PHA-MODIFIED TPS/PBAT BIODEGRADABLE RESIN AND PREPARATION METHOD THEREFOR

摘要

Disclosed is a PHA-modified TPS/PBAT biodegradable resin, comprising the following raw materials in parts by weight: TPS 10-30%; PBAT 20-50%; and PHA 1-30%. Also disclosed is a preparation method of the biodegradable resin. The method involves adding a certain amount of PHA to achieve modification during blending and pelleting TPS and PBAT. PHB is highly compatible with the starch in TPS and the ester in PBAT and can evenly combine with TPS and PBAT under the shearing action of a twin screw. With the addition of PHA, the resulting TPS/PBAT biodegradable resin improves substantially in mechanical properties, with an improvement of more than 20%. Further, as a material produced from natural plant materials by biofermentation processes, PHA can substantially increase the biomass content of the blend, allowing the blend to be more easily degradable. Moreover, as PHA has excellent thermal insulation and waterproof performance, increased water resistance is effected in a film prepared from the TPS/PBAT biodegradable resin added with PHA.