A kind of hydrophilic modified hollow fiber membrane and preparation method thereof
A technology of hydrophilic modification and fiber membrane, which is applied in the field of membrane separation, can solve the problems of low durability of modification effect and low loading capacity of hydrophilic modification, and achieve the goal of increasing loading capacity and binding strength, and improving modification effect Effect
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Embodiment 1
[0036] The first step, the preparation of casting solution: according to the weight percentage, get the following raw materials: PVDF 20%, PVP 18%, calcium chloride 6%, positive polymer material polyhydroxypropyl dimethyl ammonium chloride 2.5%, Dimethylacetamide 53.5%; after mixing, heat up to 55°C and stir evenly, then perform defoaming treatment to obtain casting solution;
[0037] Step 2, preparation of modified titanium oxide nanoparticles: prepare ethanol suspension containing 1wt% nano-titanium oxide powder, under nitrogen protection conditions, dropwise add ethanol solution containing 1wt% p-hydroxybenzoic acid, ethanol suspension The weight ratio with ethanol solution is 1:2, and the reaction is carried out. The temperature of the reaction process is 20°C, and the reaction time is 10h. After the reaction is completed, the product is filtered out, washed with ethanol and deionized water in turn, and dried under reduced pressure to obtain Modified titanium oxide nanopar...
Embodiment 2
[0042] The first step, the preparation of the casting solution: according to the weight percentage, take the following raw materials: PVDF 28%, PVP 20%, magnesium chloride 6%, positive polymer material polyhydroxypropyl dimethyl ammonium chloride 1%, dimethyl Acetamide 45%; after mixing, heat up to 75°C and stir evenly, then perform defoaming treatment to obtain casting solution;
[0043] The 2nd step, the preparation of modified titanium oxide nanoparticles: prepare the ethanol suspension containing the nano titanium oxide powder of 3wt%, under the condition of nitrogen protection, drop the ethanol solution containing 5wt% p-hydroxybenzoic acid, ethanol suspension The weight ratio with the ethanol solution is 1: 3, and the reaction is carried out. The temperature of the reaction process is 35°C, and the reaction time is 20h. After the reaction is completed, the product is filtered out, washed with ethanol and deionized water in turn, and dried under reduced pressure to obtain ...
Embodiment 3
[0048] The first step, the preparation of casting solution: according to the weight percentage, get the following raw materials: PVDF 25%, PVP 20%, PEG-600 4%, positive polymer material polyhydroxypropyl dimethyl ammonium chloride 2%, Dimethylacetamide 49%; after mixing, heat up to 60°C and stir evenly, then perform defoaming treatment to obtain casting solution;
[0049] The 2nd step, the preparation step of modified titanium oxide nanoparticles comprises the following steps: preparation contains the ethanol suspension of the nanometer titanium oxide powder of 2wt%, under nitrogen protection condition, drips the ethanol solution containing 3wt% p-hydroxybenzoic acid , the weight ratio of ethanol suspension and ethanol solution is 1:2, and the reaction is carried out. The temperature of the reaction process is 25°C, and the reaction time is 14h. After drying, modified titanium oxide nanoparticles are obtained.
[0050] The 3rd step, the preparation of coagulation bath: prepar...
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