Phenyl-reinforced flexible silicon dioxide aerogel as well as preparation method and application thereof

Abstract

The invention discloses phenyl reinforced flexible silicon dioxide aerogel as well as a preparation method and application thereof, wherein the phenyl reinforced flexible silicon dioxide aerogel is prepared by taking at least one first silicon source comprising a phenyl group and at least one second silicon source comprising a methyl group as precursors through a sol-gel method. The aerogel has the advantages of super-hydrophobicity, excellent mechanical property, good oil-water separation capacity, excellent thermal stability and excellent flame retardance. The preparation method comprises the following steps: step 1, preparing materials according to the phenyl reinforced flexible silicon dioxide aerogel; step 2, acidification hydrolysis: dissolving CTAB in an acid solution to obtain a mixed solution, adding a first silicon source and a second silicon source into the mixed solution, and continuously stirring to acidify and hydrolyze the first silicon source and the second silicon source; step 3, alkalization and polycondensation: alkali is added into the solution after acidification and hydrolysis, and gel is formed through alkalization and polycondensation; step 4, aging and drying the gel to obtain the phenyl reinforced flexible silicon dioxide aerogel.

Description

technical field [0001] The invention relates to the technical field of aerogels, in particular to a phenyl-reinforced flexible silica aerogel, a preparation method and an application. Background technique [0002] Silica airgel has many excellent properties such as low density, high porosity, large specific surface area, excellent hydrophobicity and low thermal conductivity, and is widely used in aerospace, construction, catalysis, heat insulation, microelectronics and medicine, etc. In the field, its skeleton is mainly connected by Si-O-Si bonds. Due to the existence of a large number of Si-O-Si bonds, the pure silica airgel network is a rigid structure, so its mechanical properties are very poor, and it is easy to be brittle under the action of external force, resulting in the destruction of the airgel network structure. , which severely limits its scope of application. [0003] In order to improve the mechanical properties of silica aerogels to broaden their application...

AI Technical Summary

Problems solved by technology

However, the existence of a large number of methyl groups makes the thermal stability and flame retardancy of flexible silica aerogels relatively poor, which severely limits the application range of flexible silica aerogels.

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