Biodegradable polyester elastomer toughening particle, polyglycolic acid composition and preparation method

The invention discloses biodegradable polyester elastomer toughening particles, a polyglycolic acid composition and a preparation method, and belongs to the field of polymer biodegradation. The biodegradable polyester elastomer toughening particles are polybutylene terephthalate-sebacic acid glycol ester copolyester, and are prepared from butylene terephthalate sebacic acid and terephthalic acid glycol sebacic acid glycol ester through an ester exchange condensation polymerization reaction; the polyglycolic acid composition comprises the following components: polyglycolic acid, biodegradable polyester elastomer toughening particles, a reaction type compatilizer and a composite antioxidant. According to the preparation method, biodegradable polyester elastomer toughening particles with excellent performance are prepared firstly, then chain segments of the biodegradable polyester elastomer toughening particles are connected to a molecular main chain of a polyglycolic acid matrix through a melt blending modifica