Stereoscopic polylactic acid nano-microsphere reinforced PLLA barrier film and preparation method thereof

The invention belongs to the technical field of barrier film materials, and discloses a stereopolylactic acid nano-microsphere reinforced PLLA barrier film and a preparation method thereof. The preparation method comprises the following steps: dissolving PLLA and PDLA in an organic solvent, blending, separating out stereopolylactic acid nano-microspheres in a non-good solvent, filtering by using a standard sieve, collecting to obtain stereopolylactic acid nano-microspheres, and blending the stereopolylactic acid nano-microspheres with PLLA to prepare the reinforced barrier film. The stereopolylactic acid nano-microsphere has excellent heat resistance and nano-scale effect, and can be used as an excellent modifier and nucleating agent of a polylactic acid barrier film material. The steric polylactic acid nano-microsphere reinforced PLLA barrier film material prepared by the invention has the characteristics of biosafety, degradability and high barrier, and is suitable for packaging materials in multiple fields