Hydrophilic polyolefin-based composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane and olefin-based membrane technology, which is applied in the field of hydrophilic polyolefin-based composite nanofiltration membrane and its preparation, can solve the problems of poor membrane uniformity, cumbersome operation steps, and long time required to achieve flux retention time Long, wide application range, simple and easy operation
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[0058] Example 1
[0059] The polyethylene (Mn=3×10 6 ) microporous membrane (average pore size 0.058 microns, porosity 47%, thickness 20 microns) was cleaned and dried with isopropyl alcohol, and then immersed in 2wt% polyvinyl alcohol (alcoholysis degree 98%, molecular weight 110000) solution, with 0.5wt% Glutaraldehyde is cross-linked, and the content of the surfactant SDBS in the hydrophilic agent is 10 wt %. After standing for 10 min, it is transferred to the oven to heat, and cross-linked at 70° C. for 10 min. After completion, take out and put in 40wt% ethanol aqueous solution to remove excess hydrophilic agent to obtain a hydrophilic polyethylene microporous membrane.
[0060] The aqueous phase solution containing 2wt% piperazine was poured into the frame of the hydrophilic polyethylene membrane, the content of ethylenediamine in the solution was 1wt%, and the content of precipitated silica was 0.5wt%, taken out after 5min, and extruded with a polyurethane pressing ro...
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[0063] Example 2
[0064] The polyethylene (Mn=6×10 6 ) microporous membrane (average pore size 0.043 microns, porosity 35.4%, thickness 16 microns) was cleaned and dried with isopropanol, and then immersed in 8wt% polyvinyl alcohol (alcoholysis degree 98%, molecular weight 110000) solution, with 0.5wt% Maleic anhydride is cross-linked, and the content of the surfactant sodium polystyrene sulfonate in the hydrophilic agent is 10 wt %. After standing for 10 minutes, it is transferred to an oven to heat, and cross-linked at 70° C. for 20 minutes. After completion, take out and put in 40wt% ethanol aqueous solution to remove excess hydrophilic agent to obtain a hydrophilic polyethylene microporous membrane.
[0065] The aqueous phase solution containing 2wt% piperazine was poured into the frame of the hydrophilic polyethylene membrane, the content of ethylenediamine in the solution was 1wt%, and the content of precipitated silica was 0.5wt%, taken out after 5min, and extruded wi...
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[0068] Example 3
[0069] Adjust the amount of precipitated silica, increase its content to 5wt%, ultrasonic for 10min, increase the interfacial polymerization time to 120s, and other conditions are the same as Example 2.
[0070] The test of Example 3 shows that the pure water flux reaches 126.8L / m2.h per bar, indicating that increasing the amount of precipitated silica has a certain effect on improving the flux, but the rejection rate of sodium chloride is reduced to 36.6%, and the sodium sulfate It is reduced to 87.2%, indicating that the pore size of the formed polyamide skin layer is too large, and defects are formed, resulting in a general decrease in the retention rate.
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