A kind of cellulose-based transparent waterproof film with high shape stability and preparation method thereof

A cellulose-based, waterproof film technology, applied in coatings and other directions, can solve the problems of inability to prevent small-volume water molecules from attacking layer by layer, dimensional stability effects, etc., to reduce electrostatic repulsion, reduce energy consumption, and improve water filtration. The effect of efficiency

Active Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing technology only considers the superhydrophobicity of the film surface or the water resistance of the interior unilaterally. For a film with superhydrophobicity on the surface, although the hydroxyl groups on the surface of the film are covered, it can prevent larger micro-droplets from permeation, but it cannot prevent the layer-by-layer attack of small-volume water molecules; and for the internal water-resistant film, although it can resist the plasticization of gaseous and liquid water molecules, a large number of hydroxyl groups exposed by the film are hydrophilic, which in the long run leads to Dimensional stability is affected

Method used

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  • A kind of cellulose-based transparent waterproof film with high shape stability and preparation method thereof

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Effect test

Embodiment 1

[0044] A kind of cellulose base transparent waterproof film of high shape stability, its preparation method comprises the steps:

[0045] (1) Using bleached hardwood pulp fiber as raw material, TEMPO oxidation pretreatment method was used to weigh 2,2,6,6-tetramethylpiperidine-nitrogen-oxide (TEMPO ) and 10wt% of dry pulp were weighed NaBr in a beaker, added distilled water to 100mL, and dissolved under magnetic stirring, stand-by. Transfer 200 g of bleached hardwood pulp fibers with a mass concentration of 10% to a round bottom flask, add 1000 g of water, and stir the slurry at a speed of 500 r / min. After stirring for 30 minutes, add sodium bromide solution and TEMPO solution in turn. Then weigh the NaClO solution according to 1 g of absolute dry pulp corresponding to 8 mmol NaClO, slowly add it into the flask, add distilled water to adjust the slurry concentration to 1.0%, and control the pH of the whole reaction process to maintain at 10.5. When the pH no longer drops, th...

Embodiment 2

[0050] A kind of cellulose base transparent waterproof film of high shape stability, its preparation method comprises the steps:

[0051] (1) Using bleached softwood pulp fiber as raw material, TEMPO oxidation pretreatment method was used to weigh 2,2,6,6-tetramethylpiperidine-nitrogen-oxide (TEMPO ) and 10wt% of dry pulp were weighed NaBr in a beaker, added distilled water to 100mL, and dissolved under magnetic stirring, stand-by. Transfer 200 g of bleached softwood pulp fibers with a mass concentration of 10% to a round bottom flask, add 1000 g of water, and stir the slurry at a speed of 500 r / min. After stirring for 30 minutes, add sodium bromide solution and TEMPO solution in turn. Then weigh the NaClO solution according to 1 g of absolute dry pulp corresponding to 8 mmol NaClO, slowly add it into the flask, add distilled water to adjust the slurry concentration to 1.0%, and control the pH of the whole reaction process to maintain at 10.5. When the pH no longer drops, th...

Embodiment 3

[0056] A kind of cellulose base transparent waterproof film of high shape stability, its preparation method comprises the steps:

[0057] (1) Using bamboo pulp fiber as raw material, TEMPO oxidation pretreatment method was used to weigh 2,2,6,6-tetramethylpiperidine-nitrogen-oxide (TEMPO) and Weigh 10wt% of dry pulp NaBr into a beaker, add distilled water to 100mL, dissolve under magnetic stirring, and set aside. Transfer 200 g of bamboo pulp fibers with a mass concentration of 10% to a round bottom flask, add 1000 g of water, and stir the slurry at a speed of 500 r / min. After stirring for 30 minutes, add sodium bromide solution and TEMPO solution in turn. Then weigh the NaClO solution according to 1 g of absolute dry pulp corresponding to 8 mmol NaClO, slowly add it into the flask, add distilled water to adjust the slurry concentration to 1.0%, and control the pH of the whole reaction process to maintain at 10.5. When the pH no longer drops, the reaction is complete. Then ...

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Abstract

The invention relates to a cellulose-based transparent waterproof film with high shape stability and a preparation method thereof. The pretreated nano-plant fibers are modified by ion exchange, and mixed with micron-scale plant fibers to strengthen the three-dimensional network structure. And produce repulsion to water molecules, so that the moisture resistance of the film is significantly improved. The present invention solves the conflicting problem of superhydrophobicity and light transmittance on the surface of the film through the selection of adhesives, and not only ensures superhydrophobicity, but also has excellent visible light transmittance. For the first time, the invention achieves the shape stability of the film under high humidity conditions through the synergistic effect of the water-resistant and anti-plasticization treatment inside the film and the hydroxyl masking treatment on the surface. The film can not only resist the plasticization of small-volume liquid and gas water molecules, but also Prevent the penetration of large droplets; secondly, introduce an adhesive to realize the effective adhesion of low surface energy substances on the cellulose film substrate, ensure the superhydrophobicity and high visible light transmittance of the film, and greatly improve the dimensional stability of the film .

Description

technical field [0001] The invention belongs to the technical field of micro-nano plant fiber material waterproofing and papermaking, and in particular relates to a cellulose-based transparent waterproof film with high shape stability and a preparation method thereof. Background technique [0002] Nanocellulose films are widely used in packaging, electronic devices, batteries, books and currency due to their excellent mechanical properties, low thermal expansion, light weight, flexibility, transparency and biocompatibility. Because the surface of nanocellulose is rich in hydroxyl groups, it is very sensitive to environmental humidity, especially when the film is exposed to high humidity (water or RH>65%), water molecules permeate the film as a plasticizer, weakening the hydrogen bonds between fibers, It causes the film to swell or even dissolve to change the shape stability and lose strength, barrier and durability. Some researchers use cellulose nanocrystalline film as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08J5/18C08L1/04C08L1/28C08L97/02C08L1/02C09D133/12C09D7/63
CPCC08J5/18C08J2301/04C08J2301/28C08J2401/02C08J2497/02C08K2201/011C09D133/12C09D7/63C08J7/0427C08K5/544
Inventor 陈港钱杨杨张亚增魏渊张梦丽
Owner SOUTH CHINA UNIV OF TECH
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