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A kind of high-strength transparent hydrophobic cellulose nano film and preparation method thereof

A cellulose and hydrophobic technology, which is applied in the field of high-strength transparent hydrophobic cellulose nano-membrane and its preparation, can solve the problems of high cost, high production cost, unfriendly environment, etc., achieve improved film-forming performance, low equipment requirements, Inexpensive effect

Active Publication Date: 2021-02-09
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These treatment methods generally require heating or long treatment time, and sometimes need to add some toxic chemical reagents, and the treatment efficiency is not high, so it is difficult to produce on a large scale
[0006] To sum up, there are still many problems in the process of cellulose nanotechnology that hinder its large-scale production and application, such as: long pretreatment cycle, not green, expensive and difficult to recycle chemicals, high preparation costs, etc.
In addition, the cellulose nanomembranes prepared by traditional methods have poor water resistance and are not easy to use in humid environments.
Complicated, costly or environmentally unfriendly post-processing is required for hydrophobic modification

Method used

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  • A kind of high-strength transparent hydrophobic cellulose nano film and preparation method thereof
  • A kind of high-strength transparent hydrophobic cellulose nano film and preparation method thereof
  • A kind of high-strength transparent hydrophobic cellulose nano film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation of high-strength transparent cellulose nano-film with commercial bleached coniferous wood paddle board mainly includes the following steps:

[0040] 1) Disperse the bleached coniferous wood paddles with a pulverizer, then take 50 g of the disintegrated raw materials and place them in a reaction kettle, and add 1000 mL of 88 wt % formic acid solution. Then hydrolyze at 100°C for 6 hours, adjust the stirring speed to 600 rpm, cool to room temperature after the reaction, and separate the solid and liquid by suction filtration. The separated solid continues to be filtered and washed with water until neutral cellulose solid is obtained; the separated liquid is distilled under reduced pressure to recover formic acid, and at the same time, the sugar in the liquid can be recovered.

[0041] 2) Replace the washed cellulose solid solvent into DMAC, and adjust the mass concentration of its cellulose DMAC suspension to 0.2 wt%; the DMAC replacement solution and the ...

Embodiment 2

[0044] The method for preparing a high-strength cellulose nano-membrane using commercial bleached wheat straw pulp as a raw material comprises the following steps:

[0045] 1) Disperse the bleached wheat straw pulp board mechanically with a pulverizer, then take 50 g of the above-mentioned raw materials and place them in a reaction kettle, and add 1200 mL of 95 wt % formic acid solution. Then hydrolyze at 85° C. for 5 h, adjust the stirring speed to 200 rpm, cool to room temperature after the reaction, and separate solid and liquid by suction filtration. The separated solid is washed with water until neutral to obtain a cellulose solid; the separated liquid is distilled under reduced pressure to recover formic acid, and simultaneously recover the sugar dissolved in the reaction process.

[0046] 2) Replace the washed cellulose solid solvent into DMF, and adjust its mass concentration to 0.4wt%. Subsequently, the above-mentioned suspension is subjected to high-pressure homogen...

Embodiment 3

[0049] A method for preparing a transparent high-strength cellulose nanofilm from bleached hardwood paddle boards, comprising the following steps:

[0050] 1) Break up the paddles with a pulverizer, then take 50 g of the above-mentioned raw materials and place them in a reaction kettle, and add 1500 mL of 80 wt % formic acid solution. Then hydrolyze at 100°C for 8 hours, adjust the stirring speed to 400 rpm, cool to room temperature after the reaction, and separate the solid and liquid by suction filtration. The separated solid is filtered and washed with deionized water until neutral cellulose solid is obtained; the separated liquid is distilled under reduced pressure to recover formic acid and simultaneously recover sugar products.

[0051] 2) Replace the washed cellulose solid solvent into DMSO, and adjust its mass concentration to 0.3wt%. The above-mentioned suspension is then subjected to ultrasonic crushing treatment, and the processing condition is: 1000W ultrasonic cr...

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Abstract

The invention discloses a high-strength transparent hydrophobic cellulose nano film and a preparation method thereof, belonging to the field of green cellulose materials and environment-friendly nano materials. The method of the invention uses natural cellulose as a raw material, firstly hydrolyzes the cellulose raw material with formic acid, and the separated cellulose solid is sequentially subjected to solvent replacement, mechanical treatment and drying to obtain the high-strength transparent hydrophobic cellulose nano film. The nanocellulose film prepared by the method of the present invention has excellent properties, compact structure, high strength and high transparency, the tensile strength of the film can be greater than 200MPa, and the transparency can reach 95%; the hydrophobic modification process of the present invention does not require complex chemical reactions and expensive Chemical reagents, molecular rearrangement and recrystallization can occur on the surface of cellulose during mechanical treatment and film formation; the water contact angle of the obtained nanocellulose film can reach 99°, and the original shape can still be maintained after long-term immersion in water. It has good water resistance and can be used in high humidity environment.

Description

technical field [0001] The invention relates to the field of green cellulose materials and environment-friendly nano materials, in particular to a high-strength transparent hydrophobic cellulose nano film and a preparation method thereof. Background technique [0002] In recent years, people have paid more and more attention to resource and environmental issues, and it has become an inevitable trend to develop and utilize renewable resources to replace traditional fossil resources. Cellulose is the most abundant biopolymer on earth, and it is mainly found in the cell walls of higher plants. Nanoscale cellulose not only has the advantages of cellulose itself such as wide source, non-toxicity, good biocompatibility, high tensile strength and biodegradability, but also has high specific surface area, high reactivity, Features such as small size effect and low thermal ductility. Nanocellulose can replace expensive, non-biodegradable synthetic materials (such as: carbon nanotub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/04C08B15/02
CPCC08B15/02C08J5/18C08J2301/04
Inventor 刘超李滨张跃冬于光冯晓燕
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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