Biodegradable copolyester with branched chain structure and preparation method thereof

The invention relates to the technical field of biodegradable copolyester preparation, in particular to biodegradable copolyester with a branched chain structure and a preparation method of the biodegradable copolyester. The biodegradable copolyester with the branched chain structure is prepared from the following components in parts by weight: 3 to 5 parts of polyol, 0.01 to 0.1 part of polyoxyethylene ether, 2 to 4 parts of aromatic dibasic acid, 2 to 4 parts of aliphatic dibasic acid and 0.001 to 0.012 part of titanate. The biodegradable copolyester prepared by the technology provided by the invention has good thermal stability; the biodegradable copolyester prepared by the technology provided by the invention has a long branched chain structure, can improve the fluidity in the processing process, also improves the mechanical properties of the biodegradable copolyester, and especially can improve the hydrophobicity of a membrane material when being added into a raw material for preparing the membrane mater