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Preparation method of water-resistant nanocrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silica composite nanofiber membrane

A technology of composite nanofibers and nanocrystals, which is applied in the preparation of spinning solution, textiles, papermaking, non-woven fabrics, etc., to achieve the effects of uniform diameter, improved comprehensive mechanical properties, and controllable diameter

Active Publication Date: 2016-03-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no reports on the preparation of new nano-microcrystalline cellulose / polyvinyl alcohol / polyacrylic acid / silicon dioxide by using nano-cellulose as a green organic enhancer by sol-gel method and electrospinning technology

Method used

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  • Preparation method of water-resistant nanocrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silica composite nanofiber membrane
  • Preparation method of water-resistant nanocrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silica composite nanofiber membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of nanocrystalline cellulose: microcrystalline cellulose (MCC) and 64% H 2 SO 4 Add it into a three-necked flask at a solid-to-liquid ratio of 1:10 g / mL, stir and heat at 50°C for 1 h, wash the product with deionized water and centrifuge until the pH of the solution is neutral, and obtain an NCC suspension. The obtained NCC suspension was centrifuged at high speed for 3 times (5min, 8000rpm), and finally the centrifuged suspension was vacuum freeze-dried for 48h, and ground into powder for later use;

[0028](2) Preparation of 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution: add 5g polyvinyl alcohol to 95g deionized water, heat in a water bath at 70°C for 5 hours to obtain 5% polyvinyl alcohol aqueous solution; add 10g polyacrylic acid to 90g deionized water In water, stir at room temperature for 12 hours to obtain 10% polyacrylic acid aqueous solution;

[0029] (3) Mix 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution prepa...

Embodiment 2

[0037] (1) Preparation of nanocrystalline cellulose: microcrystalline cellulose (MCC) and 64% H 2 SO 4 Add it into a three-necked flask at a solid-to-liquid ratio of 1:10 g / mL, stir and heat at 50°C for 1 h, wash the product with deionized water and centrifuge until the pH of the solution is neutral, and obtain an NCC suspension. The obtained NCC suspension was centrifuged at high speed for 3 times (5min, 8000rpm), and finally the centrifuged suspension was vacuum freeze-dried for 48h, and ground into powder for later use;

[0038] (2) Preparation of 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution: add 5g polyvinyl alcohol to 95g deionized water, heat in a water bath at 70°C for 5 hours to obtain 5% polyvinyl alcohol aqueous solution; add 10g polyacrylic acid to 90g deionized water In water, stir at room temperature for 12 hours to obtain 10% polyacrylic acid aqueous solution;

[0039] (3) Mix 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution prep...

Embodiment 3

[0046] (1) Preparation of nanocrystalline cellulose: microcrystalline cellulose (MCC) and 64% H 2 SO 4 Add it into a three-necked flask at a solid-to-liquid ratio of 1:10 g / mL, stir and heat at 50°C for 1 h, wash the product with deionized water and centrifuge until the pH of the solution is neutral, and obtain an NCC suspension. The obtained NCC suspension was centrifuged at high speed for 3 times (5min, 8000rpm), and finally the centrifuged suspension was vacuum freeze-dried for 48h, and ground into powder for later use;

[0047] (2) Preparation of 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution: add 5g polyvinyl alcohol to 95g deionized water, heat in a water bath at 70°C for 5 hours to obtain 5% polyvinyl alcohol aqueous solution; add 10g polyacrylic acid to 90g deionized water In water, stir at room temperature for 12 hours to obtain 10% polyacrylic acid aqueous solution;

[0048] (3) Mix 5% polyvinyl alcohol and 10% polyacrylic acid aqueous solution prep...

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Abstract

The invention relates to a preparation method of nano-microcrystalline cellulose / polyvinyl alcohol / polyacrylic acid / silicon dioxide composite nanofiber membrane. (1) Prepare a polymer solution with a mass ratio of polyacrylic acid and polyvinyl alcohol of 1:1~1:5; (2) Add different masses of nanocrystalline cellulose to (1) the polymer solution to prepare 1wt%~8wt % nanocrystalline cellulose / polyvinyl alcohol / polyacrylic acid solution; (3) Mix 1~2g tetraethyl orthosilicate with 2g alcohol, 1g water and 0.8mol / L hydrochloric acid to prepare prehydrolyzed tetraethyl orthosilicate Ethyl ester solution; (4) Mix the pre-hydrolyzed tetraethyl orthosilicate solution with the (2) solution after ultrasonication for 2~5min at a mass ratio of 1:3 to obtain a spinning solution, which is produced by electrospinning technology (5) Dry the prepared nanofiber membrane in a vacuum drying oven at 40° C. for 12 hours, and then put it into a high-temperature vacuum drying oven for heating for 1 hour. The invention overcomes the disadvantage of poor water resistance of the polyvinyl alcohol nano fiber membrane, and has the characteristics of simple preparation process, low environmental pollution, excellent mechanical properties and the like. The three modifiable functional groups on the surface of the fiber membrane greatly expand the application space of this material.

Description

technical field [0001] The invention relates to a preparation technology of a composite nanofiber membrane, in particular to a preparation method of a water-resistant nano-microcrystalline cellulose / polyvinyl alcohol / polyacrylic acid / silicon dioxide composite nanofiber membrane. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of multiple glucose molecules. Among the polysaccharide biomaterials, cellulose, as the oldest and most abundant natural polymer on the earth, is inexhaustible and the most precious natural renewable resource for human beings. Cellulose widely exists in a large number of plants, animals and bacteria. Hemp, wheat straw, straw, bagasse, etc. are all rich sources of cellulose. The cellulose that can be produced in nature every year is as high as 10 10 to 10 11 Ton. Its research and development not only helps to alleviate the increasingly serious energy crisis, but also promotes the development of environmental protec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D04H1/4382D01D1/02
Inventor 徐冉李风亭司艺方袁建梅
Owner TONGJI UNIV
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