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Waterproof polyvinyl alcohol nanofiber membrane and preparation method thereof

A nanofiber membrane, polyvinyl alcohol technology, used in heating/cooling fabrics, textiles and papermaking, fabric surface trimming, etc., can solve the problem of poor water resistance of polyvinyl alcohol nanofibers, improve polyvinyl alcohol nanofibers, and cannot mask filter materials Use and other problems to achieve the effect of improving spinning efficiency, no toxic side effects, and improving water resistance

Active Publication Date: 2016-06-08
刘丽娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although polyvinyl alcohol (PVA) materials are easy to process, environmentally friendly, and have excellent performance, the water resistance of polyvinyl alcohol nanofibers is poor. When used as a filter material, the presence of water vapor will cause polyvinyl alcohol nanofibers to absorb water and swell or even dissolve. Make it impossible to use as mask filter material or water filter material
At present, there is no report or technology that can improve the water resistance of polyvinyl alcohol nanofibers simply and efficiently.

Method used

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  • Waterproof polyvinyl alcohol nanofiber membrane and preparation method thereof
  • Waterproof polyvinyl alcohol nanofiber membrane and preparation method thereof
  • Waterproof polyvinyl alcohol nanofiber membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing polyvinyl alcohol nanofibers with excellent water resistance, comprising the steps of:

[0031] 1) First add 5 parts by weight of formic acid to 100 parts by weight of water to prepare a mixed solvent, then add 8.5 parts by weight of polyvinyl alcohol PVA1799 and 3.2 parts of glutaraldehyde in sequence, mechanically stir at 80°C for 3 hours, and prepare a spinning stock solution.

[0032] 2) Use a 20mL needle to absorb the feed liquid, cover with a needle with an inner diameter of 0.8mm, and squeeze out air bubbles; use the needle as the positive electrode and tinfoil (15cm*30cm) as the negative electrode, and start spinning. The spinning conditions are: 15°C; relative humidity: 50 -55%; spinning voltage 20KV; spinning current 0mA; injection speed 1mL / min; needle plate distance 17.8cm.

[0033] 3) After the spinning is completed, put the polyvinyl alcohol nanofiber membrane into a blast drying oven for 20 minutes at 150° C. for drying.

[0034] T...

Embodiment 2

[0036] A method for preparing polyvinyl alcohol nanofibers with excellent water resistance, comprising the steps of:

[0037] 1) First add 18 parts by weight of acetic acid and 8.5 parts by weight of ethanol to 100 parts by weight of water to configure a mixed solvent, then add 11.5 parts by weight of polyvinyl alcohol PVA1799, 1.6 parts of glutaraldehyde and 0.3 parts by weight of ammonium persulfate, Stir mechanically at 85°C for 5 hours, and configure it as a spinning stock solution.

[0038] 2) Use a 20mL needle to absorb the feed liquid, cover with a needle with an inner diameter of 0.8mm, and squeeze out air bubbles; use the needle as the positive electrode and tinfoil (15cm*30cm) as the negative electrode, and start spinning. The spinning conditions are: 18°C; relative humidity: 50 -55%; spinning voltage 20KV; spinning current 0mA; injection speed 1.1mL / min; needle-plate distance 18cm.

[0039] 3) After the spinning is completed, put the polyvinyl alcohol nanofiber mem...

Embodiment 3

[0041] A method for preparing polyvinyl alcohol nanofibers with excellent water resistance, comprising the steps of:

[0042] 1) First add 20 parts by weight of propionic acid to 100 parts by weight of water to prepare a mixed solvent, then add 14 parts by weight of polyvinyl alcohol PVA1799 in sequence, mechanically stir at 90°C for 4 hours, and prepare a spinning stock solution.

[0043] 2) Use a 20mL needle to absorb the feed liquid, cover with a needle with an inner diameter of 0.8mm, and squeeze out air bubbles; use the needle as the positive electrode and tinfoil (15cm*30cm) as the negative electrode, and start spinning. The spinning conditions are: 20°C; relative humidity: 50 -55%; spinning voltage 20KV; spinning current 0mA; injection speed 1.1mL / min; needle-plate distance 18cm.

[0044] 3) Put the polyvinyl alcohol nanofiber membrane obtained in step 3) into a YN-280 glutaraldehyde fumigation cabinet (Yaohua Medical Instrument Factory) to carry out glutaraldehyde fumi...

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Abstract

The invention discloses a polyvinyl alcohol nanofiber membrane good in water resistance and a preparation method thereof. In the method, ionized water, organic acid, alcohols, polyvinyl alcohol, a crosslinking agent and a catalyst serve as main raw materials for electrostatic spinning solution; and the degree of crosslinking of the polyvinyl alcohol nanofiber membrane is improved through heat treatment after electrostatic spinning. A disclosed process is green and environmentally friendly. Compared with a conventional nanofiber filtering material, the polyvinyl alcohol nanofiber membrane is free of solvent recovery and solvent residue problems and free of toxic and side effect, and the prepared polyvinyl alcohol nanofiber membrane has excellent water resistance and can serve as a medical dressing or an air filtering material.

Description

technical field [0001] The invention relates to the field of new chemical materials, in particular to a nanofiber membrane and a preparation method thereof. Background technique [0002] With the rapid development of nanomaterials, nanofiber preparation technology, especially electrospinning technology, has been greatly developed. At present, nanofiber filter materials that have been marketed include polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), nylon 6 (PA6) and other materials, the electrospinning process needs to use organic solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Electrospinning is carried out under high pressure, which may generate electric sparks, and organic solvents are volatile, and may cause explosions under poor ventilation. Moreover, organic solvents pollute the environment a lot, and a solvent recovery device is required in the production process, and the cost is relatively high. Organic solvents still remain in the n...

Claims

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Application Information

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IPC IPC(8): D04H1/4309D04H1/728D06C7/00
CPCD04H1/4309D04H1/728D06C7/00D10B2505/04
Inventor 刘丽娟
Owner 刘丽娟
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