Cellulose-based transparent waterproof film with high dimensional stability and preparation method thereof

Abstract

The invention relates to a cellulose-based transparent waterproof film with high dimensional stability and a preparation method thereof, and the preparation method comprises the following steps: modifying pretreated nano plant fibers by adopting an ion exchange mode, and mixing with micron-sized plant fibers, so that a three-dimensional network structure is strengthened, and a repulsive effect isgenerated on water molecules, and the moisture resistance of the film is remarkably improved. According to the invention, the problem of contradiction between the super-hydrophobicity and the light transmittance of the surface of the film is solved by selectingan adhesive, so that the super-hydrophobicity is ensured, and the film has excellent visible light transmittance. According to the invention, the dimensional stability of the film under a high-humidity condition is realized through the synergistic effect of water-resistant anti-plasticizing treatment and surface hydroxyl covering treatment in the film for the first time, and the film can resist the plasticizing of small-volume liquid and gaseous water molecules and can also prevent the permeation of large liquid drops; secondly, theadhesive is introduced, so that effective adhesion of low-surface-energy substances on a cellulose film substrate is realized, and the dimensional stability of the film is greatly improved while the super-hydrophobicity and high visible light transmittance of the film are ensured.

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 ...

AI Technical Summary

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

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