The invention provides a preparation method of a high-transparency easy-to-tear
polylactic acid blow-molded film. The high-transparency easy-to-tear
polylactic acid blow-molded film is composed of a mixture of
polylactic acid (PLA), polyterephthalic acid-
adipic acid-
butanediol ester (PBAT), a
plasticizer acetyl
tributyl citrate, a
lubricant ethylene bisstearamide, an opening agent
erucyl amide anda nucleating agent white
carbon black. The preparation method comprises the following steps: weighing PLA, PBAT, a
plasticizer, a
lubricant, an opening agent and a nucleating agent in proportion, adding into a mixer, uniformly mixing, adding from a feeding hole of a double-screw extruder, carrying out
melt extrusion,
water cooling,
pelletizing and
drying to obtain special modified polylactic acidfilm-blowing resin, and carrying out
water cooling blow molding film formation by a
film blowing machine through a down-blowing method to obtain the high-transparency easily-torn polylactic acid blow-molded film. According to the invention, the PBAT, the
plasticizer, the
lubricant, the opening agent and the nucleating agent have a synergistic effect, so that the tensile elongation at break of thepolylactic acid film can be effectively improved, the polylactic acid film has high transparency, the flat
wrinkle-free easy-to-tear high-transparency complete biodegradable film is obtained, the tensile strength is as high as 54.6 MPa, and when the thickness of the film is 0.025 mm, the light
transmittance reaches 94% or above and the
haze reaches 5.3%; and the film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and other films.