dry storage restrict its application in the field of water treatment (membrane field)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 42.45 mL of DMAc solvent, 0.077 mol of m-phenylenediamine, 0.0385 mol of ethylenediamine and 0.0385 mol of 4-fluoro-1,3-phenylenediamine into a four-necked flask, and stir to dissolve. Adjust the reaction temperature to -25°C, add 0.1155mol of isophthaloyl chloride, control the reaction temperature of the reaction system below 0°C, and continue to add 0.0262mol of isophthaloyl chloride until the viscosity of the system is stable. After the viscosity is stable, finally add 0.0123mol of isophthaloyl chloride, control the reaction temperature below 60°C until the reaction is complete, add 0.154mol of calcium hydroxide and continue to stir until the neutralization is complete (pH value = 7). At this time, the content of the modified meta-aramid polymer in the solution was 42 wt%. Take out a small part of the solution and dilute it with deionized water to obtain the modified meta-aramid polymer, and continue to wash it three times with deionized water. After the polymer ...

Embodiment 2

[0058] Under nitrogen protection, add 68.9mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0385mol of hexamethylenediamine and 0.0385mol of 4-chloro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer , stirred under nitrogen protection at room temperature until the solute was completely dissolved. Adjust the reaction temperature to -25°C with a freezing bath, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system to be lower than 0°C, and continue to add 0.0262mol of isophthaloyl dimethanol after reacting until the viscosity of the system is stable Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed and control the reaction temperature below 60°C until the reaction is complete, add 0.154mol calcium hydroxide Then c...

Embodiment 3

[0060] Under nitrogen protection, add 66.21mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0385mol of dodecanediamine and 0.0385mol of 5-trifluoromethyl-1,3-phenylenediamine into the In a 1L four-neck flask, stir under nitrogen protection at room temperature until the solute is completely dissolved. Adjust the reaction temperature to -25°C with a freezing bath, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system to be lower than 0°C, and continue to add 0.0262mol of isophthaloyl dimethanol after reacting until the viscosity of the system is stable Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed and control the reaction temperature below 60°C until the reaction is complete, add 0.154mol calcium hydroxide Then continue to stir until neutralization is complet...

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Abstract

The invention discloses a modified meta-aramid polymer and a preparation method thereof. The modified meta-aramid polymer consists of m-phenylenediamine, alkyldiamine H 2 N‑M‑NH 2 and halogenated diamine monomers and other diamine monomers are polycondensed with isophthaloyl chloride by low-temperature solution polycondensation method, wherein isophthaloyl chloride is added to the reaction solution several times. The invention also discloses a method for preparing hollow fiber membranes by using the prepared aramid fiber polymer. The modified meta-aramid polymer prepared by the present invention, while maintaining the original excellent performance, also has a lower intrinsic viscosity and better chlorine resistance, making it more suitable for spinning into hollow As for the fiber membrane, the prepared membrane thread is easier to store in a dry state, and the preparation method is simple, easy to operate, suitable for industrial production, and has a good market application prospect.

Description

technical field [0001] The invention relates to the technical field of aramid fibers and membranes, in particular to a modified meta-aramid fiber and a preparation method thereof, a modified meta-aramid hollow fiber membrane and a process for preparing the hollow fiber membrane. Background technique [0002] Meta-aramid is obtained by polycondensation of isophthaloyl chloride and m-phenylenediamine. There are two commonly used preparation methods: the first is the interfacial polycondensation method, which is to dissolve m-phenylenediamine and a small amount of acid absorbent together. Prepare an aqueous phase in water, then dissolve isophthaloyl dichloride in an organic solvent and add it to the stirred aqueous phase, the reaction occurs at the interface between the aqueous phase and the organic phase, and the polymer is separated and dried to obtain a solid product; the second One is the low-temperature solution polycondensation method, which is to dissolve m-phenylenediam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/42D01F6/80D01F11/08D01D5/24B01D71/56B01D69/08B01D69/02
CPCB01D69/02B01D69/08B01D71/56B01D2325/30C08G69/42D01D5/24D01F6/80D01F11/08
Inventor 袁新兵李彬雷冰
Owner OCHEMATE MATERIAL TECH CO LTD
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