Bead-like nanofiber fuel filter membrane and preparation method thereof

Abstract

The invention relates to a bead-like nanofiber fuel filter membrane and a preparation method thereof. The preparation method comprises the following steps of firstly, adding a non-solvent into a polymer solution to obtain a microgel polymer solution; then putting an electrospun fiber membrane into the microgel polymer solution for dipping, taking out the electrospun fiber membrane, putting the electrospun fiber membrane into an ultrasonic-assisted non-solvent coagulating bath, and increasing Rayleigh instability in a polymer impregnation liquid phase separation process by utilizing ultrasonic waves, thereby preparing a bead-like nanofiber membrane; then making the bead-like nanofiber membrane subjected to hydrophobic treatment; and finally preparing the bead-like nanofiber fuel filter membrane. In the prepared bead-like nanofiber fuel filter membrane, the average particle size of beads is 20-1000 nm, the hydrophobic angle of the filter membrane is 110-160 degrees, the rolling angle is less than or equal to 10 degrees, the average pore size is 200-1000 nm, and the porosity is 80-95%. The method is simple and easy to implement, the roughness of the surface and the pore channel wall of the prepared filter membrane is remarkably increased, the pore diameter is reduced, meanwhile, high porosity is still kept, and high-precision and high-flux filtration of submicron emulsified water in fuel is facilitated.

Description

technical field [0001] The invention belongs to the technical field of fiber materials, and relates to a beaded nanofiber fuel filter membrane and a preparation method thereof. Background technique [0002] The current fuel filter paper is mostly hydrophobically modified cellulose filter paper, which generally has the defects of large pore size and low separation accuracy. Due to the advantages of fine fiber diameter, small pore size, high porosity, and good pore connectivity, electrospun nanofibrous membranes have shown broad application prospects in the field of filtration and separation. However, at present, the average pore size of conventional electrospun nanofiber membranes is more than 1 μm, and it is difficult to achieve effective separation of submicron emulsified water. [0003] By constructing a hydrophobic multi-level rough structure, the pore size of the electrospun fiber membrane can be reduced and the selective wettability of the fiber membrane interface can ...

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Problems solved by technology

Document [Superhydrophobic and superoleophillic surface of porous beaded electrospunpolystrene and polysytrene-zeolite fiber for crude oil-water separation[J].Physics and Chemistry of the Earth, Parts A / B / C,2016,92:7-13.] published A technology that uses electrospinning technology to prepare beaded nanofiber filter membranes, but the beaded particle size prepared by this technology is in the micron range (>50 μm), and it is impossible to obtain nano-sized beaded beads

The literature [Taro leaf-inspired and superwettable nanonet-covered nanofibrous membranes for high-efficiency oil purification[J].Nanoscale Horizons,2019,4(5):1174-1184.] discloses a conventional electrospinning as the substrate, Further use high molecular weight and low viscosity polymer solution electrospinning to prepare ultrafine fiber / microsphere composite fuel filter membrane with rough structure, but the technical process is long and the size of microspheres is mostly above 1 μm, resulting in ultrafine fiber / microsphere deposition When the thickness reaches 5 μm, the average pore size of the filter membrane is still ~0.6 μm. At the same time, the rough structure of the material only exists in the surface functional layer and there is no rough structure in the pores of the bottom electrospun substrate, which seriously limits the further improvement of the filtration accuracy of the material. promote

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