Regenerated cellulose nano-particles and preparation method thereof

Abstract

The invention discloses regenerated cellulose nano-particles and a preparation method thereof. The method comprises the following steps: thermally gelating a cellulose solution, soaking to prepare cellulose hydrogel, soaking the cellulose hydrogel a PEO water solution to obtain a cellulose gel/PEO/water mixture, dewatering the cellulose gel/PEO/water mixture obtain a PEO/cellulose primary mixture, and finally further mixing the PEO/cellulose primary mixture by a fusion mixing method to obtain the cellulose nano-particles which are uniformly dispersed in PEO. The method provided by the invention is green and environment-friendly, consumes low energy and employs simple equipment; the end products are in stable solid state, that is, the cellulose nano-particles are uniformly dispersed in PEO, are convenient and stable to store and transport, and are free of a drying process during further application. PEO in the mixture can take the functions of a dispersing agent, a surface modification agent and the like at the same time. Different from the conventional fibrous nano fiber material, the regenerated cellulose nano-particles prepared according to the method are spherical particles and aggregates thereof.

Description

technical field [0001] The invention relates to the technical field of preparation of renewable and biodegradable natural polymer materials, in particular to a preparation method of regenerated cellulose nanoparticles and cellulose nanoparticles prepared by the method. Background technique [0002] In addition to inheriting the advantages of a wide range of sources of cellulose materials, low cost, light weight, renewable and biodegradable, cellulose nanoparticles also have excellent mechanical properties. Cellulose nanoparticles (density 1.5 ~ 1.6g cm -3 ) Young's modulus is much higher than glass fiber Young's modulus (70GPa, density 2.6g cm -3 ), Kevlar fibers with excellent mechanical properties (60~125GPa, density 1.45g cm -3 ), in addition, the strength of cellulose nanocrystals even exceeds that of steel (200-220GPa, density about 8g cm -3 ). Therefore, cellulose nanoparticles are ideal candidates for reinforcing fillers, and are widely used to strengthen various ...

AI Technical Summary

Problems solved by technology

There are two problems in this process: one, due to the large surface energy of cellulose nanoparticles, irreversible aggregation will occur between the cellulose particles when the cellulose nanoparticle suspension is dried, and redispersion will be very difficult; two, Most polymer materials are hydrophobic, while cellulose is hydrophilic, so the compatibility between cellulose and most polymer materials is poor, the two are not easy to mix uniformly and the interfacial interaction force is weak

This invention proposes for the first time the use of sodium hydroxide (or lithium hydroxide) / urea aqueous solution system to prepare regenerated cellulose nanofibers, but after the cellulose is regenerated, it is necessary to further remove the water-soluble substances in the suspension, and to redisperse and operate Difficult, tedious steps

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