Preparation method of in-situ synthesized nano silver modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane
An in-situ synthesis, nano-silver technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy aggregation of nanoparticles and ineffective improvement of anti-pollution performance of PVDF ultrafiltration membranes, etc. Achieve the effects of enhancing hydrophilicity and antibacterial properties, increasing water flux, and increasing hydrophilicity
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specific Embodiment approach 1
[0027] Specific embodiment one: this embodiment is a kind of preparation method of in-situ synthesis nano-silver modified PVDF ultrafiltration membrane, specifically completes according to the following steps:
[0028] 1. Preparation of PVDF solution: Mix PVDF powder with dispersing solvent Ⅰ, stir at a stirring speed of 400r / min-600r / min and a temperature of 50°C-60°C for 4h-6h to obtain a PVDF solution;
[0029] The mass ratio of PVDF powder and dispersion solvent I described in step 1 is 16:(70~100);
[0030] 2. Preparation of mixed solution containing nano-silver: AgNO 3 Dissolve in dispersing solvent II, then add porogen, and then ultrasonically disperse at a power of 50W-550W for 60min-120min to obtain a mixed solution containing nano-silver;
[0031] AgNO as described in step 2 3 The mass of dispersing solvent II is 1:(10~50);
[0032] AgNO as described in step 2 3 The mass ratio to porogen is 1:(0.5~3);
[0033] 3. Preparation of casting solution: at a stirring sp...
specific Embodiment approach 2
[0045] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the dispersing solvent I described in step 1 is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl -2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as in the first embodiment.
specific Embodiment approach 3
[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the dispersion solvent II described in step 2 is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl-2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as those in Embodiment 1 or 2.
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