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Super-hydrophobic nano-cellulose membrane and preparation method thereof

A nano-cellulose, super-hydrophobic technology, applied in the direction of coating, etc., can solve the problems of limitations, mechanical properties of pure cellulose membrane materials, poor hydrophobicity, etc., and achieve the effect of low cost, high strength, and simple preparation process

Inactive Publication Date: 2019-10-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure cellulose membrane materials have poor mechanical properties and hydrophobic properties, which are greatly limited in practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Prepare film with cellulose nanocellulose:

[0038] ① Preparation of film-forming liquid: 0.5 parts of cellulose nanofibers, 99.5 parts of distilled water, blending and stirring for 5 minutes, ultrasonic dispersion to obtain film-forming liquid, ultrasonic power 600W, dispersion time 20 minutes;

[0039] ②Film preparation: pour the film-forming solution obtained in step ① onto the film-forming device to cast and dry to form a film. The film-forming condition temperature is 40°C, relative humidity is 40%, and the time is 24h;

[0040] ③Put the dried nanocellulose membrane into a 57% desiccator to balance for 3 days.

[0041] (2) modifying the nano-silica to obtain a super-hydrophobic nano-silica solution:

[0042] ① Blend 3 parts of nano-silica, 2 parts of modifier, and 100 parts of dispersant;

[0043] ②Put the mixed solution obtained in step ① into a water bath at a certain temperature to stir, the stirring temperature is 60° C., and the stirring time is 8 hours....

Embodiment 2

[0050] (1) Prepare film with cellulose nanocellulose:

[0051] ① Preparation of film-forming liquid: 0.5 parts of cellulose nanofibers, 99.5 parts of distilled water, blending and stirring for 5 minutes, ultrasonic dispersion to obtain film-forming liquid, ultrasonic power 600W, dispersion time 20 minutes;

[0052]②Film preparation: pour the film-forming solution obtained in step ① onto the film-forming device to cast and dry to form a film. The film-forming condition temperature is 45°C, relative humidity is 45%, and the time is 24h;

[0053] ③Put the dried nanocellulose membrane into a 57% desiccator to balance for 4 days.

[0054] (2) modifying the nano-silica to obtain a super-hydrophobic nano-silica solution:

[0055] ① Blend 4 parts of nano-silica, 3 parts of modifier, and 102 parts of dispersant;

[0056] ②Put the mixed solution obtained in step ① into a water bath at a certain temperature and stir, the stirring temperature is 60° C., and the stirring time is 10 h.

...

Embodiment 3

[0063] (1) Prepare film with cellulose nanocellulose:

[0064] ① Preparation of film-forming liquid: 0.5 parts of cellulose nanofibers, 99.5 parts of distilled water, blending and stirring for 5 minutes, ultrasonic dispersion to obtain film-forming liquid, ultrasonic power 600W, dispersion time 20 minutes;

[0065] ②Film preparation: pour the film-forming solution obtained in step ① onto the film-forming device to cast and dry to form a film. The film-forming condition temperature is 50°C, relative humidity is 50%, and the time is 24 hours;

[0066] ③Put the dried nanocellulose membrane into a 57% desiccator to balance for 3 days.

[0067] (2) modifying the nano-silica to obtain a super-hydrophobic nano-silica solution:

[0068] ① Blend 3 parts of nano-silica, 2 parts of modifier, and 100 parts of dispersant;

[0069] ②Put the mixed solution obtained in step ① into a water bath at a certain temperature to stir, the stirring temperature is 60° C., and the stirring time is 8 h...

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Abstract

The invention discloses a preparation method for preparing a super-hydrophobic nano-cellulose membrane by using a nano-cellulose membrane impregnated super-hydrophobic nano-silica suspension liquid. The preparation method of the super-hydrophobic nano-cellulose membrane comprises the following steps: (1) preparing a membrane by using cellulose nanofibers; (2) carrying out modification treatment onnano-silica to obtain a super-hydrophobic nano-silica solution; and (3) dipping the cellulose nanofiber membrane by using the super-hydrophobic nano-silica solution, putting the membrane into a drying oven for drying every time when dipping is finished, and repeatedly carrying out dipping and drying to obtain the super-hydrophobic nano-cellulose membrane. The super-hydrophobic nano-cellulose membrane has the advantages that the membrane is high in strength and low in cost, is free of pollution, can be completely degraded, has a simple preparation process, is hydrophobic and environmentally friendly, and can be applied to the fields of food packaging, degradable agricultural membranes, surface modification and the like.

Description

technical field [0001] The invention belongs to the technical fields of food packaging and surface modification, and in particular relates to a superhydrophobic nano-cellulose film and a preparation method thereof. Background technique [0002] At present, plastic packaging materials are the most widely used in the food packaging industry. Due to the good mechanical, water and gas barrier properties of plastics, and the current mature production technology, plastics are widely used in the packaging industry. However, the disadvantage of plastics being difficult to biodegrade leads to serious "white pollution", which endangers the ecosystem and seriously damages the environment. In addition, the cost of plastic processing is high, and the incineration process releases a large amount of harmful gases, which has become a problem that governments of all countries need to deal with urgently. [0003] Since the 1970s, scientists from various countries have turned their research a...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J5/18C09D1/00C08L1/02C08L1/04
CPCC08J5/18C08J7/06C08J2301/02C08J2301/04C09D1/00
Inventor 秦志永黄嘉雯廖木荣孙仪冯小琼卢禹彤
Owner GUANGXI UNIV
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