Super heat insulation coating containing polyimide aerogel microspheres and preparation method thereof

Abstract

The invention relates to a super heat insulation coating containing polyimide aerogel microspheres. The super heat insulation coating is prepared from the following raw materials in parts by weight: 25-30 parts of tetraethoxysilane, a proper amount of hydrochloric acid, a proper amount of ammonium hydroxide, a proper amount of ethyl alcohol, a proper amount of deionized water, 2.2-2.5 part of trimethylchlorosilane, 0.5-0.8 part of 3-aminopropylsilanetriol, 4-5 parts of polyimide aerogel microspheres, 0.1-0.15 part of a silane coupling agent kh-550, 0.2-0.3 part of sulfydryl polysiloxane, 70-75 parts of E-12 epoxy resin, 9-12 parts of ethylene glycol diglycidyl ether and 7-7.5 parts of triethanolamine. According to the preparation method of the super heat insulation coating containing polyimide aerogel microspheres, the polyimide aerogel microspheres and silicon dioxide aerogel are compounded; by virtue of the flexibility of the polyimide aerogel microspheres, the silicon dioxide aerogel can be prevented from being broken and the coating is endowed with the characteristics of lightweight, super heat insulation, superinsulation and the like.

Description

technical field [0001] The invention relates to the field of thermal insulation coatings, in particular to a super thermal insulation coating containing polyimide airgel microspheres 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...

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