Method for preparing lasting super-hydrophobic modified polypropylene hollow fiber membrane
A technology of superhydrophobic modification and polypropylene membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problem of loss of carbon dioxide removal function of membrane pores, and achieve low cost, high water pressure resistance, The effect of simple process
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[0021] A preparation method of durable superhydrophobic modified polypropylene hollow fiber membrane, including the following steps:
[0022] (1) Dissolve the fluoroester containing unsaturated double bonds and the acrylate containing long alkyl chain, dithiol and photoinitiator in ethanol solution to prepare a modified solution;
[0023] (2) The polypropylene film material is placed between the two discharge electrodes of the dielectric barrier discharge, and an inert gas is introduced to perform atmospheric pressure dielectric barrier discharge plasma treatment;
[0024] (3) Soak the polypropylene membrane material treated in step (2) in the modification solution described in step (1), and simultaneously irradiate with ultraviolet light for 1-40 minutes, and finally rinse with deionized water and After drying at room temperature, a superhydrophobic modified polypropylene film material with surface graft polymerization and surface crosslinking modification of fluoroester and acrylic...
Example Embodiment
[0032] Example 1:
[0033] Add (N-methylperfluorohexylsulfonamide) ethyl ester (C 6 F 13 SO 2 N(CH 3 )CH 2 CH 2 OCOCH=CH 2 ), dodecyl acrylate, dithiol, and photoinitiator are mixed and dissolved in an ethanol solution in a concentration ratio of 0.1%, 0.1%, 0.05, and 0.001% to prepare a hydrophobic modifier solution. The polypropylene membrane (membrane pore size is 0.1~0.9mm, the contact angle of the membrane surface is 108.4±1.3 o ) Placed in a normal pressure dielectric barrier discharge plasma equipment, adjust the distance between the two discharge electrodes to 2 cm, pass helium gas during discharge, the gas flow rate is 1 liter / min; the discharge frequency is 10 kHz, and the discharge power is 80 watts , The treatment time is 10 seconds; the plasma-treated polypropylene film is immersed in the hydrophobic modifier solution prepared above, and UV irradiation is performed for 40 minutes. Take it out, wash it with deionized water, and dry it at room temperature to obtain a s...
Example Embodiment
[0034] Example 2:
[0035] Add (N-methylperfluorooctylsulfonamido) ethyl ester (C 8 F 17 SO 2 N(CH 3 )CH 2 CH 2 OCOCH=CH 2 ), tetradecyl acrylate, dithiol, and photoinitiator are mixed and dissolved in ethanol solution at a concentration ratio of 1%, 1%, 0.1%, and 0.005% to prepare a hydrophobic modifier solution. The polypropylene membrane (membrane pore size is 0.1~0.9mm, the contact angle of the membrane surface is 108.4±1.3 o ) Placed in the atmospheric pressure dielectric barrier discharge plasma equipment, adjust the distance between the two discharge electrodes to 1.5 cm, pass helium gas during discharge, the gas flow rate is 0.5 liters / min; the discharge frequency is 10 kHz, and the discharge power is 50 watts , The treatment time is 5 seconds; the plasma-treated polypropylene film is immersed in the hydrophobic modification solution prepared above, and UV irradiation is performed for 40 minutes. Take it out, wash it with deionized water, and dry it at room temperature t...
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