The invention discloses a breathable
polyurethane fixing film. The breathable
polyurethane fixing film comprises a paper frame layer, a
polyurethane layer, an
adhesive layer and a release layer which are sequentially arranged; the polyurethane layer is a hydrophilic high-
moisture-permeability polyurethane film, the
adhesive layer is a pressure-sensitive
adhesive, through holes are formed in the pressure-sensitive adhesive, and the aperture of each through hole is 1-3 mm; the preparation method of the hydrophilic high-
moisture-permeability polyurethane film comprises the following steps: a) preparing a polyurethane
prepolymer A, b) preparing a polyurethane
prepolymer B, and c)
coating the release layer with the polyurethane
prepolymer B, and
drying the release layer in a tunnel
drying oven at the
drying temperature of 60-150 DEG C to prepare the hydrophilic high-
moisture-permeability polyurethane film with the thickness of 15-25 microns. According to the breathable polyurethane fixing film, the paper frame layer, the polyurethane layer, the adhesive layer and the release layer are arranged in a matched mode, meanwhile, the polyurethane layer with high breathability is prepared, the higher
water vapor permeability is achieved, the film is softer and more comfortable, the film is soft and breathable when being attached to the
skin, and the comfort of a patient is improved.