Thermo-regulated fiber and preparation method thereof

A thermo-regulated fiber, comprising a polymeric phase-change material as an ingredient A and a fiber-forming polymer as an ingredient B, wherein the mass fraction of the ingredient A in the fiber is 20% to 60%, the mass fraction of the ingredient B in the fiber is 80% to 40%, and the fiber is prepared by a melt composite spinning, solution composite spinning or solution static composite spinning process, the thermo-regulated fiber has a composite structure, the cross-sectional structure is a sea-island type or a concentric sheath/core type, characterized in that the polymeric phase-change material is a polyethylene glycol n-alkyl ether, wherein the number m of the ethylene glycol repeating unit is 1 to 100, the number n of carbon atoms in the n-alkyl is 11 to 30;

• when the thermo-regulated fiber is prepared by adopting a melt composite spinning process, the fiber-forming polymer comprises at least one of a copolyester, a copolyamide, polyethylene, polypropylene, poly-4-methylpentene-1, acrylonitrile-methyl acrylate copolymer, acrylonitrile-crotononitrile copolymer and polycaprolactam;
• when the thermo-regulated fiber is prepared by adopting a solution composite spinning or solution static composite spinning process, the fiber-forming polymer comprises at least one of acrylonitrile, acrylonitrile-vinylidene chloride copolymer, and acrylonitrile-vinyl chloride copolymer;
• the heat absorption temperature and the heat release temperature of fiber are in the range of 11.9° C. to 53.8° C., the heat storage capacity is 18 to 55 J/g, and the 5% weight-loss temperature is 203° C. and more.