Polyurethane coating having waterproof function and moisture permeation was synthesized by the pre-polymerization of mixed polyols from (PEA, PTMG and PPG) / PEG with MDI, followed by the chain extension with 1,4-butylene glycol.

• 以(PEA、PTMG、PPG)/PEG混合多元醇作为聚醚二醇组分与MDI进行预聚；然后用1；4-丁二醇扩链合成具有防水、透湿性的聚氨酯涂层剂.