Aromatic polyamides are produced by subjecting an aromatic diisocyanate and an aromatic dicarboxylic acid to polycondensation in the presence of an alkali metal compound and/or an alkaline earth metal compound as a catalyst in an aprotonic polar solvent. The aromatic polyamide can be rendered suitable for use in the production of high-tenacity fibers by charging in advance the solvent, aromatic dicarboxylic acid and catalyst in a mixing system, reducing the water content in the mixing system to 50 ppm or below and then introducing the aromatic diisocyanate to conduct the polycondensation reaction.
芳香族聚酰胺的生产方法是:在有碱
金属化合物和/或碱土
金属化合物作为催化剂的情况下,在质子极性溶剂中将芳香族二
异氰酸酯和芳香族二
羧酸进行缩聚。 在混合系统中预先加入溶剂、芳香族二
羧酸和催化剂,将混合系统中的
水含量降至 50ppm 或以下,然后引入芳香族二
异氰酸酯进行缩聚反应,可使芳香族聚酰胺适用于生产高韧性纤维。