Recyclable electret filtering membrane and preparation method and cleaning and charge regeneration method thereof
A filter membrane and electret technology, applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of complex operation, ozone generation, inability to remove particulate matter, etc., and achieve good circulation effect
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Embodiment 1
[0039] (1) Accurately weigh 9g of PTFE, 0.2g of polyethylene oxide and 8.7g of deionized water in a 50mL beaker with a balance, and then add a stirrer, stir on a magnetic stirrer for 36h, and configure it into a uniform and stable spinning liquid;
[0040](2) Set the spinning parameters, the parameters are the spinning voltage is 18kV, the bolus speed is 0.06mm / min, the drum speed is 120r / min, and the ambient relative humidity is 60%RH. Electrospinning using spinning fluid is used to obtain a PTFE / VINYL composite filter membrane, such as Figure 1a 、 Figure 2a shown;
[0041] (3) The prepared composite filter membrane was dried at room temperature for 4h, and then calcined at 390 ° C for 10 min to obtain a PTFE filter membrane, such as Figure 1b 、 Figure 2b As shown; due to the presence of polyethylene before calcination, the mass fraction of oxygen elements is 4.64%, and after calcination, polyethylene oxide is removed, so the filter membrane no longer contains oxygen elements. ...
Embodiment 2
[0048](1) Accurately weigh 10.8g perfluoroethylene propylene copolymer with balance, 0.2g polyethylene oxide and 2g deionized water in a 50mL beaker, and then add a stirrer, stir on a magnetic stirrer for 36h, and configure it into a uniform and stable spinning liquid;
[0049] (2) Set the spinning parameters, the parameters are the spinning voltage is 21kV, the bolus speed is 0.06mm / min, the drum speed is 80r / min, and the ambient relative humidity is 60%RH. Preparation of perfluoroethylene propylene copolymer / polyethylene oxide composite filter membrane by electrospinning using textile liquid;
[0050] (3) The prepared composite filter membrane was dried at room temperature for 4h, and then calcined at 300 ° C for 10 min to obtain a perfluoroethylene propylene copolymer filter membrane.
[0051] (4) The perfluoroethylene propylene copolymer filter membrane is corona charged, the voltage is -10kV, the needle-to-ground distance is 3cm, and the charging time is 10min, and the elect...
Embodiment 3
[0056](1) According to steps (1) - (3) in Example 1, prepare a polytetrafluoroethylene fiber filter membrane;
[0057] (2) 0.1g of silica nanoparticles were mixed with 30ml of n-hexane to prepare silica suspended water (named (1)), 1g of Corning 184 polydimethylsiloxane (mixed with a matching curing agent at 10:1) and 10g of n-hexane was mixed to prepare adhesive (named (2)), 1ml (2) of dissolved water was added to (1) dissolved water to obtain new dissolved water (named (3)), and 0.5g of heptadecyclic triethoxysilane, 24.375g of n-hexane and 0.125g of acetate were mixed to obtain a fluorosilane solution (Named (4)); the prepared PTFE fiber filter membrane was soaked in solution (3) for 30 minutes, dried at 60 °C for 1 hour, repeated three times, and then soaked in (4) dissolved water for 30 minutes, dried at 60 °C for 1 hour, repeated three times; finally prepared a surface fluorinated modified PTFE electret filter membrane;
[0058] (3) The surface fluorinated modified PTFE fil...
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