Preparation method of foam reinforced SiO2-TiO2 composite aerogel

The invention discloses a preparation method of foam reinforced SiO2-TiO2 composite aerogel. The preparation method comprises the steps: mixing tetraethyl orthosilicate and tetrabutyl titanate according to a certain proportion; sequentially adding absolute ethyl alcohol and deionized water, stirring, adding a catalyst after a period of time, dipping foam into the prepared SiO2-TiO2 colloidal solution, gelling and aging, and finally performing supercritical drying. The catalyst is only used once when the SiO2-TiO2 composite sol is prepared, so that the foam reinforced SiO2-TiO2 composite aerogel is prepared by a 'one-step catalytic method'. Moreover, TiO2 in the composite aerogel prepared by the method disclosed by the invention has excellent shading performance, and has a heat radiation prevention effect while insulating heat, so that the high-temperature heat conductivity of the aerogel can be effectively reduced. Meanwhile, the foam is used as a reinforcing body, so that the defect that the SiO2-TiO2 aeroge