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Highly-transparent anti-ultraviolet nano-cellulose composite film and production method thereof

A nanocellulose and nanofiber technology is applied in the field of highly transparent UV-resistant nanocellulose composite film and its preparation, which can solve the problems of cumbersome steps and harsh reaction conditions, and achieves high-efficiency UV absorption, simple modification method, and mechanical properties. excellent effect

Active Publication Date: 2018-12-18
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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  • Highly-transparent anti-ultraviolet nano-cellulose composite film and production method thereof
  • Highly-transparent anti-ultraviolet nano-cellulose composite film and production method thereof
  • Highly-transparent anti-ultraviolet nano-cellulose composite film and production method thereof

Examples

Experimental program
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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 anti-ultraviolet nano-cellulose composite film and a production method thereof. The matrix of the composite film is polyvinyl alcohol, and a reinforcing phase is modified cellulose nano-fibers. The production method comprises the following steps: preparing cellulose nano-fibers modified with 2-hydroxy-4-methoxybenzophenone and epoxidized soybean oil; and mixing the modified cellulose nano-fibers with a polyvinyl alcohol-water solution according to a certain mass ratio, and drying the obtained mixture in an oven to obtain the uniform and transparentcomposite film. Raw materials in the invention are derived from biomass, so the composite film is biodegradable, and has good biocompatibility. The shortcoming of poor stability of a small-molecule ultraviolet absorbent is overcome, and the epoxidized soybean oil can be used as a plasticizer to increase the flexibility of the composite film. Nano-particles in the composite film are uniformly dispersed in the matrix, the composite film has a high transparency and can provide a significant anti-ultraviolet effect, and the ultraviolet protection effect can be controlled by controlling the addition amount of the nano-particles 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 Applications(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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