High-temperature-resistant branched polyamide block copolymer and preparation method thereof

The invention discloses a high-temperature-resistant branched polyamide block copolymer and a preparation method thereof. The high-temperature-resistant branched polyamide block copolymer is prepared by polymerizing 20-50 mol% of lactam, 25-40 mol% of aromatic dibasic acid and/or alicyclic dibasic acid, 25-40 mol% of aromatic diamine and/or aliphatic diamine and 0.2-0.5 mol% of compound containing three or more functional groups capable of reacting with acid or amine. Compared with the traditional high-temperature-resistant polyamide preparation technique, the preparation method has the advantages of simple technique, short polymerization time, controllable viscosity and the like, and is suitable for large-scale industrial production. The high-temperature-resistant branched polyamide block copolymer obtained by the preparation method has the characteristics of excellent product appearance color, excellent dimensional stability, favorable product toughness and the like, and is suitable for a high-temperature environment.