Cellulose nanocrystal/graphene composite colored film and fast preparation method thereof

A graphene composite and nanocrystal technology, applied in the field of color film and its rapid preparation, solid color film preparation based on cellulose nanocrystal, to achieve good film-forming properties, shorten film-forming time, and smooth film surface

Active Publication Date: 2014-07-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another method of using cellulose nanocrystals to prepare films is to compound them with other materials, but there is no report or invention involving the preparation of colorful cellulose nanocrystal composite films

Method used

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  • Cellulose nanocrystal/graphene composite colored film and fast preparation method thereof
  • Cellulose nanocrystal/graphene composite colored film and fast preparation method thereof
  • Cellulose nanocrystal/graphene composite colored film and fast preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 90 ml of 64wt% sulfuric acid to 5 grams of pulp cellulose, stir at 50°C for 1.5 h, then add deionized water to terminate the reaction, and after the solution is allowed to stand, centrifuge at a speed of 9000 rpm / min for 20 min with a high-speed centrifuge. The pellet was then washed and separated again until the supernatant became cloudy. The obtained cellulose nanocrystal suspension was sonicated in an ice-water bath, and stored at 4°C for future use. Dilute the prepared cellulose nanocrystal suspension to 1wt%, take 30 ml of the diluted nanocrystal suspension liquid and compound it with 0.9 mg of graphene, and ultrasonicate for 15 hours. After TRG is evenly dispersed in the solution, the obtained cellulose nanocrystal The crystal / graphene composite solution is filtered by a vacuum filtration device to form a film, and the graphene content in the prepared composite film is 0.3%. For the picture of the film, see figure 1 .

Embodiment 2

[0056] The type of material used, the amount and the process flow are the same as in Example 1, except that after diluting the prepared cellulose nanocrystal suspension to 1 wt%, 30 milliliters of the diluted nanocrystal suspension is compounded with 1.5 milligrams of graphene, Ultrasound and suction filtration are then used to form a film, and the graphene content in the prepared composite film is 0.5%.

Embodiment 3

[0058] The type of material used, the amount and the process flow are the same as in Example 1, except that after diluting the prepared cellulose nanocrystal suspension to 1 wt%, 30 milliliters of the diluted nanocrystal suspension is compounded with 3 milligrams of graphene, Ultrasound and suction filtration are then used to form a film, and the graphene content in the prepared composite film is 1%.

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Abstract

The invention relates to a cellulose nanocrystal/graphene composite colored film and a fast preparation method thereof. The cellulose nanocrystal/graphene composite colored film can be prepared under the existence of a flow field by adopting a vacuum filtration method, the composite film has a cholesteric liquid crystal phase structure, and the color of the composite film can be regulated by controlling the ultrasonic time during preparation process. The prepared colored film can absorb water, and the color can be changed along with the change of humidity. The cellulose nanocrystal/graphene composite colored film has application values in the photoelectric field and the preparation of anti-counterfeit labels, anti-counterfeit paper and high-grade discoloring anti-counterfeit ink.

Description

【Technical field】 [0001] The invention relates to a color film compounded by cellulose nanocrystal / graphene and a rapid preparation method thereof, in particular to a preparation method of a solid color film based on cellulose nanocrystal (CNC), which belongs to the technical field of film preparation. 【Background technique】 [0002] Cellulose is one of the most abundant organic matter on the earth, and it is an inexhaustible and inexhaustible renewable resource in nature. Graphene, as a perfect two-dimensional carbon material, has attracted extensive attention due to its excellent electrical conductivity, optical properties, mechanical properties, and heat resistance, and has been widely used in the field of optoelectronics. [0003] The cellulose nanocrystals prepared by sulfuric acid acid hydrolysis can be arranged into cholesteric liquid crystals in aqueous solution because of the grafted sulfonate groups on the surface. ability. The preparation of cellulose nanocrysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K3/04C08J5/18
Inventor 段咏欣陈琪张建明周丽娟
Owner QINGDAO UNIV OF SCI & TECH
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