Method for preparing polyaramide resin modified by aromatic heterocycle and chloromonomer
The technology of a polyaramide and a manufacturing method is applied in the field of special synthetic fiber production, and can solve the problems of difficult molecular weight, difficult recovery, and high price of lithium chloride
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Embodiment 1
[0018] Example 1: 100 parts by weight of NMP with a content of 97% and 17.7 parts of CaCl with a content of 35% 2 After mixing evenly, it was heated to 200 ℃ by a preheater, and then input into a rectifying tower to remove water, and 103.2 parts of CaCl were obtained. 2 The NMP solution with a content of 6% (water content≤150ppm) was used as a solvent. Then 40% moles of 2-5' dichloro-p-phenylenediamine and 60% moles of 2-(4aminophenyl)-5(6)aminophenylbenzimidazole were dissolved in 6% by weight CaCl 2 in NMP solvent (5% concentration of diamine in NMP). Then, the dissolved diamine solution was cooled to 2-5° C., and 50% molar terephthaloyl chloride was added under vigorous stirring to form an amine-terminated low-molecular oligomer. Then, the low-molecular oligomer was cooled to 2-5° C., and the remaining 50% mole of terephthaloyl chloride was gradually added to obtain a resin solution with a dynamic viscosity of 700 poise.
[0019] After the resin solution is filtered, it ...
Embodiment 2
[0024] Example 2: CaCl 2 The preparation method of the NMP solution with a content of 6% (water content≤150ppm) is the same as that in Example 1.
[0025] 40% moles of 2-chloro-p-phenylenediamine and 60% moles of 2-(4aminophenyl)-5(6)aminophenylbenzimidazole were dissolved in 6% by weight CaCl as in Example 1 2 in NMP solvent. Then, the dissolved diamine solution is cooled to 2-5° C., and 50% mol of terephthaloyl chloride is added under vigorous stirring to form a low molecular oligomer capped with an amine group. Then, the low molecular weight oligomer was cooled to 2-5° C., and the remaining 50% mole of terephthaloyl chloride was gradually added to obtain a resin solution with a dynamic viscosity of 900 poise.
[0026] The properties of the fibers obtained after the resin solution is degassed and spun in a falling film evaporator are as follows:
[0027] Monofilament strength 6.0GPa
[0028] The relative elongation at break is 1.9%;
[0029] Elastic modulus 172GPa,
[...
Embodiment 3
[0031] Example 3: CaCl 2 The preparation method of the NMP solution with a content of 6% (water content≤150ppm) is the same as that in Example 1.
[0032] 80% moles of 2-chloro-p-phenylenediamine and 20% moles of 2-(4aminophenyl)-5(6)aminophenylbenzimidazole were dissolved in 6% by weight CaCl as in Example 1 2 in NMP solvent. Then, the dissolved diamine solution is cooled to 2-5° C., and 50% mol of terephthaloyl chloride is added under vigorous stirring to form a low molecular oligomer capped with an amine group. Then, the low molecular weight oligomer was cooled to 2-5° C., and the remaining 50% mole of terephthaloyl chloride was gradually added to obtain a resin solution with a dynamic viscosity of 800 poise.
[0033] The properties of the fibers obtained after the resin solution is degassed and spun in a falling film evaporator are as follows:
[0034] Monofilament strength 6.0GPa
[0035] The relative elongation at break is 1.6%;
[0036] Elastic modulus 180GPa,
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