Patent ID: 11926711
Assignee: NANJING WURUI BIODEGRADABLE NEW MATERIAL RESEARCH INSTITUTE CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for preparing a thermoplastic starch/polylactic acid/poly(butylene adipate-co-terephthalate) (TPS/PLA/PBAT) blend modified biodegradable resin by using a chain extender, comprising the steps of:
(1) adding a chain extender into an ethyl acetate solution, and stirring until the chain extender is dissolved, wherein the chain extender is styrene, methyl methacrylate and glycidyl methacrylate copolymer;
(2) weighing and mixing TPS granules and PBAT granules, feeding the mixed TPS granules and PBAT granules into a twin-screw extrusion granulator, blending in the twin-screw extrusion granulator in a high-temperature and high-shear manner, extruding the mixed granules out of a die orifice, stretching, air-cooling, and cold-cutting to obtain TPS/PBAT blend modified biodegradable resin granules; and
(3) mixing the TPS/PBAT blend modified biodegradable resin granules obtained in step (2) with PLA granules, spraying the solution obtained in step (1) on a surface of the mixed TPS/PBAT blend granules and PLA granules by a spraying method, feeding the sprayed, mixed TPS/PBAT blend granules and PLA granules into the twin-screw extrusion granulator, blending in the twin-screw extrusion granulator in a high-temperature and high-shear manner, extruding, stretching, and cold-cutting to obtain TPS/PLA/PBAT blend modified biodegradable resin granules.