Modification method of anti-pollution hydrophilic PVDF (polyvinylidene fluoride) membrane
A polyvinylidene fluoride membrane, hydrophilic technology, applied in the field of materials science, can solve the problems of unstable hydrophilic performance, dangerous operation, short life and so on, and achieve stable and durable hydrophilic performance, low cost, and hydrophilic performance. Stable and long-lasting effect
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Embodiment 1
[0026] (1) Pretreatment of PVDF membrane: Soak the PVDF membrane in absolute ethanol and deionized water for 24 hours, take it out and dry it at 80°C;
[0027] (2) Alkaline treatment of PVDF membrane: immerse the PVDF membrane in KOH-water solution with a mass percentage concentration of 48%, treat it at 80°C for 8 hours, take it out, wash it until neutral, and dry it;
[0028] (3) Thermal polymerization grafting: prepare a n-propanol solution containing 7.5wt% acrylic acid and 0.8wt% BPO, immerse the PVDF membrane in it, react at 65°C for 5h, take it out, wash it and dry it;
[0029] (4) Esterification reaction of the grafted membrane: immerse the PVDF-g-AA membrane in PEG (200) with a mass percent concentration of 1% and 1% concentrated hydrochloric acid solution for 2 hours at 75°C, take it out and wash it.
Embodiment 2
[0031] (1) Pretreatment of PVDF membrane: same as step (1) of Example 1;
[0032] (2) Alkaline treatment of PVDF membrane: immerse the PVDF membrane in KOH-ethanol solution with a mass percentage concentration of 5%, treat it at 65°C for 10min, take it out, wash it until neutral, and dry it;
[0033] (3) Thermal polymerization grafting: Prepare a n-propanol solution containing 6.5wt% acrylic acid and 1.2wt% BPO, immerse the PVDF membrane in it, react at 70°C for 3 hours, take it out, wash it and dry it;
[0034] (4) Esterification reaction of the grafted membrane: immerse the PVDF-g-AA membrane in PEG (200) with a mass percent concentration of 4% and 1% benzoic acid solution for 2.5 hours at 80°C, take it out and wash it.
Embodiment 3
[0036] (1) Pretreatment of PVDF membrane: Soak the PVDF membrane in absolute ethanol and deionized water for 36 hours, take it out and dry it at 83°C;
[0037] (2) Lye treatment of PVDF membrane: immerse the PVDF membrane in KOH-ethanol solution with a mass percentage concentration of 10%, treat it at 50°C for 15min, take it out, wash it until neutral, and dry it;
[0038] (3) Thermal polymerization grafting: prepare a n-propanol solution containing 8wt% acrylic acid and 1wt% AIBN, immerse the PVDF membrane in it, react at 55°C for 6h, take it out, wash it and dry it;
[0039] (4) Esterification reaction of the grafted membrane: immerse the PVDF-g-AA membrane in a solution of 1% PVA and 1% benzoic acid by mass percentage and react at 80°C for 3 hours, then take it out and wash it.
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