Esterquat-containing modified nano-cellulose as well as preparation method and application thereof

Abstract

The invention belongs to the field of cellulose organic modification, and in particular relates to an esterquat-containing modified nano-cellulose as well as a preparation method and an application thereof. The esterquat-containing modified nano-cellulose is prepared through the method comprising the following steps: adding an esterquat-containing surfactant in a nano-cellulose aqueous dispersion, and obtaining a white suspension liquid after an adequate reaction; carrying out an ultrasonic treatment on the white suspension liquid, then centrifuging to remove a supernatant liquid, taking a white solid precipitate, and obtaining the esterquat-containing modified nano-cellulose after vacuum freeze-drying and grinding. According to the method disclosed by the invention, the nano-cellulose is modified by the esterquat-containing surfactant, the cationic surfactant is efficient and non-toxic, simple in synthesis method, high in positive charge density, and easy to degrade, and the ester group thereof is capable of effectively acting with a cellulose surface hydroxyl group, and effectively improving the compatibility between the nano-cellulose and many types of polar hydrophobic polymers (such as polylactic acid).

Description

technical field [0001] The invention belongs to the field of organic modification of cellulose, and in particular relates to an ester group-containing quaternary ammonium salt-modified nano-cellulose and a preparation method and application thereof. Background technique [0002] Cellulose is one of the most abundant natural organic substances in the world. Nanocellulose and its derivatives are widely used in the fields of textile, light industry, chemical industry, national defense, petroleum, medicine, energy, biotechnology and environmental protection. However, due to the aggregated structural characteristics of natural cellulose and the presence of many hydroxyl groups and high crystallinity between molecules and molecules, it cannot be dissolved in water and general organic and inorganic solvents, and it also lacks thermoplasticity and chemical corrosion resistance. The performance and strength are relatively poor, which is extremely unfavorable to its molding, processin...

AI Technical Summary

Problems solved by technology

However, due to the aggregated structural characteristics of natural cellulose and the presence of many hydroxyl groups and high crystallinity between molecules and molecules, it cannot be dissolved in water and general organic and inorganic solvents, and it also lacks thermoplasticity and chemical corrosion resistance. Poor performance and strength, which are extremely unfavorable to its molding, processing and application, resulting in many restrictions on its application

For example, in the application of cellulose to polylactic acid modification, there are problems such as poor compatibility between cellulose and polylactic acid and poor mechanical properties.

[0003] At present, it has been reported to use small molecule and polymer quaternary ammonium salt cations to synergistically modify nanocellulose, but the method is relatively complicated, the modifier is not easy to degrade, and it is only used in the field of textile dyeing.

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