Preparation method of fiber cross-linked aerogel composite material

Abstract

The invention discloses a fiber cross-linking aerogel composite material and a preparation method thereof and belongs to the technical field of aerogel composite materials. The fiber cross-linking aerogel composite material consists of fiber, polyurea and silicon dioxide. The preparation method comprises the following steps: (1) dissolving TEOS (Tetra Ethyl Ortho-Silicate), water and HCl in ethyl alcohol to prepare a solution A, and dissolving APTES (Amino Propyl Tri-Ethoxy-Silan) in the ethyl alcohol to prepare a solution B; (2) mixing the solution A with the solution B and subsequently mixing the solution A and the solution B with fiber, ageing after gelling, soaking and washing with ethyl alcohol after the ageing is completed, and then soaking and washing with acetone to obtain wet gel; (3) preparing a cross-linking solution, and soaking the wet gel in the cross-linking solution; (4) soaking and washing the wet gel obtained in the step (3) by using acetone; and (5) soaking and washing the wet gel by using normal hexane, and drying to obtain the fiber cross-linking aerogel composite material. According to the fiber cross-linking aerogel composite material, the property of the aerogel is improved by using two manners of cross-linking organic matters and reinforcing fiber; and the prepared fiber cross-linking aerogel composite material is good in mechanical property and good in heat preservation and heat insulation properties.

Description

technical field [0001] The invention relates to the technical field of airgel composite materials. Background technique [0002] Airgel is a three-dimensional network structure whose skeleton is connected by small nanoscale particles, and the pores between the skeletons are also at nanoscale and filled with gas. It is precisely because of this microstructure of airgel that it has many excellent properties. Its density is the lightest known solid material up to 0.16g / L, and its specific surface area can reach up to 500m 2 / g, the porosity can reach up to 99.9%, and its thermal conductivity can be as low as . Aerogel has a unique microstructure, which makes it exhibit unique properties in thermal, acoustic, optical, mechanical and other aspects. These unique properties make it have good application prospects in heat insulation, sound insulation, hydrogen storage, catalysis and other fields. Pure SiO 2 The three-dimensional network structure of airgel has poor mechanical...

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Problems solved by technology

The polymer cross-linked silica airgel prepared by this method has a density of 0.43g / cm 3 , the thermal conductivity is 0.052W / mK, and it also shows good mechanical properties, but it takes a long time to change the liquid or cross-link in the preparation process, and low temperature conditions are required in the preparation of the wet gel process, which is resistant to airgel blocks. Limited increase in folding and tensile strength