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Nanofiber filter material

A filter material and nanofiber technology, which is applied in the fields of filtration and separation, chemical instruments and methods, separation methods, etc., can solve the problems of limiting the wide application of high-efficiency filter materials, reducing air permeability, and reducing service life, and achieving productivity The effect of high and low pressure drop, high quality factor

Inactive Publication Date: 2014-01-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, most of the work still needs to be carried out on laboratory-scale single-needle spinning equipment, which has a low output and a liquid feed rate of generally 0.1-5ml / hour
Secondly, although electrospun nanofibers have remarkable characteristics of high-efficiency filtration, studies have also shown that the membrane structure of electrospun nanofibers is relatively dense. When the filtration efficiency is significantly improved, the pressure drop will also increase rapidly and the air permeability will decrease. , thereby reducing the service life of the product, which largely limits its wide application as a high-efficiency filter material

Method used

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Examples

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Embodiment 1

[0020] The nanofiber filter material is prepared by the solution jet spinning technology in Chinese invention patent ZL201110041792.3, specifically, the nanofiber layer is prepared by preparing an 18% anhydrous formic acid solution of nylon 6 polymer through the solution jet spinning technology. The diameter of the obtained nanofiber filter material is a continuous polymer porous nanofiber layer with a diameter of 500-700 nanometers, the proportion of pores with a pore diameter of 4um-6um in the nanofiber layer accounts for more than 95%, and the grammage of the nanofiber layer is 4.5g / m 2, the nanofiber is a three-dimensional curled shape, and the porosity of the nanofiber layer is more than 95%; when the average particle size is 0.3 μm particles are filtered by the airflow with a surface velocity of 5.33 cm / s, the filtration efficiency of the nanofiber layer of the filter material is 85% or more, the initial pressure drop is 3mmH 2 O, the filter quality factor Q of the filte...

Embodiment 2

[0022] The nanofiber filter material is prepared by the solution jet spinning technology in Chinese invention patent ZL201110041792.3, specifically, 14% N,N-Di The nanofibrous layer was prepared from methylformamide (DMF) solution. The diameter of the obtained nanofiber filter material is a continuous polymer porous nanofiber layer with a diameter of 200-500 nanometers, the proportion of pores with a pore diameter of 2um-5um in the nanofiber layer accounts for more than 95%, and the gram weight of the nanolayer is 3.5g / m 2 , the nanofiber is a three-dimensional crimped shape, and the porosity of the nanofiber layer is 90%; when the average particle diameter is filtered by an airflow with a surface velocity of 5.33cm / s when the average particle size is 0.3 μm particles, the filtration efficiency of the nanofiber layer of the filter material is More than 90%, the initial pressure drop is 5mmH 2 O, the filter quality factor Q of the filter material F is 0.07 (1 / mmH 2 O).

Embodiment 3

[0024] The nanofiber filter material is prepared by the solution jet spinning technology in the Chinese invention patent ZL201110041792.3, specifically the 12% N,N- Dimethylacetamide (DMAc) solution to prepare nanofiber layer. The diameter of the obtained nanofiber filter material is a continuous polymer porous nanofiber layer with a diameter of 50-200 nanometers, the proportion of pores with a pore diameter of 1um-2um in the nanofiber layer accounts for more than 95%, and the grammage of the nanolayer is 2.5g / m 2 , the nanofiber is a three-dimensional curled shape, and the porosity of the nanofiber layer is more than 95%; when the average particle size is 0.3 μm particles are filtered by the airflow with a surface velocity of 5.33 cm / s, the filtration efficiency of the nanofiber layer of the filter material is Over 95%, the initial pressure drop is 8mmH 2 O, the filter quality factor Q of the filter material F is 0.06 (1 / mmH 2 O).

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Abstract

The invention relates to a nanofiber filter material which comprises at least one porous nanofiber layer formed by continuous polymer fibers with a diameter less than 1000 nm. The nanofiber filter material is characterized in that the nanofibers are prepared by the solution jet spinning technology, the gram weight of each nano-layer is at least 1.5 g / m<2>; the nanofibers are in a three-dimensional curled state, the porosity of the fiber layer is more than 95%, and the proportion of the pores having an aperture of 1-10 micron in the fiber layer is more than 95%. When particles having a mean grain size of 0.3 micron are filtered at a surface speed of 5.33 cm / s, the filtration efficiency of the filter material nanofiber layer is at least 40%, the initial pressure drop is less than 8 mmH2O, and the filtration quality factor QF of the filter material is higher than 0.06 (1 / mmH2O). The nanofiber filter material provided by the invention has a filtering property with high efficiency and low resistance.

Description

technical field [0001] The invention relates to a nanofiber filter material, in particular to the application of a nanofiber layer prepared by a solution jet spinning technique on an air filter material. Background technique [0002] With the rapid development of science and technology and modern industry, a large amount of waste gas and dust, such as industrial waste gas, combustion, exhaust gas, etc., have seriously polluted the living environment of human beings, especially the particle pollutants with a diameter of less than 2.5 microns that are widely present in the atmosphere in recent years The harm of (PM2.5) has attracted worldwide attention. After inhalation, it will directly enter the bronchi, causing diseases including asthma, bronchitis, pneumoconiosis and cardiovascular disease. At the same time, with the development of electronics, precision machinery, metallurgy, aerospace, nuclear energy, chemical industry and other industries, as well as medical, pharmaceut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B32B27/02
Inventor 程博闻庄旭品石磊康卫民李红军李孟芹
Owner TIANJIN POLYTECHNIC UNIV
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