A kind of preparation method of polyvinylidene fluoride flat microfiltration membrane
A polyvinylidene fluoride and microfiltration membrane technology, applied in the field of membrane separation, can solve problems such as reducing membrane flux, and achieve the effects of increasing water flux, strong anti-pollution ability, and improving hydrophilicity
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Embodiment 1
[0028] The first step, prepare 450ml, 0.5% mass percentage acetic acid solution, add 0.9g commercially available chitosan, obtain the chitosan solution of 2mg / ml, stir, under stirring state, mix 286.2ml, 1.45mg / ml The commercially available sodium polyphosphate solution was slowly added dropwise into the prepared chitosan solution, and the stirring was continued for 2 hours at room temperature to obtain an emulsion. Then freeze-dry under vacuum condition to obtain nano-chitosan.
[0029] In the second step, the nano-chitosan obtained in the first step, commercially available polyvinylidene fluoride and polyvinylpyrrolidone are placed in a vacuum drying oven at 40 to 55°C for 12 hours; Take polyvinylidene fluoride: nano chitosan: polyvinylpyrrolidone: dimethylacetamide (DMAC) = 17%: 1.5%: 3%: 78.5%.
[0030] The third step is to place dimethylacetamide in the Erlenmeyer flask, add nano-chitosan to the dimethylacetamide solvent, stir until uniform, and then add polyvinylpyrroli...
Embodiment 2
[0034] Except the raw material metering of the 2nd step is to measure polyvinylidene fluoride: nano-chitosan: polyvinylpyrrolidone: dimethylacetamide=16%: 1%: 4%: 79% by mass percentage, all the other processes and implementation Example 1 is the same.
[0035] please see figure 2 and figure 1 , by scanning electron microscope observation, the section of the membrane that embodiment 1 and 2 obtains is interpenetrating network junction type, asymmetric structure, and membrane surface pore diameter is 0.2~2 micron (μm). The film thickness was 0.46 millimeters (mm). The static drop contact angle test shows that the contact angle is 64-66°. At 20°C and 0.1MPa pressure, the pure water flux is 203.9-261.3L / m 2 / h, BSA (bovine serum albumin) flux is 85.0-130.7L / m 2 / h, the pure water flux after backwashing is 184.4-248.5L / m 2 / h. The flux recovery rate is 90.4%-95.1%, and the interception rate of BSA molecules reaches 91.3%-96.5%.
[0036] It should be particularly noted tha...
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