Silver-plated conductive nylon fiber and preparation method thereof

A method for preparing a silver-plated conductive nylon fiber, comprising steps of:

• (1) immersing a nylon fiber in an aqueous solution containing a polyphenolic compound at 60° C. to 70° C., adding a water-soluble oxidant into the solution, continuously reacting the resultant reaction solution at 70° C. to 80° C., and obtaining a polyphenol grafted nylon fiber after the reaction is completed, wherein the polyphenolic compound contains a catechol group, and the aqueous solution of the polyphenolic compound has a concentration of 1 g/L to 5 g/L;
• (2) immersing the polyphenol grafted nylon fiber obtained in the step (1) into a solution containing silver ions at 15° C. to 25° C. for reaction, and raising the temperature to 70° C. to 80° C. for continuous reaction to obtain a surface-activated nylon fiber, wherein in the solution containing silver ions, the concentration of silver ions is 1×10−5 mol/L to 3×10−5 mol/L;
• and
• (3) carrying out chemical silver plating treatment on the surface-activated nylon fiber obtained in the step (2) to obtain the silver-plated conductive nylon fiber.