High-toughness silicon oxide aerogel super-adiabatic thermal-insulation coating and preparation method thereof

Abstract

The invention relates to a high-toughness silicon oxide aerogel super-adiabatic thermal-insulation coating. The high-toughness silicon oxide aerogel super-adiabatic thermal-insulation coating is prepared from the following raw materials in parts by weight: 36-40 parts of tetraethylortho silicate, an appropriate amount of hydrochloric acid, ammonia water, ethanol and deionized water, 0.01-0.02 part of azobis isobutyronitrile, 0.2-0.3 part of styrene, an appropriate amount of chlorobenzene, 1-1.5 part of vinyltrimethoxysilane, 0.5-0.9 part of diisocyanate, 70-75 parts of E-12 epoxy resin, 9-12 parts of ethylene glycol dimethyl ether and 7-7.5 parts of triethanolamine. Silicon oxide aerogel is modified with styrene and diisocyanate in the production process so that the strength and toughness of the aerogel are increased, the water absorption is decreased, the breaking phenomenon is avoided, the thermal-insulation property is not affected and the coating can be used as indoor and outdoor wall coating and has broad market space.

Description

technical field [0001] The invention relates to the field of thermal insulation coatings, in particular to a high-toughness 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 ...

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