Method for rapid preparation of SiO2 aerogel micro-balloons

Abstract

The utility model relates to a rapid preparation method of SiO2 aerogel sphere, belonging to a field of inorganic metallic materials, in particular to a method of rapidly preparing SiO2 aerogel sphere. Water glass is used as raw material that performs ion exchange to obtain the silicic acid PH=2-3, after added with alkaline catalyst, the silicic acid is added into the hydrophobic oil, and then is mixed to cut into micro liquid drops that are spherically suspended in the oil under the action of surface tension, the silicic acid is mixed until aerogel sphere is generated, afterwards, the oil and the sphere perform solid-liquid separation, and then are cleaned with water to obtain aerogel sphere, the aerogel sphere is soaked by the ethanol and absolute alcohol in sequence to perform solvent exchange to obtain alcohol gel sphere, after dried, aerogel sphere with micrometer or millimeter grade particles can be otained. The invention has low cost, easy and controllable process, mass production, good product quality and wide application prospect in the heat isolation and catalysis fields.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, relates to a nanoporous material, in particular to a method for rapidly preparing SiO 2 Airgel microspheres approach. Background technique [0002] SiO 2 Airgel is a new type of solid material with nanoporous structure formed by the mutual aggregation of nanoparticles. It has the characteristics of low density, high porosity, large specific surface area, uniform distribution and good light transmission performance. It is very useful in many fields. The wide application prospect has been highly valued by material researchers and other researchers. [0003] Currently, on the preparation of SiO 2 There are many reports on aerogels, but the final products prepared are mostly blocks or powders of different sizes. SiO 2 Airgel bulk materials have the defects of being brittle and brittle and difficult for practical application, while powdered SiO 2 In practical applications, aerogel...

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Problems solved by technology

However, based on the necessary drop time as a reason for the reaction time of the gel, the overall height of the hydrogel to be injected would be very large

In order to reduce the height of the equipment, the patent No. 98805632.1 "Preparation method of near-spherical lyogel and aerogel" has further improved it. Adding lyosol to the steam not only accelerates the gel reaction, but also The glue time is shortened, and the falling direction of the liquid droplets is opposite to the direction of the steam flow, so the falling speed of the liquid droplets is reduced, and finally the height of the equipment is reduced, but the equipment and method used in this invention are still relatively complicated

Another SiO 2 Airgel pellets and TiO 2 / SiO 2 The preparation method of airgel microspheres also has some disadvantages. On the one hand, silica sol is used as the silicon source, which is more expensive. On the other hand, the first three patents use n-heptane or n-hexane, Span 80, Tuwen 85, n-butanol or n-hexanol are used as raw materials to prepare the oil phase, and the last patent uses ammonia water, cetyl ammonium bromide saturated solution and kerosene to prepare the oil phase, which not only makes the oil phase components complicated and the preparation process More cumbersome, and some chemical reagents may also cause environmental pollution problems