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Four-layer composite micro-nano fibrous air filtration membrane and application thereof

A technology of micro-nano fiber and air filtration, which is applied in the direction of dispersed particle filtration, membrane, membrane technology, etc. It can solve the problems of excessively dense accumulation of fiber membranes, high wind resistance of filter membranes, and high cost of use, and achieve simple production process and high filtration wind resistance. The effect of low cost and simple installation

Pending Publication Date: 2018-12-18
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the simple use of nanofibrous materials may easily cause problems such as excessively dense fiber membranes and low porosity.
This makes the wind resistance of the filter membrane too large during use, and the cost of use increases

Method used

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  • Four-layer composite micro-nano fibrous air filtration membrane and application thereof
  • Four-layer composite micro-nano fibrous air filtration membrane and application thereof
  • Four-layer composite micro-nano fibrous air filtration membrane and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027]Weigh a certain amount of dry polyurethane particles with an electronic balance and dissolve them in a mixed solvent of N,N-dimethylformamide and tetrahydrofuran with a volume ratio of 3:1, and place it on a magnetic stirrer to stir for 6 hours to obtain the mass fraction It is a 15% polyurethane homogeneous solution, as a spinning solution for spinning micron-sized thick fibers; weigh a certain amount of dry polystyrene particles and dissolve them in N,N-dimethylformamide solvent, and place them in Stir on the magnetic stirrer for 6 hours, obtain the polystyrene homogeneous solution that the mass fraction is 13%, as the spinning solution of spinning beaded nanofiber; Take a certain amount of dry nylon 6 particles and dissolve in formic acid solvent, and It was placed on a magnetic stirrer and stirred for 6 hours to obtain a nylon 6 homogeneous solution with a mass fraction of 15%, as a spinning solution for spinning superfine nanofibers; to prepare a multilayer composite...

Embodiment 2

[0029] Weigh a certain amount of dry polysulfone particles with an electronic balance and dissolve them in a mixed solvent of N,N-dimethylformamide and tetrahydrofuran with a volume ratio of 3:1, and place it on a magnetic stirrer to stir for 6 hours to obtain the mass A polysulfone homogeneous solution with a fraction of 15% is used as a spinning solution for spinning micron-sized thick fibers; a certain amount of dry polyacrylonitrile particles are weighed and dissolved in N,N-dimethylformamide solvent, and Place on a magnetic stirrer and stir for 6 hours to obtain a polyacrylonitrile homogeneous solution with a mass fraction of 10%, as a spinning solution for spinning beaded nanofibers; weigh a certain amount of dry nylon 66 particles and dissolve them in formic acid solvent , and it was placed on a magnetic stirrer and stirred for 6 hours to obtain a nylon 66 homogeneous solution with a mass fraction of 15%, as a spinning solution for spinning superfine nanofibers; to prepa...

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Abstract

The invention relates to a four-layer composite micro-nano fibrous air filtration membrane. A four-layer fibrous layer is characterized by comprising a non-woven fabric substrate layer, an electrospunmicron-sized fibrous layer, an electrospun bead nanometer fibrous layer and an electrospun ultrafine nanometer fibrous layer which are arranged from bottom to top. A preparation method for the four-layer composite micro-nano fiber air filtration membrane comprises a step of sequentially depositing three layers of fibrous filtration membranes with different sizes and different morphologies on thesurface of a non-woven fabric substrate by using an electrospinning technique. The preparation method is characterized in that fiber diameters and pore sizes of every fibrous layer gradually decreasefrom bottom to top and are in gradient distribution. At a wind speed of 5 cm / s, the air filtration membrane prepared in the invention has filtration efficiency of 99.9% or more for filtration of sodium chloride particles with particles sizes of 300 nm and has compressive resistance of less than 40 Pa; so the air filtration membrane has good filtering effect and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of air filter material preparation, and relates to a four-layer composite micro-nano fiber air filter membrane. Background technique [0002] At present, for the removal of fine particles in the air, most rely on traditional fiber filter membranes. Traditional fiber membranes can be divided into two categories: one is glass fiber membranes, and the other is non-woven fiber membranes. Among them, the diameter of glass fiber is small, the fiber packing density is high, and the filtration efficiency of fiber membrane is high. It is widely used in clean rooms and hospital clean rooms with very high filtration accuracy requirements. However, due to the characteristics of smooth surface of glass fiber, small cohesion force between fibers, poor wear resistance and kink resistance of the fiber film, it is easy to break and fall off the fiber during use, resulting in "secondary pollution", which is harmful to the hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/28B01D71/42B01D71/56B01D71/60B01D71/68B01D46/52B01D46/54
CPCB01D46/525B01D46/543B01D67/0002B01D69/12B01D71/28B01D71/42B01D71/56B01D71/60B01D71/68B01D2323/39
Inventor 陈江萍廉季平郑煜铭钟鹭斌冯启源吴仁香王建
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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