▎ 摘　　要

NOVELTY - Passive warm-keeping multi-material micro-structural fiber comprises a core layer (1) and a cladding layer (2), where the cladding layer is coated on the periphery of the core layer, the material of the core layer comprises a first polymer and a thermal functional material, the material of the cladding is a second polymer, and the thermal functional material comprises hydrophilic silica aerogel, alumina aerogel, zirconia aerogel, titanium oxide aerogel and/or graphene aerogel. USE - Passive warm-keeping multi-material micro-structural fiber for use in thermal fabric (claimed). ADVANTAGE - The passive warm-keeping multi-material micro-structural fiber has excellent mechanical properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: a method for preparing passive warm-keeping multi-material micro-structured fiber, which involves: i. adding the second polymer into a solvent to prepare a cladding solution; ii. adding a first polymer into a solvent, and then adding a thermal functional material to prepare a core layer solution; and iii. injecting the cladding layer solution and the core layer solution into a coaxial spinning needle of wet spinning equipment, extruding the cladding layer solution and the core layer solution through the coaxial spinning needle, and solidifying the cladding layer solution and the core layer solution in a solidification bath to form a primary spun fiber; and iv. soaking the spun fiber in tertiary butanol solution, and freeze-drying; and a thermal fabric comprises passive thermal insulation multi-material microstructure fiber, is obtained by weaving. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a passive warm-keeping multi-material micro-structural fiber. 1Core layer 2Cladding layer