PREPARING METHOD OF ETHYLENE PROPYLENE DIENE MONOMER(EPDM) RUBBER REINFORCED POLYAMIDE 12 COPOLYMER

摘要

PURPOSE: A preparation method of EPDM rubber reinforced polyamide 12 copolymer by using laurel lactam, a monomer of polyamide 12 instead of polyamide 12 and blending an excess catalyst with EPDM rubber is provided which improves impact strength, tensile strength and bending strength and shortens the processing time. CONSTITUTION: A process is disclosed for making ethylene propylene diene monomer rubber reinforced polyamide 12 copolymer which comprises: pouring (A)laurel lactam instead of polyamide 12; (B)2-20 wt.% of EPDM rubber substituted a functional group for anhydrous maleic acid based on 100 wt.% of laurel lactam; (C)0.3-2.1 moles of alkaline metal catalyst based on 100 moles of laurel lactam; (D)0.2-2.0 moles of normal acetyl carprolactam initiator based on 100 moles of laurel lactam into a twin screw extruder, with the proviso that when the catalyst and the initiator are poured simultaneously into the extruder with laurel lactam and EPDM, larger quantity of catalyst than the initiator is poured in it.