METHOD FOR PREPARING OF POLYAMIDE RESIN AND POLYAMIDE RESIN

摘要

PURPOSE: A manufacturing method of a polyamide resin is provided to induce raise of heat decomposition temperature, and decrease of melting point, even maintaining ultra high absorption, thereby capable of manufacturing a polyamide resin of which spinning processability and thermal resistance. CONSTITUTION: A manufacturing method of a polyamide resin comprises: a lactam polymerization step manufacturing a polymer by polymerizing C5-7 lactam at 250-280 °C; and a 2-pyrrolidone polymerization step manufacturing a copolymer by polymerizing the polymer and 2-pyrrolidone at 130-200 °C. The relative viscosity of the polyamide resin is 1.9 or higher. The polyamide resin is a copolymer of the C5-7 lactam, and 2-pyrrolidone. The content of the 2-pyrrolidone is 30 mol% or higher of the total polyamide resin.