Polylactic acid modified material, and preparation method and application thereof

The invention provides a polylactic acid modified material, and a preparation method and application thereof. The polylactic acid modified material contains the components in parts by weight: 40 to 70 parts of polylactic acid (one of or a mixture or a copolymer of poly-L-lactic acid, poly-D-lactic acid and poly-DL-lactic acid), 10 to 20 parts of polyester thermoplastic polyurethane, 10 to 20 parts of plasticizer and 10 to 20 parts of organic or inorganic filler, wherein the plasticizer is one or a mixture of two of tributyl acetocitrate, epoxidized soybean oil, polypropylene glycol adipate and dioctyl maleate, and the organic or inorganic filler is one or more than one of starch, talcum powder, calcium carbonate, mica, montmorillonite, clay and titanium dioxide. According to the polylactic acid modified material provided by the invention, the flexibility of a polylactic acid material can be improved and the cost of a biodegradable material is reduced; and the prepared polylactic acid modified material has the tensile strength from 15 to 70MPa and the elongation at break of 20 to 380% which are obviously better than those of like products.