A quick-drying print and environmental-friendly biaxially orientated polypropylene synthetic paper is produced from a polypropylene resin composition comprising a high crystalline polypropylene resin, calcium carbonate composite particles, titanium dioxide composite particles, antistatic agents, UV absorbers and anti-blocking agent, which are fed into one twin-screw primary extruder and two twin-screw secondary extruders respectively, convergently flowed through the same T-die, co-extruded into a three-layer structure substrate film, after cooling and setting, this film is first longitudinally orientated, then laterally orientated; thereafter the three-layer film is high-frequency corona treated and winded up to gain the film having thickness less than 250um . At the end, the three-layer film has coated a thickness below 10 um with a water-based paper-like surface processing agent containing acrylic resin, calcium carbonate, clay, titanium dioxide, water, antistatic agent via a gravure coating roller to acquire an improved synthetic paper having a better printability.
FIELD OF THE INVENTION
The present invention relates to a quick-drying print and environmental-friendly biaxially orientated polypropylene (BOPP) synthetic paper, in particular, aims at that two different polypropylene resin composite materials, processed with one twin-screw primary extruder and two twin-screw secondary extruders respectively and then co-extruded through the same T-die to prepare a substrate film with a three-layer structure, through cooling and setting, biaxial orientation, and then coated with a non-toxic water-based primer, finally coated with a paper-like surface processing agent to become a polypropylene synthetic paper.
