Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof
An anti-pollution, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced separation efficiency, poor hydrophilicity, easy pollution, etc., and achieve improved mechanical strength, strong resistance Pollution ability, effect of improving hydrophilicity
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[0026] Example 1:
[0027] 1. Prepare materials according to the following weight ratio:
[0028]
[0029] 2. Preparation of ultrafiltration membrane:
[0030] 1) Raw material drying:
[0031] The above raw materials (except for solvents) are dried in a hot air oven at 105°C for use.
[0032] 2) Preparation of polyvinylidene fluoride-nanocellulose crystal-LiCl mixture
[0033] Add the dried polyvinylidene fluoride to the solvent, stir to completely dissolve the polyvinylidene fluoride, then add nano cellulose crystals, continue to stir to dissolve, continue to add LiCl, fully stir evenly, to obtain polyvinylidene fluoride-nano Cellulose crystal-LiCl mixture.
[0034] 3) Degassing of casting liquid
[0035] Put the polyvinylidene fluoride-nanocellulose crystals-LiCl mixture in a double-layer vacuum barrel, use a vacuum pump to decompress and degas the vacuum barrel, and pass water or oil with a controlled temperature between the double-layer vacuum barrel. , Adjust the appropriate tempera...
Example Embodiment
[0043] Example 2:
[0044] 1) Prepare materials according to the following weight ratio:
[0045]
[0046] The formula and process steps for preparing the film in this example are the same as those in Example 1, except that the formula of the casting solution is changed from that described in Example 1.
[0047] The performance indexes of the polyvinylidene fluoride composite ultrafiltration membrane prepared in this example are shown in Table 1.
Example Embodiment
[0048] Example 3:
[0049] 1) Prepare materials according to the following weight ratio:
[0050]
[0051] The formula and process steps for preparing the film in this example are the same as those in Example 1, except that the formula of the casting solution is changed from that described in Example 1.
[0052] The performance indexes of the polyvinylidene fluoride composite ultrafiltration membrane prepared in this example are shown in Table 1.
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