Modified meta-aramid, preparation method thereof and hollow fiber membrane
A fiber membrane and aramid fiber technology, which is applied to the modified meta-aramid hollow fiber membrane and the preparation of the hollow fiber membrane, modified meta-aramid fiber and its preparation field, which can solve the problem of high intrinsic viscosity and difficult membrane filaments Dry storage, restricted application and other issues
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Embodiment 1
[0055] Add 54.131 mL of DMAc solvent, 0.077 mol of m-phenylenediamine, 0.0385 mol of APBIA and 0.0385 mol of 4-fluoro-1,3-phenylenediamine into a four-neck flask, stir to dissolve. Adjust the reaction temperature to -25°C, 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 chloride until the viscosity of the system is stable. After reacting until the viscosity of the system is stable, add 0.0123mol of isophthaloyl chloride at the end, and control the reaction temperature below 60°C until the reaction is complete. After adding 0.154mol of calcium hydroxide, continue stirring until complete neutralization (pH value = 7). At this time, the content of the modified meta-aramid polymer in the solution was 17.54 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 th...
Embodiment 2
[0057] Under nitrogen protection, add 80.383mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0616mol of APBIA and 0.0154mol of 4-fluoro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer. Stir under nitrogen protection until the solute is completely dissolved. Use a freezing bath to adjust the reaction temperature to -15°C, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system below 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 of isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed to control the reaction temperature below 60°C until the reaction is complete, after adding 0.154mol of calcium hydroxide Continue stirring until neutralization ...
Embodiment 3
[0059] Under nitrogen protection, add 57.257mL DMAc solvent, 0.1386mol m-phenylenediamine, 0.0077mol APBIA and 0.0077mol 4-fluoro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer. Stir under nitrogen protection until the solute is completely dissolved. Use a freezing bath to adjust the reaction temperature to -25°C, add 0.1309mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system below 0°C, and continue to add 0.0107mol of isophthaloyl dimethanol after the reaction reaches a stable viscosity Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol of isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed to control the reaction temperature below 60°C until the reaction is complete, after adding 0.154mol of calcium hydroxide Continue stirring until neutralization is complete. At this ti...
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