Super-hydrophobic polylactic acid film with durable self-cleaning property and preparation method of super-hydrophobic polylactic acid film

The invention discloses a super-hydrophobic polylactic acid film with durable self-cleaning property and a preparation method thereof, and belongs to the technical field of materials. According to the method, polylactic acid is used as a main material, polymerized rosin is used as a pore-foaming agent, methylbenzene is used as an extracting agent, and the polylactic acid porous membrane is prepared through a non-solvent phase separation method; and then soaking in a hydrophobic substance solution to obtain the super-hydrophobic polylactic acid film. The initial water contact angle of the obtained super-hydrophobic polylactic acid film reaches 150 degrees or above, and the super-hydrophobic polylactic acid film has super-hydrophobicity and a remarkable self-cleaning effect; and after multiple times of friction, the water contact angle of the film is kept at 94% or above, the self-cleaning property is still remarkable, and the film has wide application prospects in the fields of self-cleaning, fluid drag reduct