Reinforced silica aerogel super heat insulation coating and preparation method thereof

Abstract

A reinforced silica aerogel super heat insulation coating is prepared from, by weight, 32-35 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, 0.5-0.7 parts of tetrapod-like zinc oxide whisker, 1-1.5 parts of trimethylchlorosilane, 0.4-0.5 parts of polyoxyethylene alcohol ether, 0.01-0.02 parts of lauryldimethylamine oxide, 0.4-0.6 parts of tung oil anhydride, 0.02-0.04 parts of a silane coupling agent KH550, 0.4-0.6 parts of sulfated castor oil, 70-75 parts of E-12 epoxy resin, 9-12 parts of xylene, and 6.8-7.4 parts of diethylenetriamine. Addition of modified tetrapod-like zinc oxide whisker in the invention improves the disadvantages of frangibility and low strength of silica aerogel and solves the problems of contraction, cracking and avalanche of the above provided product in the normal pressure drying process; and the coating has wide application prospect and great industrial popularization values.

Description

technical field [0001] The invention relates to the field of thermal insulation coatings, in particular to a reinforced silica airgel super thermal insulation coating and a preparation method thereof. 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. If it is destroyed, it will affect the performance of airgel. Therefore, in the preparation process, it is usually necessary to carry out necessary hydrophobic modification on silica gel to e...

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