▎ 摘　　要

NOVELTY - Thermal insulation polyester complex elastic fiber comprises complex elastic fiber is prepared by spinning graphene, polyester elastomer chips, polylactic acid chips and a phase solvent at a mass ratio of 10-30:20-50:15-36:2-13 through a melt method. USE - Used as thermal insulation polyester complex elastic fiber. ADVANTAGE - The complex elastic fiber has excellent adaptability to existing industrial production conditions and is convenient for large-scale use and promotion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the complex elastic fibers comprises (i) adding nano-scale graphene into the polyester polymerization system during in-situ polymerization, uniformly mixing into the stock solution of polyester elastomer through polymerization and compounding, then through casting, pelletizing, and granulation to graphene-polyester in-situ polymerization complex chip, (ii) melting polylactic acid chip and phase solvent and extruding to obtain a mixed melt and adding it to the graphene-polyester in-situ polymerization complex chips prepared in the step (i) to prepare the complex masterbatch chips of the intermediate product, and (iii) slicing the intermediate product complex masterbatch chips prepared are and drying after treatment, melt spinning.