▎ 摘　　要

NOVELTY - Laminated structure hollow micro-nano fiber non-woven material comprises upper surface layer, lower surface layer, and middle layer arranged between the upper layer and the lower layer. The upper and lower surface layers are both hollow nano-fiber layers with dense fibers stacked, and the middle layer is hollow micron fiber layer with fluffy fibers stacked. The thickness of the intermediate layer is greater than that of the upper surface and lower layers. USE - The nonwoven material is useful in field of cold protection and heat preservation (claimed), designing and developing high performance cold-proof thermal textile product and safety protective clothing. ADVANTAGE - The non-woven material has high performance cold-proof thermal textile product and safety protective clothing. The pipe wall of the hollow fiber doped far infrared particles can absorb and radiate far infrared, and can further improve the thermal performance of the non-woven material. The hollow structure of the micro nano fiber and the multi-layer laminated stacking structure can improve the static air content of the material. In addition, the far infrared nano-particles contained in the hollow fiber tube wall can absorbs and radiates far infrared ray, so that it has high efficiency cold-proof and warm-keeping performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing nonwoven material, comprising (1) dissolving polyacrylonitrile powder in solvent, adding far-infrared nanoparticles and uniformly dispersing to obtain mixed solution of polyacrylonitrile/far-infrared nanoparticles, (2) using the polyacrylonitrile/far-infrared nanoparticle mixed solution as the shell layer, using the temperature-controllable humid air as the core layer, spinning by coaxial electrospinning method, using the liquid coagulation pool to receive the spun fibers, adjusting the properties of the spinning solution and the parameters of the spinning process through the gradient, and obtaining laminated micro-nanofiber assembly with different fiber diameters and hollowness, and (3) carrying out hydroentanglement reinforcement to the laminated structure micro-nanofiber assembly obtained in the step (2), and blasting and drying to prepare laminated structure hollow micro-nanofiber nonwoven material.