Method for preparing polyimide/silver composite conductive fiber

The invention relates to a method for preparing polyimide/silver composite conductive fiber, comprising: after removing surface impurities by ultrasonic treatment, soaking finished product polyimide fiber into alkaline solution, and leading polyimide on the surface layer of the fiber to open ring and hydrolyze to generate polyamide salt; then, soaking the polyamide salt into soluble silver salt water solution for ion exchange to form polyamic acid silver salt; finally, soaking the fiber with the polyamic acid silver salt on the surface into ascorbic acid or alkaline water solution containing aldehyde group, leading silver ion in an etch layer to be reduced and gathered on the surface, and obtaining the polyimide/silver composite conductive fiber. The method provided by the invention is simple and convenient for operation, non-toxic, free from pollution, low in cost and easy for industrialization; furthermore, the prepared composite conductive fiber not only maintains the mechanical property of matrix polyimid