▎ 摘　　要

NOVELTY - Degradable high-barrier composite film comprises layer structure with at least one of A/B, A/C, A/B/C and A/B/A/C. The layer A is a modified polybutylene terephthalate-adipate copolymer comprises 50-103 pts. wt. polybutylene terephthalate-adipate copolymer, 20-109 pts. wt. thermoplastic starch, 2-10 pts. wt. compatibilizer, 0.5-10 pts. wt. tackifier and 1.5-42 pts. wt. auxiliary materials. The layer B is paper or cellulose film and the layer C is composite material comprises 40-150 pts. wt. fully biodegradable polymer, 12-60 pts. wt. reinforcing filler, 2-16 pts. wt. antistatic agent and 0.1-15 pts. wt. ultraviolet absorber. USE - The degradable high-barrier composite film is useful in packaging field of liquid and fresh food. ADVANTAGE - The degradable high-barrier composite film has good barrier property and high interlayer peeling strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing degradable high-barrier composite film comprises (a) drying starch at 60degrees Celsius for 12-48 hours, taking plasticizer in a ratio of 100:10-40, adding to high-speed mixer to stir for 2-10 minutes, cooling down, adding mixed material to the extruder AT 80-150degrees Celsius at a addition speed of 3-10 revolutions/minute at screw speed of 50-400 revolutions/minute for melting under 2-10 MPa, kneading at a speed of 20-60 revolutions/minute, cooling and pelletizing at a speed of 7-20 revolutions/minute to obtain thermoplastic starch for modified polybutylene terephthalate-adipate copolymer, (b) mixing thermoplastic starch granules in (a), polybutylene terephthalate-adipate copolymer, compatibilizer, tackifier and auxiliary materials, extruding and granulating, blowing into film by an extruder at 80-200degrees Celsius at a speed of 40-200 revolutions/minute to melt, subjecting to plasticize and pressurize, cooling, pulling, trimming and winding to obtain layer A, (c) unwinding layer B above layer A film obtained in step (b), heating layer A and simultaneously passing the layer B via cooling composite roller for stretching and transferring and pressing together by calendering roller to obtain an A/B structure composite film, (d) adding fully biodegradable polymer, reinforcing filler, antistatic agent and UV absorber to the multi-feed extrusion system for melt blending and granulation, placing cooled pellets into the first extruder of the multi-layer compound production line, melting pellets and plasticizing to form a uniform fluid and forming cast film as C layer through a flat mold, (e) stretching and transferring the cast film obtained in (d), placing layer A film obtained from (b) above the cast film, pressing the two together by a calendering roller and obtaining A/C structure composite membrane, (f) unwinding the B layer above the layer cast film obtained in (d) and pressing the two together by a calendering roller to obtain a B/C structure composite film, (g) heating layer A film obtained from (b) and cooling by the composite roller to be stretched and transferring, subjecting B/C composite film obtained form (f) to secondary calendering and compounding to obtain the A/B/C structure composite film, (h) unwinding layer A film obtained from (b) on both sides of the B-layer film, where B-layer film is main unwinding, heating layer A film obtained from (b), stretching and transferring, calendering and compounding with the B-layer film to obtain A/B /A structure composite membrane, (i) subjecting A/B/A composite film obtained in (h) subjected to corona treatment on the A side, stretching material obtained in (d) and transferring to the second pair of heating and cooling composite rolls to obtain A/B/A/C structural composite material by calendering the composite rollers together and (j) rewinding, slitting and packing the materials obtained in the steps (c), (e), (g) and (i) to obtain the degradable high-barrier composite film.