The invention relates to a compound
protein fiber and a preparation method thereof. The compound
protein fiber comprises the following components in percentage by
mass: 10 to 45 percent of collagen, 10 to 45 percent of
soybean protein and 10 to 80 percent of
polyvinyl alcohol. The preparation method of the compound
protein fiber comprises the following steps of: dissolving the collagen and the
soybean protein in water, adding the
polyvinyl alcohol, dissolving, and performing copolymerization modification to obtain
spinning solution; and performing processes such as wet
spinning, solidification molding, acetalation treatment and the like to obtain the compound
protein fiber. The invention has the characteristics that: the compound
protein fiber which has a high
mechanical property, a high
moisture absorption property, high air permeability, a high
dyeing property, smooth handfeel, soft luster,
skin intimate performance and health-care performance and is comfortably worn is manufactured by performing blending and copolymerization modification on the
polyvinyl alcohol by using the collagen and the
soybean protein; and the collagen and the soybean protein have wide
raw material resources and low prices, a manufacturing process is relatively simple, and production cost is reduced.