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Nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and preparing method thereof

A technology of nanofibers and nanocrystals, applied in textiles, papermaking, nonwovens, etc., can solve problems affecting the degree of industrialization, expensive raw materials, cumbersome preparation steps, etc., and achieve environmental protection of humidity-responsive materials, rapid recovery speed, and production The effect of simple process

Active Publication Date: 2017-10-20
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, CN 103529085 B, CN 103512927 B, CN 102826761 A, CN 103217458 A, CN 104569074A, CN 102435636 A and other patents use ZnO and FeO 3 、TiO 2 、CoTiO 3 , BaTiO 3 , multi-walled carbon nanotubes, graphene, polypyrrole and other materials are added to fibers or films as humidity-responsive materials to make them have humidity-responsive capabilities. However, so far, no composite films of nano-microcrystalline cellulose and nanofibers have been seen. Reported as a humidity sensitive responder
There are few flexible film composite materials prepared based on nanocrystalline cellulose, which are generally combined with resin film and nylon film, and the response performance is poor. It can only be judged by the slight change of color, which seriously limits its practical application.
And preparation steps are loaded down with trivial details, and required raw material is more expensive, affects its industrialization degree

Method used

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  • Nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and preparing method thereof
  • Nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and preparing method thereof
  • Nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a humidity-sensitive nano-microcrystalline cellulose nanofiber composite film, specifically comprising the following steps:

[0032] 1) Preparation of nanocrystalline cellulose suspension: cotton is added to 60wt% sulfuric acid solution to carry out acid hydrolysis reaction on cotton, the mass ratio of cotton to acid solution is 1:8, the temperature of acid hydrolysis reaction is 45 ℃, time After the reaction is completed, the reaction solution is centrifuged and washed with pure water, then dialyzed with pure water until the pH is stable, and finally diluted with water to obtain a nanocrystalline cellulose suspension with a concentration of 0.5% by mass;

[0033]2) Preparation of thermoplastic polymer nanofiber suspension: adding polyvinyl alcohol-ethylene copolymer (PVA-co-PE) nanofibers to the alcohol-water mixture, which is a mixture of n-propanol and water, And the mass ratio of alcohol to water is 7:3, and the nanofibers are broken up by a h...

Embodiment 2

[0038] A method for preparing a humidity-sensitive nano-microcrystalline cellulose nanofiber composite film, specifically comprising the following steps:

[0039] 1) Preparation of nano-microcrystalline cellulose suspension: join wood pulp in 65wt% sulfuric acid solution to carry out acid hydrolysis reaction to wood pulp, the mass ratio of wood pulp and acid solution is 1:8.75, the temperature of acid hydrolysis reaction is 50 ℃, the time is 40min, after the reaction is completed, the reaction solution is centrifuged first and washed with pure water, then dialyzed with pure water until the pH is stable, and finally diluted with water to obtain nanocrystalline cellulose with a mass percentage concentration of 2%. suspension;

[0040] 2) Preparation of thermoplastic polymer nanofiber suspension: adding polyamide (PA) nanofibers to the alcohol-water mixture, the alcohol-water mixture is a mixture of isopropanol and water, and the mass ratio of alcohol to water is 6 : 4, using a ...

Embodiment 3

[0046] A method for preparing a humidity-sensitive nano-microcrystalline cellulose nanofiber composite film, specifically comprising the following steps:

[0047] 1) Preparation of nanocrystalline cellulose suspension: sisal is added to 70wt% sulfuric acid solution to carry out acid hydrolysis reaction to sisal, the mass ratio of sisal to acid solution is 1:9, and the temperature of acid hydrolysis is 55 ℃, the time is 50min, after the reaction is completed, the reaction solution is centrifuged and washed with pure water, then dialyzed with pure water until the pH is stable, and finally diluted with water to obtain nanocrystalline cellulose with a mass percentage concentration of 3%. suspension;

[0048] 2) Preparation of thermoplastic polymer nanofiber suspension: Add polyethylene terephthalate (PET) nanofibers to the alcohol-water mixture, the alcohol-water mixture is a mixture of n-butanol and water, and the alcohol The mass ratio with water is 5:5, and the nanofibers are ...

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Abstract

The invention relates to the field of humidity sensor materials, in particular to a nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and a preparing method thereof. The preparing method of the nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity includes the following steps that cellulose is hydrolyzed by acid to prepare nanocrystalline cellulose suspension, then the nanocrystalline cellulose suspension and thermoplastic polymer nano-fiber suspension are mixed uniformly and then coated on the surface of a base material, a membrane layer is formed on the surface of the base material after drying, and the nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity is obtained after the base material is removed. The nanocrystalline cellulose nano-fiber composite membrane has the advantages of being high in humidity response speed and high in recovery speed.

Description

technical field [0001] The invention relates to the field of humidity sensor materials, in particular to a humidity-sensitive nano-microcrystalline cellulose nanofiber composite film and a preparation method thereof. Background technique [0002] Cellulose is a non-toxic and harmless natural polymer material with a wide range of sources. In addition to common wood, cotton, and hemp, microorganisms such as algae can also obtain cellulose. Cellulose is composed of D-glucopyranose. The basic structural unit is a linear polymer connected by β-1,4 glycosidic bonds. Cellulose is commonly treated by means of acid hydrolysis, alkali method, biological enzymatic hydrolysis, mechanical and physical treatment methods, etc., which can remove the non-crystalline region in the cellulose structure to prepare crystalline nanocellulose. As an emerging functional polymer material, crystalline nanocellulose has excellent physical and chemical properties, large specific surface area, high crys...

Claims

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Application Information

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IPC IPC(8): D04H1/4382
Inventor 王栋朱青王文钟卫兵金玉霞
Owner WUHAN TEXTILE UNIV
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