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A kind of hydrolysis-resistant electrospun PVA/PAA cross-linked nanofiber membrane and preparation method thereof

A nanofiber membrane, anti-hydrolysis technology, applied in fiber processing, filament/thread forming, textiles and papermaking, etc., can solve the problems of electrospun membrane filtration efficiency, water swelling, etc., to increase hydrolysis resistance and performance The effect of stability and high mechanical properties

Active Publication Date: 2021-02-19
重庆中纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water-soluble polymer nanofibers often have the problem of swelling or even hydrolysis when encountering water, and the filtration efficiency of its electrospun membrane is seriously affected by temperature and humidity. Therefore, it is necessary to cross-link and modify the nanofiber membrane to improve its hydrolysis resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of an anti-hydrolysis electrospun PVA / PAA cross-linked nanofiber membrane, comprising the steps of:

[0026] The first step is to prepare the PVA aqueous solution: accurately weigh 1.7g of PVA (molecular weight: 70,000, degree of alcoholysis 89%) and dissolve it in 8.3g of deionized water, stir magnetically for 3 hours in a water bath at 80°C, and then in a water bath at 20°C Under the condition of magnetic stirring for 30 minutes, the stirring speed is 200r / min, and the uniform and transparent PVA aqueous solution with a mass fraction of 17% is prepared.

[0027] The second step, add the crosslinking agent PAA: accurately weigh 1.7g of PAA (analytical grade) and 8.3g of deionized water, add it to the PVA aqueous solution described in the first step, and then add 1 / 4 of the PVA aqueous solution The aqueous solution of sodium hypophosphite with a mass fraction of 35% by volume was magnetically stirred for 5 hours under the condition of a water bath a...

Embodiment 2

[0032] A preparation method of an anti-hydrolysis electrospun PVA / PAA cross-linked nanofiber membrane, comprising the steps of:

[0033] Step 1: Accurately weigh 0.8g of PVA (molecular weight 80,000, degree of alcoholysis 77%) and dissolve it in 9.2g of deionized water, stir magnetically in a water bath at 80°C for 4 hours, and stir magnetically in a water bath at 25°C for 30 minutes , the stirring speed is 200r / min, and the uniform transparent PVA aqueous solution with a mass fraction of 8% is prepared.

[0034] The second step, add the crosslinking agent PAA: accurately weigh 0.8g of PAA (analytical grade) and 9.2g of deionized water, add to the PVA aqueous solution described in the first step, and then add 1 / 4 of the PVA aqueous solution The sodium hypophosphite aqueous solution with a mass fraction of 30% by volume was magnetically stirred for 3.5 hours under the condition of a water bath at 25° C., and the magnetic stirring speed was 100 r / min, to prepare a uniform transp...

Embodiment 3

[0039] A preparation method of an anti-hydrolysis electrospun PVA / PAA cross-linked nanofiber membrane, comprising the steps of:

[0040]The first step is to prepare the PVA aqueous solution: accurately weigh 1.9g of PVA (molecular weight 74800, degree of alcoholysis 98%) and dissolve it in 8.1g of deionized water, stir magnetically for 4 hours under 90°C water bath conditions, and 30°C water bath conditions Stir magnetically for 30 minutes at a stirring speed of 300 r / min to prepare a uniform transparent PVA aqueous solution with a mass fraction of 19%.

[0041] The second step, add cross-linking agent: accurately weigh 1.9g of PAA (analytically pure) and 8.1g of deionized water, add in the PVA aqueous solution described in the first step, and then add 1 / 4 of the PVA aqueous solution volume The 40% mass fraction of sodium hypophosphite aqueous solution was magnetically stirred for 2 hours under the condition of 30°C water bath, and the magnetic stirring speed was 120r / min, to ...

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Abstract

The invention relates to a hydrolysis-resistant electrospun PVA / PAA crosslinked nanofiber membrane and a preparation method thereof, wherein the preparation method comprises the following steps: (1) preparing a PVA aqueous solution with a mass fraction of 10-30%; Adding PAA aqueous solution and sodium hypophosphite aqueous solution to the aqueous solution and mixing to obtain a PVA / PAA spinning solution; (3) forming nanofibers from the PVA / PAA spinning solution on an electrospinning device to obtain an electrospun membrane; (4) The obtained electrospun membrane is subjected to heat treatment to obtain the obtained electrospun membrane. The beneficial effect is that the obtained PVA / PAA nanofiber membrane no longer swells and hydrolyzes in hot water at 70-90°C, and has enhanced hydrolysis resistance and improved mechanical properties; it can be used for PM2.5 protective masks, screen windows, indoor air Filters, air purifiers, fresh air systems, tap water filtration, white blood cell blood filtration, etc., do not contain organic solvents, are non-toxic and environmentally friendly, and have stable structure and performance.

Description

technical field [0001] The invention belongs to the technical field of electrospinning, and specifically relates to a hydrolysis-resistant electrospun PVA / PAA cross-linked nanofiber membrane and a preparation method thereof, and the involved nanofiber membrane is a hydrolysis-resistant nanofiber-based filter material. Background technique [0002] In recent years, rapid urbanization and industrialization have led to severe air pollution, seriously affecting people's health and quality of life, especially dust particles (PM2. The important cause of haze weather is also one of the main factors leading to respiratory diseases and cardiovascular diseases, so effective protection against it is imminent. Traditional air filtration technology mainly adopts melt-blown electrostatic electret nonwoven technology, the initial filtration efficiency can reach 90-99%, and the resistance is relatively low, but the filtration effect changes drastically with time, temperature and humidity, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/4382D04H1/4282D04H1/728D01D5/00
CPCD01D5/0092D04H1/4282D04H1/4382D04H1/728D10B2321/06D10B2321/08D10B2505/04
Inventor 刘延波杨大祥任倩
Owner 重庆中纳科技有限公司