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Hydrophilic nanofiber membrane for multistage filtration and preparation method thereof

A technology of nanofiber membrane and manufacturing method, which is applied in the field of multi-stage filtration hydrophilic nanofiber membrane and its manufacturing, can solve the problems of unsustainable modification effect, large environmental pollution by chemical modification method, and influence on service life, etc., to achieve Effect of improving hydrophilicity and increasing stain resistance

Pending Publication Date: 2020-04-17
HANGZHOU DEEFINE FILTRATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, due to the poor hydrophilicity of PVDF itself, it is prone to membrane fouling during use, and at the same time affects its filtration flux. Although the nanofibers made of PVDF have strong pollution resistance, they are especially suitable for biopharmaceuticals and beer juice drinks. It is easy to adsorb proteins and colloids, which affects its service life. Improving the hydrophilicity of PVDF has been proven to effectively improve its anti-pollution performance and greatly increase its filtration flux. At present, most of the common methods of improving membrane hydrophilicity use physical modification. Chemical modification methods such as radiation grafting, ultraviolet grafting modification, plasma surface modification, etc., the modified filter membrane prepared by physical modification method, the modification effect is not long-lasting, However, the chemical modification method pollutes the environment a lot, and puts a lot of pressure on enterprises to invest in environmental protection.

Method used

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  • Hydrophilic nanofiber membrane for multistage filtration and preparation method thereof
  • Hydrophilic nanofiber membrane for multistage filtration and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The nanofiber membrane of this embodiment has a two-stage structure, including a base layer and a layer of superfine fiber layer compounded on the base layer; the specific preparation steps are as follows:

[0030] Base layer spinning solution configuration:

[0031] (1) According to the volume ratio of 7.3:2.7, measure N,N-dimethylacetamide and acetone respectively, stir and mix evenly to obtain mixed solution 1.

[0032] (2) Weigh polyvinylidene fluoride, place it in an oven at 80°C, and dry it for 24 hours to obtain polyvinylidene fluoride dry powder. Weigh polyvinylidene fluoride dry powder and add it to mixed solution 1, stir and mix evenly to obtain a reaction precursor One, in the reaction precursor solution one, the mass fraction of polyvinylidene fluoride is 9.5%.

[0033] (3) Pour the reaction precursor solution into the stirring reaction kettle, turn on the agitator, set the temperature of the reaction kettle to 75°C, and the stirring speed to 800r / min, keep...

Embodiment 2

[0044] The nanofiber membrane of this embodiment has a two-stage structure, including a base layer and a layer of superfine fiber layer compounded on the base layer; the specific preparation steps are as follows:

[0045] Base layer spinning solution configuration:

[0046] (1) Measure N,N-dimethylacetamide and acetone respectively according to the volume ratio of 6:4, stir and mix evenly to obtain mixed solution 1.

[0047] (2) Weigh polyvinylidene fluoride, place it in an oven at 80°C, and dry it for 24 hours to obtain polyvinylidene fluoride dry powder. Weigh polyvinylidene fluoride dry powder and add it to mixed solution 1, stir and mix evenly to obtain a reaction precursor One, in the reaction precursor solution one, the mass fraction of polyvinylidene fluoride is 10.6%.

[0048] (3) Pour the reaction precursor solution into the stirring reaction kettle, turn on the agitator, set the temperature of the reaction kettle to 70°C, and the stirring speed to 1200r / min, continu...

Embodiment 3

[0059] The nanofiber membrane of this embodiment has a three-level structure, including a base layer and a first-level ultrafine fiber layer and a second-level ultrafine fiber layer on the composite base layer; the specific preparation steps are as follows:

[0060] Base layer spinning solution configuration:

[0061] (1) Measure N,N-dimethylacetamide and acetone respectively according to the volume ratio of 5:5, stir and mix evenly to obtain mixed solution 1.

[0062] (2) Weigh polyvinylidene fluoride, place it in an oven at 95°C, and dry it for 22 hours to obtain polyvinylidene fluoride dry powder. Weigh polyvinylidene fluoride dry powder and add it to mixed solution 1, stir and mix evenly to obtain a reaction precursor 1. In the reaction precursor solution 1, the mass fraction of polyvinylidene fluoride is 12%.

[0063] (3) Pour the reaction precursor solution into the stirring reaction kettle, turn on the agitator, set the temperature of the reaction kettle to 80°C, and t...

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Abstract

The invention discloses a hydrophilic nanofiber membrane for multistage filtering and a preparation method thereof, belonging to the technical field of nanofiber membranes. The multistage filtration hydrophilic nanofiber membrane provided by the invention comprises a substrate layer and at least one superfine fiber layer compounded on the substrate layer, wherein the filtering precision of the superfine fiber layers is increased layer by layer along a direction increasingly away from the substrate layer. Each superfine fiber layer is prepared from the following raw materials: N,N-dimethylformamide, N,N-dimethylacetamide, acetone, polyvinylidene fluoride and polyacrylonitrile. The method for preparing the nanofiber membrane comprises the following steps: preparation of a spinning solution for the substrate layer, preparation of a spinning solution for the superfine fiber layers, and electrostatic spinning. The preparation method disclosed by the invention is relatively simple in process, and suitable for large-scale production and popularization; the hydrophilicity of the prepared nanofiber membrane is improved, the dirt holding capacity of the nanofiber membrane is improved to a certain extent, absolute filtering precision can reach 0.45 micron, and filtering efficiency can reach 99.5% or above.

Description

technical field [0001] The invention relates to the technical field of nanofiber membranes, in particular to a multi-stage filtration hydrophilic nanofiber membrane and a manufacturing method thereof. Background technique [0002] The electrospun nanofiber filter membrane has a high specific surface area, the fiber mat formed by it has a high porosity, and the internal pore connectivity is good, and it is easy to combine with nano-sized particles, which is very suitable for use as a filter separation material. [0003] Nanofibers produced by electrospinning technology have the following characteristics: [0004] (1) The fiber diameter is small and the uniformity is good. One of the effective ways to improve the filtration performance of fiber filter materials is to reduce the diameter of the fibers, because for fiber filters prepared from fibers with a diameter of tens of microns, the filtration efficiency of the filter material will increase as the fiber diameter decreases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
CPCB01D71/34B01D69/081B01D67/0002B01D2325/36B01D2323/39
Inventor 李圣泉王文富冯建永
Owner HANGZHOU DEEFINE FILTRATION TECH