Method for preparing polylactic acid super-hydrophobic membranes by aid of phase separation process

The invention discloses a method for preparing polylactic acid super-hydrophobic membranes by the aid of a phase separation process, and belongs to the field of high-polymer materials. The method includes steps of (1), preparing pre-coating liquid, to be more specific, uniformly mixing poor solvents and good solvents with one another to prepare mixed solvents, and dissolving polylactic acid in the mixed solvents to obtain the pre-coating liquid; (2), preparing coating liquid, to be more specific, adding poor solvents in the pre-coating liquid, and uniformly stirring the poor solvents and the pre-coating liquid to obtain the coating liquid; (3), carrying smearing and drying, to be more specific, smearing the coating liquid on carriers, and drying the carriers to obtain the polylactic acid super-hydrophobic membranes. The method has the advantages that super-hydrophobic surfaces with micrometer-nanometer two-level structures are prepared by the aid of the non-solvent auxiliary process at one step, the method is easy to operate, conditions are mild, curing and steam inducing can be omitted in membrane forming procedures, gel procedures can be omitted, accordingly, the reaction time can be shortened, and the method is high in work efficiency; inorganic nanometer particles or substances with low surface energy can be omitted in super-hydrophobic membrane preparing procedures, and accordingly the polylactic acid super-hydrophobic membranes are low in manufacturing cost.