Polyolefin filtration membrane and preparation method therefor

Abstract

Provided are a polyolefin filtration membrane and a preparation method therefor. The polyolefin filtration membrane includes a main body, both sides of the main body are provided with a first outer surface and a second outer surface, a non-directional tortuous pathway is formed in the main body, and a space between the first outer surface and the second outer surface is composed of continuous fibers. A PMI average pore size of the filtration membrane is 2-100 nm, the filtration membrane has an oxygen-to-carbon ratio in the range from 0.01 to 0.10. High-precision interception and removal of metal particles in a fluid to be filtered, micro-colloidal particles related to metal particles in photoresist, can be achieved through the cooperation between the interception effect of the PMI pore size on the metal particles and the adsorption effect of oxygen-containing functional groups of modified polyolefin molecular chains on the metal particles.

Dependencies are inferred from the claim text.