Holocellulose nano composite fiber and preparation method thereof

Abstract

The invention discloses a preparation method of a holocellulose nano composite fiber. The preparation method comprises the following steps: a microcrystalline cellulose suspension is ground and centrifugally separated to obtain a cellulose nanocrystalline supernatant, the cellulose nanocrystalline supernatant is added into a cellulose fiber spinning solution to be uniformly mixed, bubbles are removed from the uniformly mixed cellulose nanocrystalline / cellulose fiber spinning solution, and then spinning is conducted, wherein the length of the cellulose nanocrystalline in the supernatant is 223+ / -100 nm to 366+ / -171 nm, and the diameter of the cellulose nanocrystalline is 29+ / -8 nm to 35+ / -9 nm. According to the preparation method, the cellulose nanocrystalline can be uniformly dispersed inthe cellulose fiber spinning solution, meanwhile, the dispersion stability of the cellulose nanocrystalline in the spinning solution is improved, reaggregation of the cellulose nanocrystalline is avoided, the cellulose nanocrystalline can be uniformly dispersed in the spinning solution, and finally the mechanical property of the composite fiber is improved.

Description

technical field [0001] The invention relates to the field of full cellulose nano composite fibers, in particular to a full cellulose nano composite fiber and a preparation method thereof. Background technique [0002] Composite materials are a class of materials that consist of two or more different components with significantly different physical and / or chemical properties. The resulting composites can have enhanced mechanical properties (relative to those of the matrix) and / or new functionalities (eg barrier properties). Typically, composite materials consist of a strong and stiff component, the reinforcement, embedded in a softer (relative to the reinforcement) component matrix. In this way, the strength properties of the composite lie between the reinforcement and the matrix. Reinforcements in composites can be structurally classified as: woven fabrics, continuous fibers, short fibers, and particulate matter, or morphologically classified as macroscopic, microscopic, o...

AI Technical Summary

Problems solved by technology

[0004] At present, in the process of preparing nanocomposite fibers, there are problems that nanomaterials are not easy to disperse uniformly in the polymer matrix, and are prone to unstable dispersion, which eventually leads to a decline in the physical properties of the composite product and cannot achieve the desired mechanical strength.

For example, the patent "a preparation method of high-strength viscose fiber (CN103255488B)" adopts the method of dispersing nano-whiskers by secondary mechanical stirring to improve the dispersion of nano-whiskers in viscose solution, but in fact due to mechanical stirring Dispersion is actually only an auxiliary means of dispersion. It is difficult to overcome the self-aggregation of nano whiskers. In practice, it is still difficult to obtain a well-dispersed dispersion, and it is likely that products with effectively enhanced physical properties cannot be obtained.

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