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A kind of cellulose nanocrystal/borax composite film and preparation method thereof

A composite film and nanocrystal technology, applied in the field of cellulose nanocrystal/borax composite film and its preparation, can solve the problem of no composite film and the like, and achieve the effects of low price, wide source and improved mechanical properties

Active Publication Date: 2022-03-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Borax (NaB 4 o 7 10H 2 O), is a strong base and weak acid salt, which is biocompatible and will ionize B(OH) in water 4 - , theoretically can combine with hydroxyl groups in cellulose nanocrystals to form covalent bonds, and as a cross-linking agent can significantly enhance the mechanical properties of cellulose nanocrystals / borax composites, but there is no borax and cellulose nanocrystals Report on Preparation of Composite Thin Films by Crystal Bonding

Method used

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  • A kind of cellulose nanocrystal/borax composite film and preparation method thereof
  • A kind of cellulose nanocrystal/borax composite film and preparation method thereof
  • A kind of cellulose nanocrystal/borax composite film and preparation method thereof

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preparation example Construction

[0024] The preparation method of a kind of cellulose nanocrystal / borax composite film of the present invention, at first selects cheap and biocompatible borax as cross-linking agent, uses cellulose nanocrystal as matrix, obtains high-strength fiber by vacuum suction method Prime nanocrystalline / borax composite film, the specific steps are as follows:

[0025] Step 1, take 5-10mL of cellulose nanocrystal / water dispersion with a concentration of 1wt.%, and dilute it to 50-100mL with deionized water to obtain a cellulose nanocrystal / water dispersion with a concentration of 0.05-0.2wt.%. ,spare;

[0026] Step 2, weigh 19.1~38.1g of borax (Na 2 B 4 o 7 10H 2 (0) and the deionized water of 491~991mL, mix uniformly, the borax aqueous solution that configuration concentration is 0.05~0.2mol / L, standby;

[0027] Step 3, magnetically stir the dispersion prepared in step 1 for 1 to 3 hours and disperse evenly, then add 6.67 to 33.35 mL of the borax aqueous solution prepared in step ...

Embodiment 1

[0030] Step 1, take 5mL of cellulose nanocrystal / water dispersion with a concentration of 1wt.%, dilute to 50mL with deionized water to obtain a cellulose nanocrystal / water dispersion with a concentration of 0.1wt.%, and set aside;

[0031] Step 2, weigh the borax (Na 2 B 4 o 7 10H 2 (2) and the deionized water of 982mL, mix homogeneously, configuration concentration is the borax aqueous solution of 0.1mol / L, for subsequent use;

[0032] Step 3, magnetically stir the dispersion liquid prepared in step 1 for 2 h, then add 6.67 mL of the borax aqueous solution prepared in step 2 dropwise, and ultrasonically stir the mixed dispersion liquid obtained above for 30 min, then fully magnetically stir for 24 h;

[0033] Step 4: Vacuum filter the cellulose nanocrystal / borax dispersion prepared in step 3 for 4 hours to obtain a wet gel, then press in an oil press for 3 minutes, and dry at 105°C for 10 minutes to prepare a cellulose nanocrystal / borax composite film .

Embodiment 2

[0040] Step 1, obtain 100mL of cellulose nanocrystal / water dispersion with a concentration of 0.2wt.%, and set aside;

[0041] Step 2, configuration concentration is the borax aqueous solution of 0.2mol / L, standby;

[0042] Step 3, magnetically stir the dispersion liquid in step 1 for 1 h, then add 33.35 mL of the borax aqueous solution prepared in step 2 dropwise, and ultrasonicate the mixed dispersion liquid obtained above for 10 min, then fully magnetically stir for 20 h;

[0043] Step 4: Vacuum filter the cellulose nanocrystal / borax dispersion prepared in step 3 for 8 hours to obtain a wet gel, then press it in an oil press for 7 minutes, and dry it at 60°C for 30 minutes to prepare a cellulose nanocrystal / borax composite film .

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Abstract

The invention provides a cellulose nanocrystal / borax composite film and a preparation method thereof, and relates to the technical field of nanofilm preparation. The method comprises the following steps, step 1, adding a borax aqueous solution to the cellulose nanocrystal / water dispersion , after uniform dispersion to obtain dispersion A; step 2, the dispersion A is suction filtered to obtain a wet gel, and the wet gel is pressed and then dried to obtain a cellulose nanocrystal / borax composite film. By adding borax aqueous solution to the cellulose nanocrystal / water dispersion, the adjacent cellulose nanocrystal molecular chains can be crosslinked through covalent bonds, and the interfacial bonding of the cellulose nanocrystal film crosslinked by borax can be greatly improved. The reinforcement effectively improves the mechanical properties of cellulose nanocrystalline film, further expanding its application in the field of flexible electronics and smart packaging.

Description

technical field [0001] The invention relates to the technical field of nano film preparation, in particular to a cellulose nano crystal / borax composite film and a preparation method thereof. Background technique [0002] Nanocellulose can be divided into nanofibrillated fibers and cellulose nanocrystals. Because of its renewability, biodegradability, excellent thermal stability, high specific surface area and abundant active groups, it is widely used in the field of flexible electronics. , smart packaging, biomedicine, military industry, construction and other fields have great application potential. The preparation and application of nanocellulose has become a hot spot in current global academic research. However, cellulose nanocrystals have a diameter of several to tens of nanometers and a length of several hundred nanometers, with a low aspect ratio. Therefore, the strength of the pure cellulose nanocrystalline film is relatively low, which limits its further application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08K3/38C08J5/18C08J3/24
CPCC08J5/18C08J3/24C08J2301/04C08K2003/387
Inventor 陆赵情宁逗逗俄松峰黄吉振金崭凡马秦杨凯伦
Owner SHAANXI UNIV OF SCI & TECH