Preparation method and device of expanded polytetrafluoroethylene tube membrane and application of expanded polytetrafluoroethylene tube membrane

• Main Authors: ZHU HAILIN, LI CHENGCAI, GUO YUHAI, LIU GUOJIN
• Format: Patent
• Language: Chinese; English
• Published: 08.03.2024
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a preparation method and device of an expanded polytetrafluoroethylene tube membrane and application of the expanded polytetrafluoroethylene tube membrane. The method comprises the following steps: preparing an expanded polytetrafluoroethylene tube blank by a uniaxial stretching method, and extruding the tube blank to obtain a base membrane of which the tube membrane inner wall aperture is smaller than the outer wall aperture; soaking the base membrane in a glucosamine alcohol solution for complete infiltration and then taking out the base membrane; removing the surface solution, soaking in an acyl chloride solution, taking out, and heating for reaction; and then soaking in a glycosaminoglycan quaternary ammonium salt aqueous solution, taking out, fully reacting at a certain temperature, washing and drying to obtain the modified polytetrafluoroethylene tube membrane. According to the preparation method, the pore diameter of the inner wall of the membrane is smaller than that of the out