Super thermal insulation coating and preparation method therefor

Abstract

A super thermal insulation coating is prepared from the following raw materials in parts by weight: 32-35 parts of ethyl orthosilicate, a proper amount of hydrochloric acid, ammonia water, ethanol and deionized water, 4-5 parts of trimethylchlorosilane, 1-1.5 parts of 3-aminopropylsilanetriol, 0.02-0.05 part of a silane coupling agent KH550, 0.01-0.02 part of sodium lauroyl sarcosine, 0.6-0.8 part of nano boron fiber, 70-75 parts of E-12 epoxy resin, 9-12 parts of ethylene diglycidyl ether, 1.3-1.7 parts of nano calcium carbonate and 7-7.5 parts of diethylenetriamine. According to the super insulation coating provided by the invention, the defect that a silicon dioxide aerogel is hard to break and low in strength is improved by adding modified nano boron fiber. The coating which is modified by using trimethylchlorosilane and 3-aminopropylsilanetriol, the aerogel can be prevented from absorbing water and cracking and the bonding fastness of the aerogel and a film forming substance can be further increased. The coating provided by the invention has a super insulation property and a lot of energy sources can be saved.

Description

technical field [0001] The invention relates to the field of thermal insulation coatings, in particular to a 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 enhance the hydrophobicity...

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