Lightweight, efficient and heat-insulating elastic aerogel material and preparation method thereof

The invention relates to a lightweight, efficient and heat-insulating elastic aerogel material and a preparation method thereof.The method comprises the steps that titanium oxide nanometer powder and an alkaline solution are evenly mixed with water, a mixed solution is obtained, then the mixed solution is placed in a reaction kettle with a polytetrafluoroethylene material as a lining, a hydrothermal reaction is conducted at the temperature of 200-300 DEG C, and titanate wet gel is obtained; soaking the titanate wet gel in an acid solution with the pH value of 1-5 for 6-72 hours to obtain acid soaking treatment gel; soaking the acid soaking treatment gel in water for 5-110 hours to obtain washed gel; placing the washed gel in an ethanol solution of tetraethoxysilane, carrying out solvent replacement for 6-72 hours, and repeating the step for at least one time to obtain a gel block; the gel blocks are sequentially subjected to supercritical drying and heat treatment, and the light efficient heat-insulation elas