Preparation method for nano-sliver/cellulose nanocrystalline composite particle

Abstract

The invention relates to a preparation method for a nano-sliver / cellulose nanocrystalline composite particle. The preparation method comprises the following steps of: (1) adding a cellulose raw material into an acid-mixed solution and reacting at the temperature of 50-90DEG C for 1-20 hours; after the reaction is ended, washing a reaction product with deionized water to neutral and obtaining aldehyde cellulose nanocrystalline; and (2) adding the aldehyde cellulose nanocrystalline into a silver nitrate solution; reacting at the temperature of 60-105DEG C for 10-60 minutes; and after naturally cooling, diluting a reaction product with the deionized water, centrifuging and then carrying out free drying or vacuum drying to obtain a nano-silver / CNC (Cellulose Nanocrystalline) composite material. The preparation method disclosed by the invention is simple and convenient in process, easy in operation and environment friendly and can be used for shortening the preparation period; the prepared CNC / nano-silver has the advantages of small size, easy adjustment, large specific area, firmness in combination of the CNC and the nano-silver, durable antibacterial effect, antibacterial and enhancing functions and broad application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of functional nanoparticles, in particular to a method for preparing nano silver / cellulose nano crystal composite particles. Background technique [0002] Cellulose is an inexhaustible and inexhaustible renewable natural polymer synthesized mainly by plants through photosynthesis in nature. Cellulose microcrystals / nanocrystals extracted from natural cellulose have many excellent properties, such as high strength and high modulus (Young's modulus and tensile strength can reach 150GPa and 250MPa, respectively), good biocompatibility, Biodegradable, rich in highly reactive hydroxyl groups on the surface, high crystallinity and good shape retention, it has been widely used in food, medicine, cosmetics and paint stabilizers (such as CN101481424A; CN1448427A; CN1340651A), plastics and Rubber filler (such as CN1369508A; CN1340651A) and synthetic leather production (such as CN101070352A; CN1220271A). In parti...

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Problems solved by technology

However, the preparation process is not only multi-step, but periodate needs to open the glucoside ring of CNC, thereby destroying its rigid structure. The enhancement effect of biodegradable polymer matrix materials

Liu et al. put the CNC obtained from the acid hydrolysis of microcrystalline cellulose in the NaClO / NaBr / 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) co-oxidation system to selectively oxidize it. The C6 primary hydroxyl group can reduce the silver salt to nano-silver without destroying the glycoside ring. This kind of composite particle can strengthen the water-soluble polyurethane material and endow the nano-material with good antibacterial properties, but this method is time-consuming and requires many steps. The raw materials of TEMPO are expensive and TEMPO can only oxidize the primary hydroxyl group of C6, the hydroxyl groups of C2 and C3 will not be oxidized and cannot become the reduction point, and the loading of nano-silver is low (Liu H, Song J, Shang S, Song Z, Wang D .Cellulose nanocrystal / silver nanoparticle composites as bifunctional nanofillers within waterborne polyurethane.ACS Appl.Mater.Interfaces 2012;5:2413–2419)

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