The invention discloses a PBAT full-biodegradable and anti-counterfeiting
plastic bag and a preparation method thereof. The PBAT full-biodegradable and anti-counterfeiting
plastic bag comprises the following components in parts by weight: 100 pars of PBAT and 0.1-20 parts of anti-counterfeiting
masterbatch, wherein the anti-counterfeiting
masterbatch comprises the following components in weight percentage: 27-99.9% of carrier resin, 0.01-15% of fluorescent
powder, 0.01-65% of coding substance and 0-3.25% of additives; and the carrier resin is PBAT. The preparation method comprises the following steps: performing plastic
extrusion on PBAT and the anti-counterfeiting
masterbatch to a co-
extrusion machine head by a large extruder and a small extruder respectively, extruding PBAT from the large extruder, extruding the anti-counterfeiting masterbatch from the small extruder, extruding a double-color bubble tube, and then performing inflation, traction, printing, coiling, bagging and
punching to prepare the PBAT full-biodegradable and anti-counterfeiting
plastic bag. An anti-counterfeiting strip and a PBAT film are fused into a whole by adopting a specific co-
extrusion and film-blowing process, and the
binding force is good; the production process is simple, the anti-counterfeiting cost is low, and the PBAT full-biodegradable and anti-counterfeiting plastic bag is easy to process, form and realize
mass production; the authenticity identification and tracing of the PBAT full-biodegradable and anti-counterfeiting plastic bag are realized according to
fluorescence characteristic and coding information on the anti-counterfeiting strip.