Preparation of ultrafine polyimide nanofiber membrane at high voltage and use of membrane in high-temperature filtration

Abstract

The present invention discloses preparation of an ultrafine polyimide nanofiber membrane at high voltage and use of the membrane in high-temperature filtration. By using a metal wire needleless-type electrospinning technology, a nanofiber membrane with an average fiber diameter of lower than 130 nm is prepared at a high voltage of 80 kV Such a fine fiber structure not only enhances interception efficiency for fine particulate matter (PM0.3) to achieve a filtration efficiency of above 99.97%, but also significantly reduces filtration resistance to 189.18 Pa through a slip effect, thus having better performance than conventional commercial glass fiber filtration materials. The ultrafine polyimide nanofiber membrane prepared by the present invention has the advantages of high filtration efficiency, low resistance, good thermal stability, and hydrophobicity, thus having a broad application prospect in the field of high-temperature filtration of PM.

Dependencies are inferred from the claim text.