The invention relates to a preparation method for a waterproof gas-permeable type
textile polyurethane coating agent, and belongs to the technical field of
coating agents. According to the technical scheme adopted by the invention, a
keratin solution is prepared from feathers, and is polymerized with a
polyurethane material; the
coating agent is formed after the
polyurethane material and
keratin are polymerized,
keratin is uniformly dispersed inside the material, and a continuous channel is formed in the modified coating layer, so that
water vapor penetration is facilitated; the keratin solution can effectively promote the interface between the keratin and polyurethane to have a great number of seams, so that a novel
moisture penetrating channel is formed, and therefore,
moisture penetrating amount is remarkably improved, and waterproof gas-permeable performance of the coating agent is further improved.
Keratin and polyurethane are polymerized, so that keratin loses water under a high-temperature environment, and
heat resistance of a
composite material is effectively improved; and meanwhile, in a preparation process, the polyurethane material is subjected to self-
polymerization reaction, so that number of terminal groups of
prepolymer is increased, and effective cross-linking density of the coating is improved, and therefore, a
water pressure resistance value of the coating iseffectively increased, and washing distance and
toughness of the coating are effectively improved.