| 摘要 |
A method for preparing a polyamide polymer is provided to obtain a polyamide(nylon 6) polymer having excellent dyeing property and fastness and capable of dark color dyeing while avoiding a need for tin or heavy metals. The method for preparing a polyamide polymer via polymerization of epsilon-caprolactam comprises adding 0.2-0.8 parts by weight of an aromatic diamine compound as a dyeing property modifier based on 100 parts by weight of epsilon-caprolactam during the polymerization, and further adding a magnesium compound and an organic copper compound each in an amount of 50ppm or less on the metal element basis. The mixed material are extracted and dried to obtain a viscosity relative to sulfuric acid of 2.5-3.0 and a terminal amine content of 60-90 meq/kg.
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