Carboxymethyl cellulose/aramid nano fiber composite membrane as well as preparation method and application thereof

Abstract

The invention belongs to the field of nano composite materials and preparation methods and application thereof, and particularly relates to a carboxymethyl cellulose / aramid nano fiber composite membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing aramid nano fibers; (2) dissolving and dispersing carboxymethyl cellulose and the aramid nano fibers in an aqueous solution; and (3) preparing the carboxymethyl cellulose / aramid nano fiber composite membrane. The preparation method provided by the invention can improve the hydrophobicity, thermal stability, mechanical strength, ultraviolet shielding property and the like of the membrane. The thermal stability, hydrophobicity and mechanical property of the prepared transparent carboxymethyl cellulose / aramid nano fiber composite membrane are greatly improved, and the ultraviolet light transmittance is lower than 3%. The transparent carboxymethyl cellulose / aramid nano fiber composite film with good thermal stability, high strength and excellent ultraviolet shielding performance can be used in the packaging fields of traditional Chinese medicines, fruits and vegetables, meat and the like in subtropical and tropical areas with high temperature, strong ultraviolet rays and high humidity.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials and their preparation and application, in particular to a carboxymethyl cellulose / aramid fiber nanofiber composite film and its preparation method and application. Background technique [0002] Along with economic development and social progress, environmental problems are deteriorating and petrochemical resources are seriously scarce. It is imperative to develop environmentally friendly, renewable and degradable green packaging materials. [0003] Carboxymethyl cellulose is an ionic cellulose ether obtained by alkalization and etherification of cellulose. It is one of the most widely used and most used cellulose derivatives in the world today. Carboxymethyl cellulose is a white granular powder, odorless, tasteless, easy to disperse in water to form a transparent colloidal solution, has multiple functions such as thickening, bonding, emulsifying, water retention, etc., and has good biodegra...

AI Technical Summary

Problems solved by technology

At the same time, carboxymethyl cellulose, as a hydrophilic polysaccharide polymer, has good barrier properties to oxygen and carbon dioxide, and can be used as an edible coating material for food preservation, and has broad development prospects in the food packaging industry , but the film quality of carboxymethyl cellulose alone is average and its anti-ultraviolet performance is poor. It is necessary to improve its mechanical properties by chemical or physical methods

[0004] Aramid fiber is a kind of high-performance synthetic fiber, which is widely used for its low density, high modulus, high strength and other excellent properties, but its strong hydrophobicity and poor surface wettability lead to weak interfacial bonding, which affects its compatibility Adhesive properties between substrates

Aramid nanofibers, which have the advantages of both aramid fibers and polymer nanofibers, can effectively solve the problems of smooth surface, low activity, and poor composite effect of aramid fibers. They are often used as an additive phase to prepare composite materials. However, there have been no reports on the modification of carboxymethyl cellulose membrane by aramid nanofibers to improve its mechanical, high temperature resistance, hydrophobicity, and ultraviolet shielding properties.

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