Preparation method of SiO2 aerogel-filled carbon aerogel

Abstract

The invention discloses a preparation method of SiO2 aerogel-filled carbon aerogel. The preparation method is characterized by comprising the following steps: (1) preparing carbon aerogel, namely taking resorcinol (R) and formaldehyde (F) as precursors (the molar ratio of R to F is 1 : 2), anhydrous sodium carbonate as a catalyst and carbon foam as a framework, and preparing the carbon aerogel based on the carbon foam; (2) performing acid treatment on the surface of the carbon aerogel, namely mixing H2O2, NH3H2O and H2O according to a volume ratio of 1 : 1 : 5 to form a mixed solution, and soaking the carbon aerogel in the mixed solution under the water-bath condition at 90 DEG C for 1 hour; (3) preparing a SiO2 precursor solution, soaking the carbon aerogel in the precursor solution, ageing and drying to obtain the SiO2 aerogel-filled carbon aerogel. The preparation method is reliable and good in safety; the prepared composite aerogel keeps good performances of the aerogel and improves the mechanical performance of the aerogel; the surface of the composite aerogel is hydrophobic, so that moisture in the air is not easily absorbed and the shrinkage rate is low.

Description

technical field [0001] The present invention relates to the preparation method of gel, relate in particular to a kind of filling SiO2 2 Airgel carbon aerogel preparation method. Background technique [0002] In 1931, Kistler replaced the position of the liquid component in the gel with gas, notifying the wall to keep the gel from collapsing, and prepared the world's first aerogel. This solid material is the man-made substance with the lowest density known in the world, known as "solid smoke". In addition to the extremely low apparent density (0.003~0.3g / cm 3 ), airgel also has high porosity (80% ~ 99.8%), extremely low thermal conductivity (10 ~ 40mW / m k) and large specific surface area (100 ~ 1600m 2 / g) and other characteristics. [0003] Due to these outstanding properties, aerogels are expected to be "magical materials that change the world" and have broad application prospects in many fields. Such as heat insulation materials, sound insulation materials, optical de...

AI Technical Summary

Problems solved by technology

However, in practice, the application of airgel is restricted by two factors: (1) the high porosity of aerogel makes this material very fragile and poor durability in the actual application environment; (2) Supercritical drying technology is commonly used in the gel preparation process, which involves high temperature and high pressure, and the cost is high