Silica aerogel powder and preparation method thereof

The invention discloses silicon dioxide aerogel powder and a preparation method thereof, and the preparation method of the silicon dioxide aerogel powder comprises the following steps: dropwise adding an acid solution into a water glass solution until the pH value of the water glass solution is 8-10, and standing for reaction to obtain a gel block; crushing the gel block, mixing the crushed gel block with a surface modification solution, heating in a water bath, and stirring to obtain a mixture; and obtaining upper-layer powder from the mixture, and drying and grinding the upper-layer powder to obtain the silicon dioxide aerogel powder. The preparation method solves the technical problems of high cost, complex process and long preparation time in preparation of the silicon dioxide aerogel in the prior art. 本申请公开了一种二氧化硅气凝胶粉末及其制备方法，所述二氧化硅气凝胶粉末的制备方法包括以下步骤：向水玻璃溶液中滴加酸液至所述水玻璃溶液的pH为8-10，静置反应，得到凝胶块；将所述凝胶块进行破碎后，与表面改性溶液混合，水浴加热并搅拌，得到混合物；从所述混合物中获取上层粉末，将所述上层粉末进行干燥，研磨，得到二氧化硅气凝胶粉末。本申请解决了现有技术制备二氧化硅气凝胶的成本较高、工艺较复杂且制备时间较长的技术问题。