METHOD FOR PRODUCING HYPERFINE FIBER SYNTHETIC LEATHER WITH DENSITY GRADIENT STRUCTURE

摘要

TECHNICAL FIELD OF THE INVENTION The present invention relates to a technical field of ultra-fine fiber synthetic leather, and more particularly, to a method for producing ultra-fine fiber synthetic leather having a density gradient structure. The process of the present invention uses a solvent-free polyurethane, wherein the solvent-free polyurethane penetrates into the surface of the microfibre nonwoven fabric to form a dense layer, followed by stiffening, weight loss and post-Finally, a dense gradient structure with a dense surface similar to that of natural leather can be created.