Nanometer Al2O3 composite aerosil thermal-insulation heat-preserving paint and preparation method thereof

Abstract

The invention provides a nanometer Al2O3 composite aerosil thermal-insulation heat-preserving paint. The paint is prepared from the following raw materials by weight: 32 to 35 parts of ethyl orthosilicate, a proper amount of hydrochloric acid, a proper amount of ammonia water, a proper amount of ethanol, a proper amount of deionized water, 4 to 5 parts of trimethylchlorosilane, 0.3 to 0.4 part of tetrabutyl titanate, 0.6 to 0.9 part of nanometer Al2O3, 60 to 65 parts of epoxy resin E-12, 12 to 14 parts of xylene and 7 to 7.5 parts of maleic anhydride. According to the invention, nanometer Al2O3 and silica are compounded to prepare aerogel, so the aerogel has improved high temperature resistance, hardness, dimensional stability and breaking tenacity, the water-absorbing quality of the aerogel is enhanced, the aerogel hardly ruptures, and the disadvantage that the aerogel easily breaks in the case of water absorption; thus, the paint has improved heat-preserving performance and is worth large-scale popularization and application.

Description

Technical field [0001] The invention relates to the field of thermal insulation coatings, in particular to a nano Al 2 O 3 Composite silica aerogel thermal insulation coating and preparation method thereof. Background technique [0002] Silica aerogel is a kind of porous solid material with nano-pores. It has the structural characteristics of low density and high porosity, and has super thermal insulation performance. The silica aerogel microspheres are combined with the film-forming material for coatings to form coatings with super thermal insulation properties. [0003] Most of the current silica aerogels are prepared by the sol-gel method by hydrolyzing silicon sources such as ethyl orthosilicate. The resulting silica aerogels are very easy to absorb moisture and crack when exposed to water, resulting in a nanoporous structure. The damage will affect the performance of the aerogel. Therefore, the silica gel usually needs to be hydrophobically modified during the preparation pro...

AI Technical Summary

Problems solved by technology

[0004] Overhydrophobic silica airgel microspheres are a good thermal insulation material, but due to the large number of non-polar groups on its surface, when it is mixed with a water-based polymer system, its compatibility is poor and the interface thermal resistance is large At the same time, the airgel microspheres are unevenly dispersed and easily agglomerated, resulting in a decrease in the performance of the composite material. Therefore, it is necessary to properly modify the hydrophobic silica airgel microspheres