The application discloses a kind of multilayer co-
extrusion casting film with one-way wet function and preparation method thereof, belong to layered
film material technical field, its technical scheme main point is multilayer co-
extrusion casting film, by outer layer hydrophilic layer, intermediate
transition layer and inner layer hydrophobic layer is composed, the aperture from outer layer to inner layer decreases in turn, wherein, inner layer mixture is LDPE, LLDPE, modified
calcium carbonate, nano
calcium carbonate,
processing aid;Intermediate layer mixture is HDPE, POE, modified
calcium carbonate, outer layer mixture is mLLDPE, PP, PEG, modified
calcium carbonate, opening agent, the above three kinds of mixture are sent into three different feed ports respectively,
extrusion, stretching, cooling, post-
processing or functionalization by extruder are obtained with one-way wet function multilayer co-extrusion
casting film.By multilayer co-extrusion method, hydrophobic-hydrophilic
wetting gradient and aperture gradient are constructed, process is simple, with excellent
moisture transfer rate and durability.