Composite aerogel material with sterilization function as well as preparation method and application thereof

Abstract

The invention relates to a composite aerogel material with a sterilization function as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing silica sol by taking organosilicon ester as a raw material, an acidic reagent as a catalyst and an organic solvent as a dispersing agent; sequentially adding a first alkaline reagent and nano-silver in the obtained silica sol, uniformly stirring, and then carrying out first dispersion treatment, thus obtaining semigel; adding a second alkaline reagent in the obtained semigel, and carrying outsecond dispersion treatment, thus obtaining wet gel; sequentially carrying out aging, solvent replacement and drying on the obtained wet gel, thus preparing the composite aerogel material with the sterilization function. According to the composite aerogel material and the preparation method thereof, disclosed by the invention, a preparation process is simple, the cost is low, and the nano-silveris stably and uniformly dispersed in a three-dimensional nano network structure of aerogel. The composite aerogel material prepared by the method has the advantages of low density, low heat conductivity, high sterilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of airgel preparation, and in particular relates to a composite airgel material with bactericidal function, a preparation method and application thereof. Background technique [0002] Airgel is a three-dimensional porous nanomaterial with ultra-low density formed by the mutual accumulation of nanoparticles. It has the typical characteristics of low thermal conductivity, high specific surface area, and low density. Due to its nano-skeleton and nano-porous structure, the pore size is between 2 and 50nm range, so it effectively suppresses solid-phase heat transfer, gas convective heat transfer and gas-phase heat transfer. The unique structure of airgel determines its excellent thermal insulation performance (very low thermal conductivity, which can be as low as 0.013W / (m·K)), so it has received extensive attention in the field of aerospace. With the development of aerospace technology, the flight speed of air...

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Problems solved by technology

However, the water in the silver nitrate aqueous solution will adversely affect the aging and drying process of the subsequent gel

For example, if the amount of water is too large, it will inevitably make it more difficult to dry the gel, and the shrinkage of the gel will increase during the drying process, which will easily lead to cracking of the gel and prolong the drying time.

In addition, although due to the confinement effect of pore size, the silver nanoparticles in the composite airgel material are small, uniform in size and difficult to agglomerate, but limited by the concentration of the precursor solution or silica particle solution, the composite components ( Nano-silver) content is relatively small, and the adsorption amount of silver ions is also difficult to accurately control, so that some characteristics of silver nanoparticles cannot be well displayed in composite materials.

[0004] Chinese patent CN105236929B discloses a SiO with bactericidal function 2 The preparation method of airgel, this method is by silver nanowire and SiO 2 Airgel composite, prepared SiO with bactericidal function 2 airgel, but the method is complicated to operate, and the prepared SiO with bactericidal function 2 Airgel has high density and high thermal conductivity, and due to the large size of silver nanowires, the SiO 2 The dispersion in the airgel is poor, which affects the bactericidal effect of the material prepared by this method

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