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Preparation method of crosslinked nano-cellulose/hexagonal boron nitride nanosheet composite film

A technology of nanocellulose and hexagonal boron nitride, which is applied in the field of preparation of cross-linked nanocellulose/hexagonal boron nitride nanosheet composite films, can solve the problems of structural defects and large gaps of composite layers, and achieves increased density, High breakdown strength, the effect of increasing the density

Active Publication Date: 2018-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the addition of inorganic fillers usually introduces structural defects, making the composite layer gap larger

Method used

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  • Preparation method of crosslinked nano-cellulose/hexagonal boron nitride nanosheet composite film
  • Preparation method of crosslinked nano-cellulose/hexagonal boron nitride nanosheet composite film
  • Preparation method of crosslinked nano-cellulose/hexagonal boron nitride nanosheet composite film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of crosslinked nanocellulose / hexagonal boron nitride nanosheet composite film, the steps are as follows:

[0050] 1) Preparation of TOCN dispersion: Take 0.01g TEMPO and 0.1g NaBr, add them together to 1000mL deionized water, stir magnetically at 10°C and 300r / min for 10min to make it fully mixed until TEMPO and NaBr are completely dissolved, and then add to the above system Add 1g of cotton linters to the system, then add 0.1g NaClO to the system, keep the pH of the system at 9 by dropwise adding 0.1mol / L NaOH solution, and filter the oxidized cellulose after reacting at 10°C for 5h. Then wash with deionized water for more than 3 times, and dry to obtain TEMPO oxidized cellulose; then put it into a beaker, add deionized water to disperse, then mechanically stir for 6 minutes and ultrasonically treat for 12 minutes to obtain nanocellulose with a concentration of 0.3%. Dispersion liquid, namely 0.3% TOCN dispersion liquid;

[0051] 2) Preparation of BNNS: Ad...

Embodiment 2

[0057] Preparation of crosslinked nanocellulose / hexagonal boron nitride nanosheet composite film, the steps are as follows:

[0058] 1) Preparation of TOCN dispersion: Take 0.01g TEMPO and 0.01g NaBr, add them together to 100mL deionized water, stir magnetically at 30°C and 600r / min for 20min to make it fully mixed until TEMPO and NaBr are completely dissolved, and then add to the above system Add 0.1g of softwood bleached pulp to the system, then add 1g of NaClO to the system, keep the pH of the system at 11 by adding 0.5mol / L NaOH solution dropwise, react at 30°C for 7h, filter the oxidized cellulose, and then Wash with deionized water for more than 3 times, dry to obtain TEMPO oxidized cellulose; then put it into a beaker, add deionized water to disperse, then mechanically stir for 6 minutes and ultrasonically treat for 6 minutes to obtain nanocellulose dispersion with a concentration of 0.5%. Liquid, that is, 0.5% TOCN dispersion;

[0059] 2) Preparation of BNNS: Add 30ml...

Embodiment 3

[0064] Preparation of crosslinked nanocellulose / hexagonal boron nitride nanosheet composite film, the steps are as follows:

[0065] 1) Preparation of TOCN dispersion: Take 0.02g TEMPO and 0.05g NaBr, add them together into 1000mL deionized water, stir magnetically at 15°C and 400r / min for 15min to make them fully mixed until TEMPO and NaBr are completely dissolved, and then add to the above system Add 1g of bacterial cellulose to the system, then add 1.5g of NaClO to the system, keep the pH of the system at 10 by dropping 0.2mol / L NaOH solution, react at 15°C for 6h, filter the oxidized cellulose, and then Wash with deionized water for more than 3 times, dry to obtain TEMPO oxidized cellulose; then put it into a beaker, add deionized water to disperse, then mechanically stir for 6 minutes and ultrasonically treat for 12 minutes to obtain a nanocellulose dispersion with a concentration of 0.2%. Liquid, that is, 0.2% TOCN dispersion;

[0066] 2) Preparation of BNNS: Add 35ml tri...

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Abstract

The invention discloses a preparation method of a crosslinked nano-cellulose / hexagonal boron nitride nanosheet composite film. The composite film is prepared by the steps of compositing nano-cellulosewith diameter of 2nm-20nm and length of 100nm-5micron with a hexagonal boron nitride nanosheet with excellent dielectric property, and soaking into a polyvalent metal salt solution. The composite film provided by the invention has relatively low dielectric loss and relatively high disruptive strength, energy storage density and energy storage efficiency. Besides, the composite film further has agood stratified structure, and the thermal stability of the composite film is remarkably improved after crosslinking. The composite film has wide and highly-potential application prospects in the application of dielectric energy storage.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a crosslinked nanocellulose / hexagonal boron nitride nanosheet composite film. Background technique [0002] Cellulose is the most abundant natural polymer in nature, which provides a wide range of sources for the acquisition of nanocellulose, and also makes nanocellulose have the advantages of low cost and large output; in addition, the nanocellulose membrane is flexible and transparent. With high light efficiency and good compactness, it is an ideal material as a substrate for energy storage materials. At present, the raw materials for the preparation of nanocellulose are mainly plants, and the natural cellulose in higher plants is wrapped in the plant cell wall and has intricate connections with the cell wall, which makes it difficult to peel off the cellulose. , have found a variety of methods for the preparation of nanocellulos...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J7/12C08L1/02C08K9/00C08K7/00C08K3/38
CPCC08J5/18C08J7/12C08J2301/02C08K7/00C08K9/00C08K2003/385C08K2201/011
Inventor 杨全岭詹阳陈浩杨俊伟石竹群熊传溪
Owner WUHAN UNIV OF TECH
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