Preparation method of super-hydrophobic PVDF (polyvinylidene fluoride) membrane
A super-hydrophobic, water-bath technology, applied in the field of super-hydrophobic PVDF membrane preparation, can solve membrane wetting and other problems, achieve the effect of alleviating membrane wetting and improving anti-wetting performance
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[0024] Example 1
[0025] Take 8.6ml of polyethylene glycol-400 and add it to 153ml of N-methylpyrrolidone and mix well. Then 36g PVDF was added to the above solution while stirring, stirred for 12 hours under the condition of heating in a water bath at 60°C for 12 hours to completely dissolve, and placed in a vacuum oven at 40°C for 12 hours to defoam to obtain a uniform casting solution; weigh 1g of graphite The alkene is added to 1000 ml of methanol, and after being evenly dispersed, it is added to 2000 ml of deionized water to prepare a coagulation bath. Use a spatula to scrape the casting liquid on the glass plate to prepare a nascent flat membrane, stay in the air for 30 seconds, and then place the nascent flat membrane in the solidification bath prepared above until it solidifies into a PVDF membrane; place the membrane in deionized water Soak for 24 hours, thoroughly remove the solvent remaining in the membrane, and dry at room temperature to obtain the superhydrophobic ...
Example Embodiment
[0026] Example 2
[0027] Take 9.2ml polyethylene glycol-600 and add it to 165ml N,N-dimethylformamide to mix evenly. Then add 40g PVDF to the above solution while stirring, stir for 12h under the condition of heating in a water bath at 60℃ to completely dissolve it, and leave it in a vacuum oven at 40℃ for 12h to defoam to obtain a uniform casting solution; weigh 1g alkane TiO 2 The nanoparticles are added to 1000ml of absolute ethanol, and after being evenly dispersed, they are added to 1000ml of deionized water to prepare a coagulation bath. Use a spatula to scrape the casting liquid on the glass plate to prepare a nascent flat membrane, stay in the air for 30 seconds, and then place the nascent flat membrane in the solidification bath prepared above until it solidifies into a PVDF membrane; place the membrane in deionized water Soak for 24 hours, thoroughly remove the solvent remaining in the membrane, and dry at room temperature to obtain the superhydrophobic PVDF membrane....
Example Embodiment
[0028] Example 3
[0029] Take 8.6ml polyethylene glycol-400 and add it to 153ml N-methylpyrrolidone and mix it evenly. Then 36g PVDF was added to the above solution while stirring, stirred for 12h under the condition of heating in a water bath at 60℃ to completely dissolve it. After degassing in a vacuum oven at 40℃ for 12h, a uniform casting solution was obtained; Weigh 1g of fluorine SiO 2 The nanoparticles are added to 1000ml of N-methylpyrrolidone, and after being evenly dispersed, they are added to 1000ml of deionized water to prepare a coagulation bath. Use a spatula to scrape the casting liquid on the glass plate to prepare a nascent flat membrane, stay in the air for 30 seconds, and then place the nascent flat membrane in the solidification bath prepared above until it solidifies into a PVDF membrane; place the membrane in deionized water Soak for 24 hours, thoroughly remove the solvent remaining in the membrane, and dry at room temperature to obtain the superhydrophobi...
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