Method for preparing high-efficiency filtration and intelligent antibacterial porous nanofiber membrane
A nanofiber membrane, high-efficiency filtration technology, applied in filtration and separation, fiber treatment, separation methods, etc., can solve the problems of fiber morphology damage, increased process difficulty, and difficulty in industrialized production, achieving low resistance, good filtration effect, The effect of promoting swelling and water absorption
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[0025] Example 1 Preparation of porous nanofiber membrane A
[0026] figure 1 Shown is the SEM image of the porous nanofiber prepared in Example 1.
[0027] PLGA and PCL are dissolved in a mixed solvent of dichloromethane and NN dimethylformamide at a mass ratio of 1:1, and the polymer mass fraction is 10%; NN dimethylformamide accounts for 5% of the mixed solvent mass , Stir thoroughly, then divide into two bottles, add 3% citric acid to one bottle of solution, add 3% sodium chlorite to the other bottle of solution, and stir to make it evenly dispersed. Adding 2% polyvinyl alcohol microspheres to the two solutions is beneficial to promote the expansion and water absorption of nanofibers and accelerate the reaction; then the solution is at a spinning voltage of 30kv, a spinning distance of 12cm, and a microsyringe pump flow rate of 200ml / h, the temperature is 25°C, and the relative humidity is 60% for a period of electrospinning to obtain porous nanofiber membrane A. The average...
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[0028] Example 2 Preparation of porous nanofiber membrane B
[0029] Dissolve PLGA and PCL in dichloromethane according to the mass ratio of 1:2, the polymer mass fraction is 11%, stir well, and then divide into two bottles, add 5% citric acid to the solution of one bottle and the other bottle Add 4% sodium chlorite and stir to make it evenly dispersed. Adding 3% polyvinyl alcohol microspheres to the two solutions is beneficial to promote the expansion and water absorption of nanofibers and accelerate the reaction; then the solution is at a spinning voltage of 40kv, a spinning distance of 15cm, and a microsyringe pump flow rate of 300ml / h, the temperature is 25° C., and the relative humidity is 70% for a period of electrospinning to obtain porous nanofiber membrane B. The average diameter of the porous nanofibers is 700 nm, and the pore size ranges from 80 to 200 nm. The intelligent antibacterial efficiency is 98.5%. At an ambient humidity of 25±2°C and a relative humidity of ...
Example Embodiment
[0030] Example 3 Preparation of porous nanofiber membrane C
[0031] Dissolve PLGA and PCL in dichloromethane and NN dimethylformamide at a mass ratio of 2:1, and the polymer mass fraction is 10%; among them, NN dimethylformamide accounts for 4% of the mixed solvent mass. Stir thoroughly Evenly, then divide into two bottles, add 9% citric acid to the solution in one bottle, add 4% sodium chlorite to the solution in the other bottle, and stir to make it evenly dispersed. Adding 2% polyvinyl alcohol microspheres to the two solutions is beneficial to promote the expansion and water absorption of nanofibers and accelerate the reaction; then the solution is at a spinning voltage of 50kv, a spinning distance of 20cm, and a microsyringe pump flow rate of 500ml / h, the temperature is 25°C, and the relative humidity is 75% for a period of electrospinning to obtain a porous nanofiber membrane C. The average diameter of the porous nanofibers is 300nm, and the pore size ranges from 50-100nm...
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