The invention discloses a
polyurethane waterproof
moisture-permeable film and a preparation method thereof. The
polyurethane waterproof
moisture-permeable film is prepared from the following raw materials in parts by weight: 25-45 parts of
polyurethane resin, 52-75 parts of an
organic solvent, 0.5-2 parts of a pore-forming agent and 0.1-1 part of an
inorganic filler. The method comprises the following steps: step 1, physical blending: adding a pore-forming agent into a polyurethane resin solution, stirring, adding the
inorganic filler, continuously stirring, adding the
organic solvent, uniformly stirring, and cooling to obtain a
mixed solution; and 2, preparing a film, namely pouring the
mixed solution obtained in the step 1 onto a planar medium, scraping a film on the planar medium by using a scraping tool, and
drying to form a film, thereby obtaining the polyurethane waterproof
moisture-permeable film. According to the invention, the problem of poor performance of a commercially aviable waterproof and moisture permeable film can be solved, the
moisture permeability and the
water pressure resistance of the polyurethane waterproof moisture-permeable film are effectively improved, the waterproof and moisture permeable performance of the polyurethane waterproof moisture-permeable film can be regulated and controlled, and the
breaking strength, the elongation at break and other
mechanical strength are excellent.