The invention relates to a process for preparing
polyolefin antibacterial permeability membrane, which consists of mixing 10-30 contents of nanocalcium
carbonate and 10-65 contents of heavy
calcium carbonate first, adding 0.1-10 contents of unsaturated acid
monomer, 0.1-20 contents of long fatty chain
monomer, 0.001-5 contents of initiating agent, 0.1-10 contents of polyethersulphonate and 0.1-20 contents of macromolecular
coupling agent and 5-80 contents of
polyolefin resin, first preparing predisperse
masterbatch of mixed
calcium carbonate in the twin-screw extruder, afterwards, mixing 20-80 contents of predisperse
masterbatch of mixed
calcium carbonate, 0.1-5 contents of hole
leveler, 0.1-0.5 contents of anti-oxidant, 2-20 contents of compound antibacterial mother particle and 20-70 contents of
polyolefin resin in high-speed mixer, squeezing the
prill by twin-screw extruder,
drying and vacuum-packing, obtaining the special material of antibacterial permeability membrane. The invention is characterized in that the interactive condition between the polyolefin and
calcium carbonate is strong, the filling material is readily dispersed in the
polymeric matrix, the special material of permeability membrane can not only form film using doctor-blading process, but also can form film using blowing process, the
pore diameter of the said permeability membrane is uniform, and its antibacterial behavior is excellent.