Preparation method of silicon dioxide aerogel water-based heat isolation coating

Abstract

The invention discloses a preparation method of a silicon dioxide aerogel water-based heat isolation coating. The preparation method comprises the following steps of S1, dripping one part of tetraethoxysilane into a mixed solution of 10 parts of ethyl alcohol and 2 to 10 parts of pure water, adding 2 to 5 parts of hydrogen peroxide solution, and then dropwise adding 2 to 5 parts of titanium tetrachloride, so as to prepare a micro-sol solution; S2, adding the micro-sol solution into a spraying chamber with ammonia gas by a spraying method, so as to obtain nanometer gel microspheres; S3, standing and aging; S4, performing CO2 (carbon dioxide) supercritical drying, so as to obtain aero-gel powder; S5, vibrating and screening 100 parts of dry gel powder C into 10 to 100 parts of water-based coating, adding 3 to 8 parts of surfactant, 3 to 8 parts of filming additive and 3 to 8 parts of defoaming agent, and stirring for 2h, so as to obtain the finished product, namely the coating. The prepared aerogel powder has the advantages that the particle size is uniform, the internal porosity is high, the dispersivity in the coating is good, and the like; the filming property and stability are good, the falling is avoided, the heat isolation property and the quality of the finished product are better, and the aerogel powder is suitable for being widely popularized.

Description

technical field [0001] The invention relates to the technical field of preparation methods of airgel thermal insulation coatings, in particular to a preparation method of silica airgel water-based thermal insulation coatings. Background technique [0002] Airgel is a nanoporous lightweight material with controllable structure, which has a nanostructure (holes 1-10nm, skeleton particles 1-20nm), large surface area (up to 800-1000m 2 / g), and high porosity (up to 80-99.8%), and the thermal conductivity can reach below 0.013w / (m·k). The nanoporous structure and nanoparticle network of airgel make the airgel material present the interface effect and small size effect unique to nanomaterials macroscopically. It is a super thermal insulation material with singular performance and high added value. The performance makes it have great application potential in the fields of building energy saving, energy environmental protection, aerospace, oil pipeline, solar heat collection, furna...

AI Technical Summary

Problems solved by technology

[0004] However, the airgel heat-insulating coatings of the prior art adopt large airgel powder particles, uneven particle size distribution, and low porosity, resulting in low airgel coating strength, poor finished product quality, and poor thermal insulation performance. Difference

At the same time, the airgel coating prepared by the existing preparation technology has low light reflectivity and poor film-forming property, so it cannot be used as a heat-insulating coating for exterior walls.

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