Two-dimensional reticular hairline nanometer fiber material used for air filtration and preparation method of material

A two-dimensional mesh and air filtration technology, which is applied in fiber processing, textiles and papermaking, non-woven fabrics, etc., can solve the problems of inability to achieve material filtration performance, low filtration efficiency of small particle size particles, and easy-to-collapse pore structure. Achieve continuous and seamless stacking, facilitate gas passage, and enhance structural stability

Active Publication Date: 2017-11-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing air filter materials generally have the defects of low filtration efficiency and large resistance pressure drop, which cannot meet people's needs for high-efficiency and low-resistance air filter materials. Electrospun fibers are expected to become ideal air filter material
The relevant published patents of electrospun fiber air filter materials include "A composite nanofiber air filter material and its preparation method" (CN201610034552.3), "An electrospun nanofiber air filter material and its preparation method" (CN201610381988.X), "A high-efficiency and low-resistance electrospinning nanofiber air filter material and its batch preparation method" (CN201610784058.9), etc., but the fiber diameter in the air filter material prepared by the above method is still relatively thick, and the pore size of the fiber membrane is large, resulting in a small material pair The filtration efficiency of particle size particles is low, and the resistance pressure drop is large
[0003] In order to further obtain high-efficiency and low-resistance electrospun air filter materials, the patent "A high-efficiency and low-resistance nanofiber air filter material for masks and its preparation method" (CN201510009971.7) reported a preparation of a three-dimensional cavity structure The method of high-efficiency and low-resistance air filter materials, but the beaded fibers used in this material have poor continuity and are easy to slip, and the cavity structure is easy to collapse, resulting in deformation of the pore structure, making the application

Method used

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  • Two-dimensional reticular hairline nanometer fiber material used for air filtration and preparation method of material

Examples

Experimental program
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Example Embodiment

[0028] Example 1

[0029] A two-dimensional networked ultra-fine nanofiber material for air filtration and a preparation method thereof, the steps are as follows:

[0030] 1) Dissolve silver nitrate in tetrahydrofuran, stir with a magnetic stirrer for 60 minutes, and sonicate for 20 minutes with an ultrasonic instrument. The content of silver nitrate is 0.002wt% of the total mass of the polymer solution, and then the granular polystyrene polymer with a molecular weight of 1.0 ×10 7 , Added to the tetrahydrofuran solvent in which silver nitrate is dissolved, stirred at room temperature for 6 hours to obtain a uniform and stable polymer solution, the mass concentration of polystyrene in the solution is 0.01 wt%, and the viscosity of the obtained solution is 350 mPa·s.

[0031] 2) Using the device shown in the figure, the polymer solution obtained above is delivered to the spinneret of the jetting device 3 through the liquid supply system 2. The jetting device is connected to the DC hig...

Example Embodiment

[0032] Example 2

[0033] A two-dimensional networked ultra-fine nanofiber material for air filtration and a preparation method thereof, the steps are as follows:

[0034] 1) Dissolve lithium chloride in N,N-dimethylacetamide, stir with a magnetic stirrer for 10 minutes, and ultrasonic wave for 15 minutes. The content of lithium chloride is 0.00075wt% of the total mass of the polymer solution. Polyurethane polymer with a molecular weight of 1.2×10 7 , Added to the N,N-dimethylacetamide solvent dissolved with lithium chloride, stirred at room temperature for 5h to obtain a uniform and stable polymer solution, the mass concentration of polyurethane in the solution is 0.005wt%, and the viscosity of the resulting solution is 200mPa·s.

[0035] 2) Using the device shown in the figure, the polymer solution obtained above is delivered to the spinneret of the spraying device 3 through the liquid supply system 2. The spraying device is connected to the DC high-voltage power supply 1, and the...

Example Embodiment

[0036] Example 3

[0037] A two-dimensional networked ultra-fine nanofiber material for air filtration and a preparation method thereof, the steps are as follows:

[0038] 1) Dissolve sodium chloride in N,N-dimethylacetamide, stir with a magnetic stirrer for 40 minutes, and ultrasonic wave for 10 minutes. The content of sodium chloride is 0.0001wt% of the total mass of the polymer solution. Ethylene-vinyl alcohol copolymer with a molecular weight of 2×10 7 , Added to N,N-dimethylacetamide dissolved in sodium chloride, stirred for 2h at 60℃ in a water bath to obtain a uniform and stable polymer solution. The mass concentration of the ethylene-vinyl alcohol copolymer in the solution is 0.001wt %, the viscosity of the obtained solution was 100 mPa·s.

[0039] 2) Using the device shown in the figure, the polymer solution obtained above is delivered to the spinneret of the spraying device 3 through the liquid supply system 2. The spraying device is connected to the DC high-voltage power ...

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Abstract

The invention provides a two-dimensional reticular hairline nanometer fiber material used for air filtration and a preparation method of the material. The preparation method is characterized in that a high-molecular-weight polymer is selected, a polymer solution low in mass concentration is prepared, then in the electrostatic spraying process, a spinning nozzle is vibrated in situ by using external force, and the generation of charged droplets is promoted; meanwhile, by regulating the vapor concentration of a solvent in a closed spinning environment, the droplets form the two-dimensional reticular hairline nanometer fiber air filtration material on the surface of a receiving substrate after phase separation, wherein a punctiform adhesion structure is formed between the material and the substrate. The material is continuously and seamlessly stacked, the average diameter of the fibers in the net is 3-50 nm, meshes have a stable Steiner minimal-tree structure, the average mesh diameter is 10-500 nm, the porosity is equal to or larger than 75%, the filtering efficiency of the material to the particulate matter with the partical size of 0.01-5 micrometers is larger than 99.999%, and the resistance pressure drop is smaller than 50 Pa. the preparation process is simple, few materials are limited, and the reticular hairline nanometer fiber air filtration material has a tiny mesh structure and good channel connectivity, and shows a great application prospect in the field of air filtration.

Description

technical field [0001] The invention belongs to the field of nanofiber filter materials, and relates to an air filter material composed of two-dimensional network ultrafine nanofibers and a preparation method thereof. Background technique [0002] At present, with the continuous acceleration of industrialization and urbanization in our country, the problem of air pollution in our country is becoming more and more serious, especially in recent years, frequent smog pollution not only endangers human health but also seriously affects industrial production and daily life. Among the many haze pollution control methods, the filtration method has become the most widely used method because of its simplicity and economy. However, the existing air filter materials generally have the defects of low filtration efficiency and large resistance pressure drop, which cannot meet people's needs for high-efficiency and low-resistance air filter materials. Electrospun fibers are expected to bec...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D5/00
CPCD01D5/0038D04H1/728D10B2505/04
Inventor 丁彬张世超刘惠印霞俞建勇
Owner DONGHUA UNIV
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