A kind of preparation method of nanoparticle aqueous dispersion

Abstract

A method for preparing a nanoparticle aqueous dispersion, comprising: mixing raw nanoparticle and water according to a preset mass ratio, mechanically stirring at a preset rotation speed and a first preset time to obtain a nanoparticle slurry; The nanoparticle slurry is added to a high-pressure homogenizer for shearing to reduce the particle size of the nanoparticles in the nanoparticle slurry; finally, the sheared nanoparticle slurry is added to a micro-jet homogenizer for secondary shearing to obtain An aqueous nanoparticle dispersion, wherein the particle size of the nanoparticles in the aqueous nanoparticle dispersion is 50-300nm. The nanoparticle aqueous dispersion is prepared by high-pressure homogenizer shearing and micro-jet homogenizer secondary shearing. During the preparation process, the nano-particles can be controlled by adjusting the pressure and processing time of high-pressure homogenizer shearing and micro-jet homogenizer. The particle size makes the prepared nanoparticle aqueous dispersion have better stability. The method is simple, does not need to use organic solvents and stabilizers, and does not have the problems of environmental pollution and subsequent waste liquid treatment.

Description

technical field [0001] The invention relates to the technical field of nanoparticles, in particular to a method for preparing an aqueous dispersion of nanoparticles. Background technique [0002] The size of nanoparticles has an important impact on their physical and chemical properties. Nanoparticles have many excellent electrical, optical, magnetic, force, thermal and other physical and chemical properties due to their small size effect, surface effect and quantum size effect. In many production processes, nanoparticles are required to be uniformly and stably dispersed in liquid media, such as: paints, medicines, dyes and cosmetic preparations, etc.; Whether it can be uniformly dispersed in the medium and the size of the nanoparticles will directly affect the effect of its application in the field. [0003] However, due to the large specific surface area and high surface energy of nanoparticles, the nanoparticles suspended in the liquid have a tendency to agglomerate each...

AI Technical Summary

Problems solved by technology

The graphene method prepared in the present invention is simple, and size is uniform, and the method used in the present invention belongs to the mechanical dispersion in the physical dispersion method, and process is relatively simple, but in the invention in order to improve expanded graphite and graphene dispersion degree, used multiple dispersants to Maintain its dispersed state, affecting the purity of the product itself

[0008] Although many methods for preparing nanoparticle dispersions have been disclosed, some of them can achieve particle size control. Among them, the chemical method involves the use of many organic solvents and chemical reagents, and there are environmental pollution and certain safety hazards. Some chemical modifications are only for specific Nanoparticles and functional groups have great limitations; in comparison, the physical method is more environmentally friendly and safe, but the physical method has problems such as low dispersion efficiency, long processing time, and high energy consumption of equipment. Therefore, on the existing basis, looking for An efficient, environmentally friendly, and widely applicable dispersion method is of great significance for the application of nanoparticle dispersions

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