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Washable mask core fiber filter material and preparation method thereof

A water-washable, fiber filtration technology, used in fiber processing, textiles and papermaking, non-woven fabrics, etc., can solve the problems of uncontrollable membrane cross-linking process, easy peeling, weak single-layer membrane strength, etc., to solve the cross-linking process. uncontrollable effects

Active Publication Date: 2021-06-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved by the present invention are: general nanofiber membrane composite filter materials are easy to peel off between layers, the single-layer membrane is weak in strength, poor in water washability, and uncontrollable in the membrane cross-linking process.

Method used

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  • Washable mask core fiber filter material and preparation method thereof
  • Washable mask core fiber filter material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A core fiber filter material of a washable mask and a preparation method thereof, the steps are as follows:

[0031] (1) Polyurethane is dissolved in N,N-dimethylformamide and preparation concentration is the solution of 25wt%, wherein the concentration of crosslinking agent orthosilicate is 0.004wt%; Polyimide is dissolved in N simultaneously , in N-dimethylformamide, prepare a solution with a concentration of 20wt%, wherein the concentration of the crosslinking agent N,N'-1,4-phenylene bismaleimide is 0.002wt%.

[0032] (2) Place the polyurethane spinning solution prepared in step 1 in the liquid supply device, adjust the electrospinning process parameters: voltage 40kV, spinning distance 40cm, spinning speed 1m / min, spinning ambient temperature 25°C, Humidity 30%; start the high-voltage power supply, start electrospinning, and deposit a dense layer of nanofibers on the receiving device, in which the diameter of the nanofibers is 0.3 μm, the pore size of the dense lay...

Embodiment 2

[0037] A core fiber filter material of a washable mask and a preparation method thereof, the steps are as follows:

[0038] (1) Dissolve polyacrylonitrile in dimethyl sulfoxide to prepare a solution with a concentration of 22wt%, wherein the concentration of the crosslinking agent orthosilicate is 0.005%; simultaneously dissolve polyimide in N, N - In dimethylformamide, prepare a solution with a concentration of 25 wt%, wherein the concentration of the cross-linking agent N,N'-1,4-phenylene bismaleimide is 0.01 wt%.

[0039] (2) Place the polyacrylonitrile spinning solution prepared in step 1 in the liquid supply device, and adjust the electrospinning process parameters: voltage 40kV, receiving distance 40cm, perfusion speed 1m / min, spinning temperature 25°C, relative environment Humidity 20%; start the high-voltage power supply, start electrospinning, and deposit a dense layer of nanofibers on the receiving device, wherein the diameter of the nanofibers is 0.04 μm, the pore s...

Embodiment 3

[0044] A core fiber filter material of a washable mask and a preparation method thereof, the steps are as follows:

[0045] (1) dissolving polyvinylidene fluoride in N,N-dimethylformamide to prepare a solution with a concentration of 18wt%, wherein the concentration of the crosslinking agent orthosilicate is 0.5wt%; Dissolved in dichloromethane to prepare a solution with a concentration of 22 wt%, in which the concentration of the crosslinker 2,2'-bis[4-(4-maleimidophenoxy)phenyl]propane was 0.6 wt% .

[0046] (2) Place the polyvinylidene fluoride spinning solution prepared in step 1 in the liquid supply device, adjust the electrospinning process parameters: voltage 50kV, receiving distance 45cm, perfusion speed 1.5m / min, spinning temperature 30°C, The relative humidity of the environment is 25%; start the high-voltage power supply, start electrospinning, and the dense layer of nanofibers is deposited on the receiving device. The diameter of the nanofibers is 0.03 μm, the por...

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Abstract

The invention discloses a washable mask core fiber filter material and a preparation method thereof. The preparation method comprises the following steps: a nanofiber compact layer and a nanofiber fluffy layer are prepared by respectively regulating and controlling solvent / moisture double diffusion speeds of different spinning solutions under the action of a high-voltage electrostatic field, and the nanofiber compact layer and the nanofiber fluffy layer are sequentially deposited on a receiving base material to obtain a composite layer; and after the composite layer is subjected to step-by-step heat treatment and dotted ultrasonic compounding by a sectional type high-temperature / ultrasonic compounding device, a functional group type cross-linking agent in the compact layer fiber forms an inner cross-linked network structure in the fiber, meanwhile, a haplotype cross-linking agent in the fluffy layer fiber forms a semi-interpenetrating cross-linked network in the fiber, then the fibers with the lower glass transition temperature are molten, heat bonding points are generated among the fibers, so that the fiber filter material with a multi-stage cross-linked structure is obtained in one step. The invention provides the preparation method of the washable mask core filter material which is not prone to peeling between layers and can be repeatedly used.

Description

technical field [0001] The invention relates to a core fiber filter material for a washable mask and a preparation method thereof, belonging to the technical field of nanomaterials. Background technique [0002] Masks are mainly divided into three categories: civilian protective masks, industrial labor protection masks, and medical masks. Most of the existing masks on the market are disposable masks, and the core functional layer is usually made of electret melt-blown non-woven fabric, which acts as an electrostatic adsorption filter for filtering particles, droplets or bacteria. However, the electret melt-blown non-woven fabric is prone to failure after washing, resulting in a decrease in its filtration efficiency, so the existing disposable masks cannot be reused. Electrospun nanofibrous membrane has the advantages of small fiber diameter and high porosity, and has a good interception effect on particulate matter, bacteria and viruses, but its poor mechanical properties l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4374D01D5/00D04H1/542D04H1/555D04H1/559
CPCD04H1/728D04H1/4374D01D5/003D04H1/542D04H1/555D04H1/559
Inventor 丁彬马彩娟杨铭田昱城王赛张世超印霞俞建勇
Owner DONGHUA UNIV
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