Patent ID: 9705118
Date: 2017-07-11
CPC Classifications: B32B,H01M,Y02E,Y10T

Claim:
1. A method for preparing a membrane separator of a battery, comprising the steps of: separately drawing a first polypropylene film and a second polypropylene film in one direction at −3-7° C., and maintaining the films at 45-60° C. to provide a first polypropylene microporous film and a second polypropylene microporous film; perpendicularly compounding the first polypropylene microporous film and the second polypropylene microporous film along the drawing direction to provide a polypropylene microporous composite film; and subjecting the polypropylene microporous composite film to hydrophilic treatment to provide the membrane separator of the battery by soaking the polypropylene microporous composite film in a treating solution for the membrane separator of the battery for 1-5 hours, and drying, wherein the treating solution for the membrane separator of the battery comprises the following components by weight percentage: 1.85 wt %-2 wt % fluoro-carbon surfactant; 1.3 wt %-1.5 wt % leveling agent; 1.4 wt %-1.7 wt % non-ion surfactant; and 95 wt %-95.4 wt % water.