Device and process for preparing PGLA through ring-opening copolymerization of glycolide and lactide

The invention relates to the technical field of high polymer chemical engineering, in particular to a device and process for preparing PGLA through ring-opening copolymerization of glycolide and lactide. The process comprises the following steps: (1) carrying out a prepolymerization reaction on glycolide to provide a PGA oligomer; (2) carrying out a prepolymerization reaction on lactide to provide a PLA oligomer; (3) performing transesterification on the PGA oligomer and the PLA oligomer under the action of a transesterification catalyst to provide a low-molecular-weight PGLA polymer melt; and (4) carrying out chain extension, devolatilization and pelletizing on the low-molecular-weight PGLA polymer melt to obtain the PGLA polymer. The PLA oligomer and the PGA oligomer which are obtained after respective prepolymerization reaction of glycolide and lactide are subjected to transesterification, so that the reaction time is shortened, the formed PGLA copolymer is relatively uniform in composition and random degr