The present invention discloses a low-cost, thermally stable, fully biodegradable plastic and its preparation method. The specific technical features are as follows: Poly(lactic acid), epoxy resin, pretreated starch, and predispersed powder are extruded through a co-rotating parallel twin-screw extruder equipped with four-stage, five-stage, and six-stage continuous compression screw elements to produce a low-cost, thermally stable, fully biodegradable plastic. Low molecular weight poly-β-hydroxybutyrate guides the activity of polylactic acid molecular chains, while epoxy resin serves as a chain extender to promote chain breakage and reconnection, enhancing polylactic acid regularity and increasing crystallinity. Further extending screw compression time not only enhances synergistic effects within the blend system, improving the tensile strength of modified polylactic acid, but also elevates the material's heat resistance, meeting the requirements for end-use products.
Country Code: CN
Application Number: CN202310793093.7
