Method for preparing low-temperature sintered polytetrafluoroethylene hollow fiber membrane
A polytetrafluoroethylene, low temperature sintering technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problem of low filtration flux and bonding strength, PTFE hollow fiber membrane filtration flux and bonding The problem of high strength, to achieve the effect of high filtration flux and bond strength
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Embodiment 1
[0018] Example 1: A preparation method of low-temperature sintered polytetrafluoroethylene hollow fiber membrane, including the following steps: (1) A biaxially stretched polytetrafluoroethylene flat plate with an average pore diameter range of 0.05 μm -0.5 μm and a thickness of 5 μm -50 μm The film is cut into polytetrafluoroethylene strip film; (2) the polytetrafluoroethylene strip film is immersed in the thermoplastic fluororesin dispersion; (3) the impregnated polytetrafluoroethylene strip film is wrapped in the average The pore size range is 1μm -5μm on the outer wall of the stretched polytetrafluoroethylene hollow fiber membrane, wrapped 1-3 layers, and then heat-treated at 190℃-270 ℃, the heat treatment time is 5 seconds-30 seconds, to obtain wrapped PTFE Ethylene hollow fiber membrane. The biaxially oriented PTFE flat film is cut into PTFE tape with a width of 5 mm -15 mm. The thermoplastic fluororesin is polychlorotrifluoroethylene (PCTFE), copolymer of tetrafluoroeth...
Embodiment 2
[0020] Example 2: A method for preparing a low-temperature sintered polytetrafluoroethylene hollow fiber membrane, including the following steps: (1) Slitting: dividing a biaxially stretched polytetrafluoroethylene flat membrane with an average pore size range of 0.05 μm and a thickness of 50 μm Cut into a PTFE ribbon film with a width of 5 mm; (2) Dipping: immerse the PTFE ribbon film in a thermoplastic fluororesin dispersion, the thermoplastic fluororesin is polychlorotrifluoroethylene (PCTFE), The mass fraction is 10%, the melt index is 5 g / 10min, and the mass ratio of the amount of chlorotrifluoroethylene coated on the polytetrafluoroethylene tape film to the polytetrafluoroethylene tape film is 2:100; (3) Wrapping and shaping: select a stretched PTFE hollow fiber membrane with an average pore diameter of 1 μm, a porosity of 50%, and an inner and outer diameter of 0.5 mm and 1 mm, respectively. The impregnated PTFE The ribbon film is wrapped on the outer wall of the stretch...
Embodiment 3
[0021] Example 3: A method for preparing low-temperature sintered polytetrafluoroethylene hollow fiber membranes, including the following steps: (1) Slitting: dividing a biaxially stretched polytetrafluoroethylene flat membrane with an average pore size range of 0.5 μm and a thickness of 5 μm Cut into a polytetrafluoroethylene strip film with a width of 15mm; (2) Dipping: impregnate the polytetrafluoroethylene strip film in a thermoplastic fluororesin dispersion, which is a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP), the mass fraction of which is 50%, the melt index is 50 g / 10min, and the mass ratio of the amount of chlorotrifluoroethylene coated on the polytetrafluoroethylene ribbon film to the mass of the polytetrafluoroethylene ribbon film is controlled as 20:100; (3) Wrapping and shaping: select stretched polytetrafluoroethylene hollow fiber membrane, with an average pore diameter of 5μm, a porosity of 80%, and inner and outer diameters of 2mm and 3 mm, r...
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