Preparation method of pH response type multi-scale structure polyvinylidene fluoride nanofiber membrane
A technology of polyvinylidene fluoride and nanofiber membranes, which is applied in non-woven fabrics, textiles and papermaking, etc., can solve the problems of polyvinylidene fluoride microfiltration membranes, structural limitations of liquid filtration accuracy and retention rate, etc., and achieve equipment Simple, convenient operation, process controllable effect
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[0023] Example 1:
[0024] (1) Configuration of PVdF solution: Take 1.2096g of PVdF powder, add 9mL of DMF, stir at 35°C to dissolve it completely, and prepare a PVDF solution with a mass fraction of 10%;
[0025] (2) Solution maturation: After the PVdF powder is completely dissolved, add 0.0968g of polyvinyl polyamine (PVdF powder mass 8%), heat and stir and mature in an oil bath at 40°C for 24h;
[0026] (3) Graft copolymerization with acrylic acid: Add 0.2419g acrylic acid (20% of the mass of PVdF powder) and 0.0242g potassium persulfate (2% of the mass of PVdF powder) into the spinning solution of the previous step, and heat to 50℃ to dissolve After it is uniform, the temperature is increased to 70°C to initiate the reaction h;
[0027] (4) Electrospinning: After the reaction in the previous step, the temperature is reduced to 30°C, 2.25mL of acetone (1 / 4 of the volume of DMF), 0.0605g of tetrabutylammonium bromide (5% of the mass of PVdF powder) are added, After being fully diss...
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[0028] Example 2:
[0029] (1) Same as Example 1;
[0030] (2) Solution maturation: After the PVdF powder is completely dissolved, add 0.1310g of polyethylene polyamine (PVdF powder mass 10%), heat and stir and mature in an oil bath at 50°C for 24h;
[0031] (3) Graft copolymerization with acrylic acid: Add 0.1310g acrylic acid (10% of the mass of PVdF powder) and 0.036g potassium persulfate (3% of the mass of PVdF powder) into the spinning solution of the previous step, and heat to 55℃ to dissolve When it is uniform, the temperature is raised to 75°C to initiate the reaction for 3 hours;
[0032] (4) Electrospinning: After the reaction in the previous step, cool to 40°C, add 3 mL of acetone (1 / 3 of the volume of DMF), 0.1310g of tetrabutylammonium bromide (10% of the mass of PVdF powder), and wait After being fully dissolved, the electrospinning method is used for spinning, the spinning voltage is 35kV, the receiving distance is 20cm, and the liquid supply rate is 0.5ml / h to prepare...
Example Embodiment
[0033] Example 3:
[0034] (1) Configuration of PVdF solution: Take 2.073g of PVdF powder, add 9mL of DMF, stir at 40°C to dissolve it completely, and prepare a 16% mass fraction of PVDF solution;
[0035] (2) Solution maturation: After the PVdF powder is completely dissolved, add 0.2073g of polyvinyl polyamine (10% of the mass of the PVdF powder), heat and stir and mature in an oil bath at 55°C for 24 hours;
[0036] (3) Graft copolymerization with acrylic acid: Add 0.2073g of acrylic acid (10% of the mass of PVdF powder) and 0.0622g of potassium persulfate (3% of the mass of PVdF powder) into the spinning solution of the previous step, and heat to 55°C , After dissolving to uniformity, the temperature is raised to 75℃ to initiate the reaction for 3h;
[0037] (4) Electrospinning: After the reaction in the previous step, the temperature is lowered to 40°C, 3mL of acetone (1 / 3 of the volume of DMF), 0.3110g of tetrabutylammonium bromide (15% of the mass of PVdF powder) are added, and ...
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