• 专利标题:   Preparing multilayer polytetrafluoroethylene hollow fiber film comprises preparing polytetrafluoroethylene material, pressing into blank, extruding, stretching and sintering the hollow pipe, dipping the film in coating dipping liquid, and sintering at low temperature.
  • 专利号:   CN113680217-A
  • 发明人:   CHEN W
  • 专利权人:   YANGZHONG FUDA INSULATION ELECTRIC APPLI
  • 国际专利分类:   B01D067/00, B01D069/08, B01D071/36, B01J020/26, B01J020/28, B01J020/30, C02F001/28, C02F001/44
  • 专利详细信息:   CN113680217-A 23 Nov 2021 B01D-067/00 202242 Chinese
  • 申请详细信息:   CN113680217-A CN11037268 06 Sep 2021
  • 优先权号:   CN11037268

▎ 摘  要

NOVELTY - Preparing multilayer polytetrafluoroethylene hollow fiber film comprises (i) mixing polytetrafluoroethylene dispersion resin, extrusion aid, nano-silica, nano-graphene, coupling agent, aramid fiber and glass fiber to form polytetrafluoroethylene material; (ii) pressing polytetrafluoroethylene material into blank, extruding the blank to form a polytetrafluoroethylene hollow pipe, stretching and sintering the hollow pipe at low temperature of 150-160degreesC for 30-40 seconds to obtain polytetrafluoroethylene hollow fiber film; (iii) diluting polytetrafluoroethylene dispersion resin with purified water and ethanol to obtain coating dipping liquid, dipping the film in the coating dipping liquid, sintering at low temperature of 150-160degreesC for 20-30 seconds, repeatedly dipping and sintering for multiple times to obtain processed polytetrafluoroethylene hollow fiber film; and (iv) processing the hollow fiber film in mixed solution of hydrophilic stabilizer and ethanol, and drying. USE - The method is useful for preparing multilayer polytetrafluoroethylene hollow fiber film. ADVANTAGE - The multi-layer polytetrafluoroethylene hollow fiber film has excellent anti-fouling and high-flux performance.