WATER SOLUBLE POLYMER MODIFIED MICROPOROUS POLYOLEFIN SEPARATOR, PREPARATION METHOD AND USE THEREOF

摘要

Microporous polyolefin membrane modified by aqueous polymer of the invention is obtained by the following steps: copolymerizing 100 parts of a water-soluble polymer, 30-500 parts of a hydrophobic monomer, 0-200 parts of a hydrophilic monomer and 1-5 parts of an initiator into polymeric colloid emulsion; adding 0-100% of an inorganic filler and 20-100% of a plasticizer based on 100% solid content of the polymeric colloid emulsion to obtain slurry; and coating the slurry on one or two surfaces of the surface modified microporous polyolefin membrane and then drying. The microporous polyolefin membrane modified by aqueous polymer has thermal shutdown effect and little thermal shrinkage, and improves the main problem of shrinkage of the microporous polyolefin membrane at high temperature.