Method for preparing reinforced carbon aerogel with silica sol

Abstract

The invention relates to the technical field of inorganic material preparation, in particular to a method for preparing reinforced carbon aerogel with silica sol. The method includes adopting poplar wood as a raw material to obtain coarse wood fiber powder, processing the coarse wood fiber powder to obtain wood nanocellulose, mixing the silica sol, nitric acid solution and absolute ethanol to obtain a mixed solution, then dropping the mixed solution and ammonia water into a mixture of n-heptane, n-butyl alcohol and sucrose ester for reaction, filtering and separating to obtain a filter cake, finally washing the filter cake to obtain gel microspheres and processing the gel microspheres to obtain the reinforced carbon aerogel with silica sol. The affinity between the silica sol and the fiberis utilized to reinforce the pore structure of the fiber to further improve the strength of the carbon aerogel. When the wood nanocellulose is dispersed in water, a three-dimensional network structure can be formed by means of hydrogen bonds between fibers and the entanglement of the long fibers to obtain stable hydrogel. The fiber provides a stable network frame of aerogel, the strength and membrane amount of the aerogel are improved, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of inorganic material preparation, in particular to a method for preparing carbon airgel reinforced with silica sol. Background technique [0002] Airgel is a porous amorphous solid material composed of nano-scale colloidal particles or polymer molecules, and it is also the lightest condensed material among synthetic materials. Its unique open nanoporous structure and continuous three-dimensional network make it have extremely low density, high specific surface area and high porosity, showing strong adsorption and catalytic ability, low thermal conductivity, low acoustic impedance and low refractive index, etc. Therefore, airgel has become a good catalyst and its carrier, adsorbent and gas filter material. [0003] Traditional airgel materials include silica, alumina, silica-alumina, resorcinol-formaldehyde (RF) and carbon aerogel, among which carbon aerogel is a light Nanoporous materials with high porosi...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is that the carbon aerogel prepared by the current existing method has problems such as low stren