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Wavelength-controllable cellulose iridescent film and preparation method thereof

A cellulose and iridescent film technology, which is applied in the field of preparation of functional film materials, can solve the problems of high cost, high energy consumption, and unsuitability for large-scale production of enterprises, and achieve the effects of low cost, convenient operation, and time-saving preparation

Active Publication Date: 2021-01-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this achieves wavelength controllability to a certain extent, the purely mechanical energy input method consumes high energy and costs a lot, and is not suitable for large-scale production of enterprises.

Method used

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  • Wavelength-controllable cellulose iridescent film and preparation method thereof
  • Wavelength-controllable cellulose iridescent film and preparation method thereof
  • Wavelength-controllable cellulose iridescent film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a wavelength controllable cellulose iridescent film containing lactic acid solution and glucose solution, comprising the steps of:

[0043] (1) 20 g of dry coniferous wood pulp is mixed with 200 ml of concentrated sulfuric acid solution with a concentration of 60 wt %, stirred at a speed of 400 r / min for 50 min at 50 ° C, and deionized water with 10 times the volume of concentrated sulfuric acid solution is added to terminate the reaction to obtain white milky solution;

[0044] (2) Centrifuge the white milky solution described in step (1) at a speed of 10,000 r / min for 10 min at 10° C., take the upper suspension, centrifuge 3 times, and combine the suspension;

[0045] (3) Pour the suspension described in step (2) into a dialysis bag with a molecular weight of 14000, and dialyze with deionized water until the suspension is neutral;

[0046] (4) The neutral suspension obtained in step (3) is concentrated by rotary steaming, the temperature of th...

Embodiment 2

[0050] A preparation method of a wavelength controllable cellulose iridescent film containing lactic acid solution and glucose solution, comprising the steps of:

[0051] (1) 20 g of dry coniferous wood pulp and 160 ml of concentrated sulfuric acid solution with a concentration of 70 wt % were stirred at 45 ° C for 55 minutes at a speed of 300 r / min, and deionized water with 10 times the volume of the concentrated sulfuric acid solution was added to terminate the reaction to obtain a white milky solution;

[0052](2) Centrifuge the white milky solution described in step (1) at a speed of 8000 r / min at 0°C for 12 minutes, take the upper layer suspension, repeat the centrifugation 4 times, and combine the suspension;

[0053] (3) Pour the suspension described in step (2) into a dialysis bag with a molecular weight of 14000, and dialyze with deionized water until the suspension is neutral;

[0054] (4) The neutral suspension obtained in step (3) is concentrated by rotary steamin...

Embodiment 3

[0058] A preparation method of a wavelength controllable cellulose iridescent film containing lactic acid solution and glucose solution, comprising the steps of:

[0059] (1) 20 g of dry coniferous wood pulp is mixed with 180 ml of concentrated sulfuric acid solution with a concentration of 64 wt %, stirred at 350 r / min for 45 min at 55 ° C, and deionized water with 10 times the volume of concentrated sulfuric acid solution is added to terminate the reaction to obtain white milky solution;

[0060] (2) Centrifuge the white milky solution described in step (1) at a speed of 10,000 r / min for 11 minutes at 5° C., take the upper layer suspension, repeat the centrifugation for 3 times, and combine the suspension;

[0061] (3) Pour the suspension described in step (2) into a dialysis bag with a molecular weight of 14000, and dialyze with deionized water until the suspension is neutral;

[0062] (4) Concentrate the neutral suspension obtained in step (3) by rotary steaming, the temp...

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Abstract

The invention belongs to the technical field of functional film materials, and discloses a wavelength-controllable cellulose iridescent film and a preparation method thereof. The method comprises thefollowing steps: (1) uniformly mixing CNC suspension with a lactic acid solution and a glucose solution to obtain a CNC / lactic acid / glucose mixed solution; wherein the CNC suspension liquid is cellulose nanocrystalline suspension liquid; and (2) drying the CNC / lactic acid / glucose mixed solution to form a film, thereby obtaining the cellulose iridescent film. The method is simple and low in cost. According to the invention, by adding lactic acid and glucose, the prepared film has iridescent film characteristics; and the wavelength of the iridescent film is in a visible light region, and the wavelength of different colors of the iridescent film is controllable.

Description

technical field [0001] The invention belongs to the field of preparation of functional film materials, and in particular relates to a cellulose iridescent film with controllable wavelength and a preparation method thereof. Background technique [0002] Cellulose, as the main component of plant cell walls, is a renewable polysaccharide with the widest distribution and highest content in nature. It has excellent biocompatibility and biodegradability, so it is widely used in the preparation and research of functional materials. [0003] Cellulose nanocrystals (CNC) refer to highly crystalline rod-shaped nanoscale cellulose crystals prepared by removing part of the non-crystalline region in natural cellulose fibers by hydrolysis or enzymolysis. It has high modulus, high strength and High crystallinity and other characteristics, while having the advantages of light weight, non-toxic, renewable, degradable and biocompatibility of biological materials. [0004] CNC is prepared by ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/04C08K5/1545C08K5/09
CPCC08J5/18C08J2301/04C08K5/1545C08K5/09C08L1/02C08L1/12C08L1/10C08K2003/309C08K2201/016C08K2201/011C08K3/30C08J2301/02C08J7/02C08J7/14C08L2201/54C08L2203/16
Inventor 王斌曾劲松陈克复段承良程峥李金鹏
Owner SOUTH CHINA UNIV OF TECH
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