High-toughness polylactic acid-based biodegradable material and preparation method thereof

The invention relates to a preparation method of a high-toughness polylactic acid-based biodegradable material, and belongs to the field of polymer blending modification. According to the high-toughness polylactic acid-based biodegradable material provided by the preparation method, polylactic acid is taken as a matrix, polymethyl methacrylate is taken as an interfacial compatibilization phase, and the matrix and the polymethyl methacrylate are respectively subjected to melt blending with polycaprolactone, poly (butylene succinate), poly (butylene adipate-co-terephthalate), polyhydroxyalkanoate and poly-beta-hydroxybutyrate, a series of polylactic acid-based biodegradable materials are prepared, wherein the total mass ratio of the polylactic acid and the polymethyl methacrylate in a blending system is 70-90 wt%, the mass ratio of the other flexible degradable component is 10-30 wt%, and biodegradable materials with different mechanical properties are obtained by adjusting the content of the polymethyl methacr