A highly transparent anti-ultraviolet nano-cellulose composite film and its preparation method

A nanocellulose and nanofiber technology, applied in the field of highly transparent UV-resistant nanocellulose composite film and its preparation, can solve the problems of harsh reaction conditions and cumbersome steps, and achieve simple modification methods, high-efficiency UV absorption, and extended use The effect of longevity

Active Publication Date: 2021-03-09
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 highly transparent anti-ultraviolet nano-cellulose composite film and its preparation method
  • A highly transparent anti-ultraviolet nano-cellulose composite film and its preparation method
  • A highly transparent anti-ultraviolet nano-cellulose composite film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A highly transparent anti-ultraviolet nano-cellulose composite film is prepared by the following steps:

[0040] 1) The cellulose nanofiber aqueous solution with a mass percentage concentration of 0.1% is centrifuged and washed with ethanol and acetone several times to remove water, and redispersed in dimethyl sulfoxide with a mass percentage concentration of 0.1%;

[0041] 2) Add 2-hydroxy-4-methoxybenzophenone and epoxidized soybean oil to the product obtained in step 1), continue to pass nitrogen, control the temperature at 120°C, and react for 1 hour; wherein, 2-hydroxy-4 - the mass ratio of methoxybenzophenone and epoxidized soybean oil is 1: 1, and the mass ratio of cellulose nanofibers and 2-hydroxyl-4-methoxybenzophenone is 1: 1;

[0042] 3) After the reaction in step 2), acetone was added to the reacted mixture, stirred at a high speed, and then centrifuged at a speed of 12500 r / min in a desktop centrifuge. Wash away excess 2-hydroxy-4-methoxybenzophenone and ...

Embodiment 2

[0046] A highly transparent anti-ultraviolet nano-cellulose composite film is prepared by the following steps:

[0047] 1) The cellulose nanofiber aqueous solution with a mass percentage concentration of 0.25% is centrifuged and washed with ethanol and acetone several times to remove water, and redispersed in dimethyl sulfoxide with a mass percentage concentration of 0.25%;

[0048] 2) Add 2-hydroxy-4-methoxybenzophenone and epoxidized soybean oil to the product obtained in step 1), continue to pass nitrogen, control the temperature at 120°C, and react for 1 hour; wherein, 2-hydroxy-4 - the mass ratio of methoxybenzophenone and epoxidized soybean oil is 1: 1, and the mass ratio of cellulose nanofibers and 2-hydroxyl-4-methoxybenzophenone is 1: 1;

[0049] 3) After the reaction in step 2), acetone was added to the reacted mixture, stirred at a high speed, and then centrifuged at a speed of 12500 r / min in a desktop centrifuge. Wash away excess 2-hydroxy-4-methoxybenzophenone an...

Embodiment 3

[0053] A highly transparent anti-ultraviolet nano-cellulose composite film is prepared by the following steps:

[0054] 1) The cellulose nanofiber aqueous solution with a mass percentage concentration of 0.5% is centrifuged with ethanol and acetone to remove water, and redispersed in dimethyl sulfoxide with a mass percentage concentration of 0.5%;

[0055] 2) Add 2-hydroxy-4-methoxybenzophenone and epoxidized soybean oil to the product obtained in step 1), continue to pass nitrogen, control the temperature at 120°C, and react for 1 hour; wherein, 2-hydroxy-4 - the mass ratio of methoxybenzophenone and epoxidized soybean oil is 1: 1, and the mass ratio of cellulose nanofibers and 2-hydroxyl-4-methoxybenzophenone is 1: 1;

[0056] 3) After the reaction in step 2), acetone was added to the reacted mixture, stirred at a high speed, and then centrifuged at a speed of 12500 r / min in a desktop centrifuge. Wash away excess 2-hydroxy-4-methoxybenzophenone and epoxidized soybean oil wi...

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Abstract

The invention discloses a highly transparent ultraviolet-proof nano-cellulose composite film and a preparation method thereof. The matrix of the composite membrane is polyvinyl alcohol, and the reinforcing phase is modified cellulose nanofiber. Firstly, cellulose nanofibers modified with 2‑hydroxy‑4‑methoxybenzophenone and epoxidized soybean oil were prepared. The modified cellulose nanofiber is mixed with a polyvinyl alcohol aqueous solution according to a certain mass ratio, and dried in an oven to obtain a uniform and transparent composite film. The raw materials in this application are derived from biomass, and have the advantages of biodegradability and good biocompatibility. The invention overcomes the shortcoming of poor stability of the small molecule ultraviolet absorber, and at the same time, the epoxidized soybean oil can be used as a plasticizer to increase the flexibility of the composite film. The nanoparticles in the composite film are uniformly dispersed in the matrix, have high transparency and can provide significant UV protection effect, and the UV protection effect can be regulated by controlling the amount of nanoparticles added in the film.

Description

technical field [0001] The invention relates to a preparation technology of a biodegradable UV-resistant film, in particular to a highly transparent UV-resistant nano-cellulose composite film and a preparation method thereof. Background technique [0002] Ultraviolet light mainly includes wavelengths divided into three categories: UVC (220-280nm), UVB (280-320nm) and UVA (320-400nm). UVC is mainly absorbed by the ozone layer before reaching the ground, so its impact is negligible. However, UV-generated radiation can cause serious skin health concerns and can activate chromophores in industrial coatings or packaging materials to facilitate photodegradation of polymers. Therefore, UV protection materials have received extensive attention, and tin foil and various papers have been applied to packaging to improve light scattering capabilities, which also sacrifices the functionality and aesthetics of commodities. Fabrication of optically transparent and UV-shielding polymer co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L1/02C08L91/00C08K5/132C08J5/18
CPCC08J5/18C08J2329/04C08J2401/02C08J2491/00
Inventor 潘晖牛逊陈伟刘雅婷
Owner NANJING FORESTRY UNIV
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