| abstract |
The present invention relates to the preparation method of a kind of film, particularly relate to the preparation method of a kind of air filtration polytetrafluoroethylene film.It comprises the following steps: lubrication mixing: mixed with fluid lubricant by the ptfe micropowder that aperture is 0.215～0.225 micron, 3～6 hours are stood at a temperature of 85 DEG C～90 DEG C, make toner and fluid lubricant be sufficiently mixed, form polytetrafluoroethylene (PTFE) material；Base rolls；Degreasing modification: add the auxiliary agent accounting for ptfe micropowder quality 1 3%, polytetrafluoroethylene (PTFE) base band is formed after 200 250 DEG C of longitudinal stretchings 1.5 2.5 times degreasing base band；Drawing and setting: by degreasing base band cross directional stretch at 215 DEG C～235 DEG C, then sinter sizing；Cooling and solidifying.The PM2.5 interception result of polytetrafluoroethylene film prepared by this method is good. |