Nanofiber filter membrane, nanofiber composite filter membrane and preparation method thereof
A nanofiber and composite filtration technology, which is applied in separation methods, filtration separation, membrane filters, etc., can solve the problems of low filtration efficiency, high air resistance, and short service life of filtration membranes, and achieve excellent comprehensive filtration performance and long service life. The effect of lifespan and wide application value
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[0044] According to the preparation method of the nanofiber filter membrane of the exemplary embodiment, the nanofiber composite filter membrane is prepared by (coaxial) electrospinning equipment, comprising the following steps: dissolving the polymer in the first solvent to obtain a polymer spinning solution, The first solvent is composed of at least two solvents, and at least one solvent with a boiling point lower than 60°C is included in the first solvent; the polymer spinning solution is injected into the outer tube of the coaxial spinneret, and the gas or the second solvent is sent to into the inner tube of the coaxial spinneret for coaxial electrospinning; the spun nanofibers are directly deposited on the receiving electrode plate to form the nanofiber filter membrane of the present invention.
[0045] The method for preparing a nanofiber composite filter membrane according to an exemplary embodiment uses an electrospinning device to prepare a nanofiber composite filter m...
example 1
[0060] The polylactic acid (PLLA) was vacuum-dried in a vacuum oven at 60°C for 10 hours. Dissolve the dried polylactic acid particles in a mixed solvent, the solvent composition is N,N-dimethylacetamide:dichloromethane=1:7 (volume ratio), and then place it on a magnetic stirrer and stir for 10 hours , forming a homogeneous solution with a mass fraction of 8% as the cortex spinning solution.
[0061] The above-mentioned cortex spinning solution is injected into the coaxial, injected into the outer tube of the coaxial spinneret, and air is passed into the inner tube, and the coaxial electrospinning is carried out at a temperature of 23° C. and a humidity of 50%. The parameters of the spinning process are: the specification of the inner tube is 1.0 / 1.2mm (inner diameter / outer diameter), and the specification of the outer tube is 2.0 / 2.6mm (inner diameter / outer diameter). The flow rate of air in the inner tube is 0.5mL / h, the flow rate of solution in the outer tube is 1.0mL / h, t...
example 2
[0064] The cellulose acetate (CA) was vacuum-dried in a vacuum oven at 60° C. for 10 hours. Dissolve the dried polylactic acid particles in a mixed solvent, and the solvent composition is acetone:dichloromethane=1:5 (volume ratio), and then it is placed on a magnetic stirrer and stirred for 10 hours to form a uniform solution. The mass fraction of 7% is used as the cortex spinning solution.
[0065] The above-mentioned cortex spinning solution is injected into the coaxial, injected into the outer tube of the coaxial spinneret, and air is passed into the inner tube, and the coaxial electrospinning is carried out at a temperature of 23° C. and a humidity of 50%. The parameters of the spinning process are: the specification of the inner tube is 1.0 / 1.2mm (inner diameter / outer diameter), and the specification of the outer tube is 2.0 / 2.6mm (inner diameter / outer diameter). The flow rate of air in the inner tube is 0.5mL / h, the flow rate of solution in the outer tube is 1.0mL / h, th...
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