High-molecular-weight para-aramid pulp and preparation method thereof
A para-aramid pulp, high molecular weight technology, applied in the direction of single-component polyamide rayon, single-component synthetic polymer rayon, fiber chemical characteristics, etc., can solve the problem of low pulp strength modulus, product Small molecular weight, complex process flow and other problems, to achieve the effect of improving strength and tear performance, dimensional stability, and short process flow
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Embodiment 1
[0031] A preparation method of high molecular weight para-aramid fiber pulp, comprising the following steps:
[0032] A. refer to figure 1 The schematic diagram of the process in 2 Add 90 mL of pure N-methylpyrrolidone solvent, stir, dissolve and shake well to obtain a solvent system, then add 3.78 g of p-phenylenediamine and 0.2 g of calcium hydride into the solvent system to fully dissolve to obtain a solution of p-phenylenediamine, and then add p-phenylenediamine. The diamine solution was cooled under normal pressure to -10°C;
[0033] B. Dissolve 7.14 g of terephthaloyl chloride powder in 10 mL of pure N-methylpyrrolidone solvent at 80°C to obtain a terephthaloyl chloride solution,
[0034] C, the terephthaloyl chloride solution is gradually added in the p-phenylenediamine solution to carry out the polycondensation reaction, and stirring, the stirring speed is 1500 r / min;
[0035] D. During the reaction for 2 min, 0.4 g of polyvinylpyrrolidone solubilizer was added, and...
Embodiment 2
[0043] A preparation method of high molecular weight para-aramid fiber pulp, comprising the following steps:
[0044]A. Under nitrogen drying atmosphere, first add 2.0g LiCl into 90mL pure N-ethylpyrrolidone solvent, stir, dissolve and shake to obtain a solvent system, then add 4.11g p-phenylenediamine and 0.35g calcium hydride into the solvent system to fully dissolve , to obtain a p-phenylenediamine solution, and then the p-phenylenediamine solution was cooled under normal pressure to -5°C;
[0045] B. Dissolve 7.79g of terephthaloyl chloride powder in 10mL of amide solvent at 80°C to obtain a terephthaloyl chloride solution,
[0046] C, the terephthaloyl chloride solution is gradually added in the p-phenylenediamine solution to carry out the polycondensation reaction, and stirring, the stirring speed is 2000r / min;
[0047] D. During the reaction for 1min, add 0.6g of alkylphenol polyoxyethylene ether solubilizer, continue the polycondensation reaction, when the mixed solut...
Embodiment 3
[0055] A preparation method of high molecular weight para-aramid fiber pulp, comprising the following steps:
[0056] A. In a nitrogen dry atmosphere, first add 1.2g CaCl 2 and 0.5g LiCl were added into 90mL pure N,N-dimethylacetamide solvent, stirring, dissolving and shaking to obtain a solvent system, and then 3.46g p-phenylenediamine and 0.4g calcium hydride were added into the solvent system to fully dissolve to obtain terephthalic acid. amine solution, and then the p-phenylenediamine solution was cooled under normal pressure to -8°C;
[0057] B. Dissolve 6.63 g of terephthaloyl chloride powder in 10 mL of pure N,N-dimethylacetamide solvent at 80°C to obtain a terephthaloyl chloride solution,
[0058] C, the terephthaloyl chloride solution is gradually added in the p-phenylenediamine solution to carry out the polycondensation reaction, and stirring, the stirring speed is 2500r / min;
[0059] D, during the reaction for 3min, add 0.6g polyvinylpyrrolidone solubilizer, conti...
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