Method for regulating and controlling photoelectric haze and ultraviolet filtration effect of modified nano-cellulose film

A nanocellulose and filtration technology, which is applied in the field of biomass optoelectronic nanomaterials, can solve the problem that the haze value of nanocellulose films cannot be regulated, and achieves enhanced ultraviolet filtration performance, increased use range, and good application prospects. Effect

Active Publication Date: 2019-03-01
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the haze value of the nanocellulose film cannot be adjusted, and increase its filtering performance for ultraviolet rays, and provide a method for regulating the photoelectric haze and ultraviolet filtering effect of the modified nanocellulose film

Method used

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  • Method for regulating and controlling photoelectric haze and ultraviolet filtration effect of modified nano-cellulose film
  • Method for regulating and controlling photoelectric haze and ultraviolet filtration effect of modified nano-cellulose film
  • Method for regulating and controlling photoelectric haze and ultraviolet filtration effect of modified nano-cellulose film

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preparation example Construction

[0033] (3) Preparation of modified nanocellulose film

[0034] Take 12-36 mg of TEMPO-oxidized cellulose nanofibers dry, ultrasonically disperse them in 10-30 mL of deionized water, then weigh 3-9 mg of modifier Zn(II) terpyridine complex and dissolve them in 2-6 ml of dimethyl sulfoxide solution, then mixed and stirred for 12 to 24 hours. Vacuum filtration is carried out to obtain a modified nanocellulose film, that is, a modified nanopaper.

[0035] The reaction formula is shown below.

[0036]

[0037](4) Treatment of nanocellulose films with different solvents

[0038] (401) Treating Unmodified Nanocellulose Films with Different Solvents

[0039] Put the unmodified nanocellulose film in a weighing bottle, add 10-50ml of solvent, take it out after soaking for 10-60min, remove excess solvent, and obtain the unmodified nanocellulose film after solvent treatment.

[0040] (402) Treatment of modified nanocellulose films with different solvents

[0041] Put the modified ...

Embodiment 1

[0048] Weigh 3g of dry bleached coniferous wood fibers in deionized water, and shear at high speed for 5min, so that the fibers are evenly dispersed in the water. Add TEMPO (0.01mmol / g) and NaBr (6.0mmol / g) aqueous solutions in turn, add NaOH aqueous solution to adjust the pH value to 10, then add NaClO (6.0mmol / g) solution to the system, and stir for 3h. After the reaction is completed, the pH of the reaction solution is adjusted to neutral by dilute hydrochloric acid to obtain a TEMPO-oxidized cellulose suspension. Wash with deionized water until neutral, adjust to a concentration of 0.03 wt% cellulose suspension, perform high-pressure homogenization treatment, and homogenize 40 times under a pressure of 60 MPa to obtain TEMPO-oxidized cellulose nanofibers.

[0049] 5mmol (0.98g) of 3,4,5-trimethoxybenzaldehyde and 10mmol (7.7g) of KOH particles were dissolved in 50ml of ethanol solution, and then 10mmol (1.2g) of 2-acetylpyridine was added dropwise. The solution was stirre...

Embodiment 2

[0062] Put 5 pieces of modified nanocellulose films in benzyl alcohol treatment respectively, but the soaking time is 0, 30min, 90min, 120min and 150min respectively, remove excess benzyl alcohol solvent, and obtain modified nanocellulose after benzyl alcohol solvent treatment. Thin film, carry out light transmittance test, obtain ultraviolet-visible light transmittance spectrum, the result is as follows image 3 shown. From image 3 It can be seen that compared with the modified nanocellulose film without benzyl alcohol treatment, the absorption of the modified nanocellulose film treated with benzyl alcohol in the ultraviolet region is significantly reduced, indicating that after solvent treatment, it has high efficiency. Ultraviolet filtration performance, and with the prolongation of treatment time, the ultraviolet filtration performance is also continuously enhanced, which is due to the increase of haze with the prolongation of treatment time, that is to say, the increase...

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Abstract

The invention provides a method for regulating and controlling photoelectric haze and an ultraviolet filtration effect of a modified nano-cellulose film. The modified nano-cellulose film is obtained by modifying TEMPO-oxidized cellulose nanofiber through a Zn(II) terpyridine complex; the modified nano-cellulose film is put into an alcohol solvent, soaked and then taken out, excessive solvents areremoved, and thus the modified nano-cellulose film subjected to solvent treatment is obtained; and then the modified nano-cellulose film subjected to solvent treatment is put into water, soaked for 10-150 min and then taken out, excessive water is removed, and thus the modified nano-cellulose film subjected to water treatment is obtained. According to the method, the haze value of the modified nano-cellulose film can be regulated and controlled through alcohol treatment, specifically, after alcohol treatment, the haze is increased, ultraviolet filtration performance is improved, the modified nano-cellulose film can be subjected to haze adjusting according to the different needs, and the using range of the modified nano-cellulose film is expanded.

Description

technical field [0001] The invention belongs to the field of biomass optoelectronic nanomaterials, and in particular relates to a method for regulating and controlling the optoelectronic haze and ultraviolet filtering effect of a modified nanocellulose film. Background technique [0002] Cellulose nanofibers, also called nanocellulose, are separated from the most widely distributed renewable resources on the earth - the cell walls of plant fibers, which are subjected to very large mechanical forces or pretreated Combined with the action of mechanical force, it is a cellulose functional material with a diameter of nanometers and a length of micrometers. Cellulose nanofibers have high strength, stiffness (modulus up to 138GPa), large specific surface area (up to 50m 2 / g), extremely low coefficient of thermal expansion (CTE, 0.1ppm / k, close to quartz). According to different treatment methods for plant fibers, cellulose nanofibers are usually cellulose nanomaterials with a d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08L1/02
CPCC08J7/12C08J2301/02
Inventor 张召张蒙李新平宋发发薛白亮
Owner SHAANXI UNIV OF SCI & TECH
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