Porous protein heat insulation fiber with core-shell structure as well as preparation method and application of porous protein heat insulation fiber

Abstract

The invention discloses a porous protein heat-insulating fiber with a core-shell structure as well as a preparation method and application of the porous protein heat-insulating fiber. A protein solution is converted into a core layer structure and a shell layer structure with gradient pores through a coaxial spinning method by utilizing the phase separation difference of the protein solution caused by using a urea aqueous solution and trifluoroethanol as solvents, the shell layer is mainly composed of finger-shaped macropores, the core layer is of a uniform small-pore structure, and the shell layer and the core layer are tightly combined through a compact connecting layer. By regulating and controlling the spinning solution concentration, the coagulating bath exchange rate and the needle size, accurate construction of a hierarchical pore structure in the fiber is achieved, and the process is similar to a core-shell heat insulation mechanism of polar bear hair in the nature. The porous protein fiber with the core-shell structure shows excellent heat insulation performance and mechanical strength, has biodegradability and washing resistance, and is suitable for the high-efficiency heat insulation fields of intelligent clothing, building energy conservation, aerospace and the like.

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