Preparation method of polytetrafluoroethylene superfine fiber porous membrane
A polytetrafluoroethylene and ultra-fine fiber technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex production process, many influencing factors, large melt viscosity, etc. , the effect of short process and high porosity
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Embodiment 1
[0027] Dissolve 1.56g of polyvinyl alcohol in 12.37ml of water at 90°C, then mix evenly with 6.07g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 70:30 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micrometering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 15cm, the liquid flow rate is 0.01ml / min, and the voltage is 15kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite superfine fiber porous membrane is observed with a scanning electron microscope (see attached figure 1 ). The obtained composite microfiber porous membrane was sintered at a temperature of 390° C. for 2 min to remove polyvinyl alcohol to obtain a brown polytetrafluoroethylene ultrafine fiber porous membrane, which was obse...
Embodiment 2
[0029] Dissolve 2.2g of polyvinyl alcohol in 14.13ml of water at 90°C, then mix evenly with 3.67g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 50:50 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micrometering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 15cm, the liquid flow rate is 0.01ml / min, and the voltage is 15kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite microfiber porous membrane. The obtained composite ultrafine fiber porous membrane was sintered at a temperature of 390° C. for 2 minutes to remove polyvinyl alcohol to obtain a brown polytetrafluoroethylene ultrafine fiber ene porous membrane.
Embodiment 3
[0031] Dissolve 1.56g of polyvinyl alcohol in 12.37ml of water at 90°C, then mix evenly with 6.07g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 70:30 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micro-metering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 14cm, the liquid flow rate is 0.008ml / min, and the voltage is 17kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite microfiber porous membrane. The obtained composite ultrafine fiber porous membrane was sintered at a temperature of 390° C. for 2 minutes to remove polyvinyl alcohol, and a brown polytetrafluoroethylene ultrafine fiber porous membrane was obtained.
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