Surface modification method of polyvinyl alcohol fiber for biodegradable plastic

The invention relates to a surface modification method of polyvinyl alcohol fibers for biodegradable plastics, and belongs to the technical field of biodegradable fibers. According to the method, the polyvinyl alcohol fiber is subjected to surface modification through two-step reaction. The preparation method comprises the following steps: firstly, carrying out graft modification on the polyvinyl alcohol fiber by using succinic anhydride, grafting carboxyl onto the surface of the polyvinyl alcohol fiber, and further grafting iminodiacetic acid onto the surface of the polyvinyl alcohol fiber. The maximum pull-out load and corresponding pull-out strength of the surface-modified polyvinyl alcohol fiber prepared by the method in a biodegradable plastic film are obviously superior to those of unmodified polyvinyl alcohol fiber and polyvinyl alcohol fiber subjected to surface modification by independently using succinic anhydride, and the whole biodegradable plastic subjected to fiber reinforcement still keeps biod