PREPARATION METHOD OF ALIPHATIC POLYESTER

摘要

PURPOSE: A method for preparing aliphatic polyester is provided, which has high melt viscosity, is degraded to harmless substances rapidly, is cheap, and is applied to blown-film molding, foaming molding and vacuum molding. CONSTITUTION: The method comprises the steps of injecting an aliphatic diol selected from ethylene glycol, 1,4-butanediol and 1,6-hexanediol, an acid selected from succinic acid, adipic acid and adipic anhydride, and a monomer selected from maleic acid and maleic anhydride for improve the high melt viscosity, into a reactor provided with a stirrer and a condenser and carrying out the esterification of the mixture at the temperature below 220°C; and injecting a catalyst into the reactor and carrying out the deglycolization and addition reaction at 190-250°C and at the pressure of 0.005-1 mmHg to obtain aliphatic polyester.