Double-layer amidoxime functional fiber material connected through multi-amino compound and preparation method of double-layer amidoxime functional fiber material

The invention belongs to the technical field of functional polymer materials, and particularly relates to a double-layer amidoxime functional fiber material connected through a multi-amino compound and a preparation method of the double-layer amidoxime functional fiber material. The double-layer amidoxime functional fiber material comprises a double-layer structure, one layer is a fiber layer formed by carboxylated polyacrylonitrile fibers, and the other layer is a compound layer formed by amidoximation of all amidogens in branched chain multi-amino polyacrylonitrile. Grafting the compound layer onto the fiber layer through an amido bond formed by carboxyl in the carboxylated polyacrylonitrile fiber and amino in the branched chain polyamino polyacrylonitrile; the branched chain multi-amino polyacrylonitrile is polyacrylonitrile obtained by carrying out addition reaction on all nitrile groups in polyacrylonitrile and amino groups in a multi-amino compound. The double-layer amidoxime functional fiber material h