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Preparation method for water-resistant nano microcrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silicon dioxide composite nanofiber membrane

A technology of composite nanofibers and nanocrystals, applied in spinning solution preparation, textile and papermaking, non-woven fabrics, etc., to achieve the effects of improved comprehensive mechanical properties, controllable diameter and thickness, and good biocompatibility

Active Publication Date: 2014-06-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 for water-resistant nano microcrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silicon dioxide composite nanofiber membrane
  • Preparation method for water-resistant nano microcrystalline cellulose/polyvinyl alcohol/polyacrylic acid/silicon dioxide composite nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of nanocrystalline cellulose: Microcrystalline cellulose (MCC) was mixed with 64% H 2 SO 4Add 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 sol...

Embodiment 2

[0037] (1) Preparation of nanocrystalline cellulose: Microcrystalline cellulose (MCC) was mixed with 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 so...

Embodiment 3

[0046] (1) Preparation of nanocrystalline cellulose: Microcrystalline cellulose (MCC) was mixed with 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 so...

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Abstract

The invention relates to a preparation method for a water-resistant nano microcrystalline cellulose / polyvinyl alcohol / polyacrylic acid / silicon dioxide composite nanofiber membrane. The preparation method includes the steps that (1), a polymer solution is prepared by polyvinyl alcohol and polyacrylic acid by the mass ratio of 1:1-1:5; (2), nano microcrystalline cellulose different in weight is added into the polymer solution in the step1, and therefore a 1wt-8wt% nano microcrystalline cellulose / polyvinyl alcohol / polyacrylic acid solution is prepared; (3), 1 g-2 g of tetraethyl orthosilicate, 2 g of alcohol, 1g of water and 0.8 mol / L hydrochloric acid are mixed to prepare a tetraethyl orthosilicate solution to be subjected to prehydrolysis; (4), the tetraethyl orthosilicate solution after prehydrolysis and a solution in the step2 after ultrasonic processing for 2 minutes-5 minutes are mixed according to the mass ratio of 1:3 to prepare a spinning solution, and a nanfiber membrane is prepared through a static spinning technology; (5), the prepared nanofiber membrane is dried for 12 h in a vacuum drying box at the temperature of 40 DEG C and then placed in a high-temperature vacuum drying box to be heated for 1 h. The defect that a polyvinyl alcohol nanofiber membrane is poor in water-resistant performance is overcome, and the preparation method has the advantages of being simple in preparation process, little in environment pollution, excellent in mechanical performance and the like. Three kinds of functional groups on the surface of the nanofiber surface greatly enable the application space of material to be expanded.

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 Applications(China)
IPC IPC(8): D04H1/728D04H1/4382D01D1/02
Inventor 徐冉李风亭司艺方
Owner TONGJI UNIV
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