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A kind of anti-ultraviolet cellulose nanofiber reinforced composite film and preparation method thereof

A nanofiber-reinforced composite technology, which is applied in the field of UV-resistant cellulose nanofiber-reinforced composite membranes and its preparation, can solve problems such as cumbersome steps and harsh reaction conditions, and achieve good biocompatibility, simple modification methods, and good biocompatibility. The effect of practicality

Inactive Publication Date: 2020-04-17
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steps of some current surface modification methods are relatively cumbersome, and some reaction conditions are relatively harsh.

Method used

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  • A kind of anti-ultraviolet cellulose nanofiber reinforced composite film and preparation method thereof
  • A kind of anti-ultraviolet cellulose nanofiber reinforced composite film and preparation method thereof
  • A kind of anti-ultraviolet cellulose nanofiber reinforced composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of anti-ultraviolet cellulose nanofiber reinforced composite membrane is prepared by the following steps:

[0040] 1) Centrifuge 10g of cellulose nanofiber aqueous solution (0.5% mass fraction, 5-10nm diameter of cellulose nanofiber) in a desktop centrifuge at 12500rpm / min, wash with ethanol and acetone several times to remove water, and then use high-speed The disperser was dispersed in dimethyl sulfoxide in an ice-water bath at 15000 rpm; a modified cellulose nanofiber-dimethyl sulfoxide solution was obtained.

[0041] 2) Add 2-hydroxy-4-methoxybenzophenone and toluene diisocyanate at a molar ratio of 10:1 to 4 mL of dimethyl sulfoxide, and react for 1 hour at room temperature to obtain a coupling solution of isocyanate end groups; fiber Stir the cellulose nanofibers in dimethyl sulfoxide at room temperature at high speed for 2 hours; add the obtained coupling solution of isocyanate end groups to the cellulose nanofiber-dimethyl sulfoxide solution, and react fo...

Embodiment 2

[0046] A kind of anti-ultraviolet cellulose nanofiber reinforced composite membrane is prepared by the following steps:

[0047] 1) Centrifuge 10g of cellulose nanofiber aqueous solution (0.5% mass fraction, 5-10nm diameter of cellulose nanofiber) in a desktop centrifuge at 12500rpm / min, wash with ethanol and acetone several times to remove water, and then use high-speed The disperser was dispersed in dimethyl sulfoxide in an ice-water bath at 15000 rpm; a modified cellulose nanofiber-dimethyl sulfoxide solution was obtained.

[0048]2) Add 2-hydroxy-4-methoxybenzophenone and toluene diisocyanate at a molar ratio of 10:1 to 4 mL of dimethyl sulfoxide, and react for 2 hours at room temperature to obtain a coupling solution of isocyanate end groups; fiber Stir the cellulose nanofibers in dimethyl sulfoxide at room temperature at high speed for 2 hours; add the obtained coupling solution of isocyanate end groups to the cellulose nanofiber-dimethyl sulfoxide solution, and react fo...

Embodiment 3

[0053] A kind of anti-ultraviolet cellulose nanofiber reinforced composite membrane is prepared by the following steps:

[0054] 1) Centrifuge 10g of cellulose nanofiber aqueous solution (0.5% mass fraction, 5-10nm diameter of cellulose nanofiber) in a desktop centrifuge at 12500rpm / min, wash with ethanol and acetone several times to remove water, and then use high-speed The disperser was dispersed in dimethyl sulfoxide in an ice-water bath at 15000 rpm; a modified cellulose nanofiber-dimethyl sulfoxide solution was obtained.

[0055] 2) Add 2-hydroxy-4-methoxybenzophenone and toluene diisocyanate at a molar ratio of 10:1 to 4 mL of dimethyl sulfoxide, and react for 3 hours at room temperature to obtain a coupling solution of isocyanate end groups; fiber Stir the cellulose nanofibers in dimethyl sulfoxide at room temperature at high speed for 2 hours; add the obtained coupling solution of isocyanate end groups to the cellulose nanofiber-dimethyl sulfoxide solution, and react f...

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Abstract

The invention discloses an ultraviolet-proof cellulose nano-fiber enhanced composite film and a preparation method thereof. According to the composite film, a matrix is polyvinyl alcohol and an enhanced phase is modified cellulose nano-fibers. The preparation method comprises the following steps: firstly, preparing a coupling solution with an isocyanate terminal group; enabling the coupling solution and the cellulose nano-fibers dispersed in dimethyl sulfoxide to be subjected to esterification reaction at room temperature; after removing a superfluous coupling agent, mixing the modified cellulose nano-fibers with a polyvinyl alcohol water solution according to a certain mass ratio; drying in a drying oven to obtain the uniform and transparent composite film. According to the ultraviolet-proof cellulose nano-fiber enhanced composite film, raw materials are biomasses and have the advantages of biodegradable performance, good biocompatibility and the like. By adopting the ultraviolet-proof cellulose nano-fiber enhanced composite film, the disadvantage that the stability of a small molecular ultraviolet absorbent is poor is overcome; nanoparticles in the composite film are uniformly dispersed in the matrix so that the composite film has good mechanical properties and provides a remarkable protection effect on an ultraviolet band; meanwhile, the adding amount of the nanoparticles inthe film can be controlled to regulate and control an ultraviolet absorption effect. The ultraviolet-proof cellulose nano-fiber enhanced composite film has potential application value in industries including food packages, transportation, buildings and the like.

Description

technical field [0001] The invention relates to the technical field of anti-ultraviolet films, in particular to an anti-ultraviolet cellulose nanofiber reinforced composite film and a preparation method thereof. Background technique [0002] The depletion of the earth's resources and the deterioration of the ecological environment, especially the destruction of the ozone layer, have increased the ultraviolet radiation on the earth's surface. Excessive ultraviolet radiation will bring many negative effects to human health and living facilities, such as some skin damage, even induce skin cancer, decolorization of dyes and pigments, photoaging of some polymer materials, food corruption, loss of nutrients, etc. . Therefore, it is imminent to develop new materials to protect against ultraviolet light. [0003] In order to solve the problems caused by ultraviolet light, people choose some ultraviolet absorbers to add to the base material or choose paper, aluminum foil and other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L1/08C08J5/18
CPCC08J5/18C08J2329/04C08J2401/08
Inventor 潘晖牛逊刘雅婷宋阳
Owner NANJING FORESTRY UNIV