The invention relates to a microporous
polyethylene breathable film and a preparation method thereof. The film is obtained by a coextrusion
blow molding method, and comprises a printing layer, a middle layer and a heat-sealing layer, wherein each of the printing layer, the middle layer and the heat-sealing layer is prepared from
calcium carbonate,
metallocene linear low density polyethylene and a
fluorine-containing
processing agent with a
mass ratio of (65 to 75):(25 to 35):(0.5 to 1.5), and the particle size of the
calcium carbonate is 1 to 2 mu m. The microporous
polyethylene breathable film has obvious advantages in indexes such as pulling strength,
hydrostatic pressure and
water vapor permeability, thus providing excellent technical guarantee for positioning,
cutting and multi-colour printing
chromatography of corresponding products; the
gram weight of per unit area of the microporous
polyethylene breathable film is light, thus plastic resin can be used less,
energy consumption is greatly reduced, and carbon emission is reduced, thus providing guarantee for realizing
lightness and emission reduction of one-off living sanitary articles.