Silicon dioxide aerogel coating and application thereof

Abstract

The invention discloses a silicon dioxide aerogel coating and application thereof. The silicon dioxide aerogel coating is prepared from the following raw materials in parts by weight: 100 parts of aerogel powder, 2 to 10 parts of layered compound, 10 to 100 parts of water-based coating, 2 to 10 parts of surfactant, 2 to 10 parts of filming additive, and 1 to 5 parts of defoaming agent, and is prepared by the following steps of sequentially stirring the raw materials in parts by weight, and uniformly mixing; the silicon dioxide aerogel coating is coated to the surfaces of walls or metal and plastic substrates by a spraying or rolling method and then is cured into a film. The silicon dioxide aerogel coating and the application have the advantages that the defects in the silicon dioxide aerogel coating of the prior art are overcome; by adding the layered compound into the water-based coating, the dispersivity of the aerogel powder in a water-based medium is improved, so that the uniformity of the coating is improved, and the quality of the finished product is improved; the filming quality of the coating is high, and the heat isolation property is better.

Description

technical field [0001] The invention relates to the technical field of silica airgel coatings, in particular to a silica airgel coating and its application. Background technique [0002] Silica airgel has nanopores and is a porous solid material with low density, high porosity and super thermal insulation properties. The combination of silica airgel microspheres and film-forming materials for coatings forms a coating with super thermal insulation properties. [0003] Most of the current silica aerogels are prepared by hydrolysis of silicon sources such as tetraethyl orthosilicate by using the sol-gel method. The silica aerogels thus obtained are very easy to absorb moisture and crack when exposed to water, resulting in a nanoporous structure. Destroyed, affecting the performance of the airgel. [0004] Therefore, in the preparation process, it is usually necessary to add a necessary gel enhancer to the silica gel. Generally, a polymer or an organic hydrophobic modifier is ...

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Problems solved by technology

[0003] Most of the current silica aerogels are prepared by hydrolysis of silicon sources such as tetraethyl orthosilicate by using the sol-gel method. The silica aerogels thus obtained are very easy to absorb moisture and crack when exposed to water, resulting in a nanoporous structure. Destroyed, affecting the performance of the airgel

[0004] Therefore, in the preparation process, it is usually necessary to add a necessary gel enhancer to the silica gel. Generally, a polymer or an organic hydrophobic modifier is added to strengthen the structure of the gel, but the polymer or organic hydrophobic modifier is filled. The network structure of the gel is affected, thereby affecting the porosity of the airgel, affecting the heat insulation performance and film-forming quality of the airgel coating

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