Organic solvent nanofiltration membrane and preparation method thereof

摘要

The present invention relates to a process for producing a heat-converted poly (benzoxazole-imide) copolymer film having a crosslinked structure by a crosslinking reaction and subsequent thermal conversion of an ortho-hydroxypolyimide copolymer film and applying the same to an organic solvent nanofiltration membrane It is about technology that The heat-converted poly (benzoxazole-imide) copolymer organic solvent nanofiltration membrane of crosslinked structure prepared according to the present invention has excellent chemical stability to an organic solvent by controlling the content of the polybenzoxazole structural unit in the copolymer , Organic solvent nano-filtration is excellent and it can be commercialized in chemical industry and pharmaceutical industry.