Secondary drying method for preparing hydrophobic aluminum-silicon aerogel heat-insulation materials

Abstract

The invention provides a secondary drying method for preparing hydrophobic aluminum-silicon aerogel heat-insulation materials. The secondary drying method includes steps of S1, preparing aluminum solby means of hydrolysis by the aid of acid catalysis processes, and impregnating the aluminum sol in fiber reinforced material gel to obtain fiber reinforced aluminum gel; S2, sealing and aging the gel, carrying out ethanol supercritical drying and then carrying out heat treatment; S3, immersing fiber / aluminum aerogel composite materials in alkaline solution, carrying out surface alkaline treatment, carrying out centrifuging and then carrying out drying; S4, preparing silicon sol by means of hydrolysis by the aid of acid catalysis processes, uniformly impregnating the silicon sol in fiber / aluminum aerogel composite material gel to obtain composite materials; S5, immersing the composite materials in alcohol solvents, sealing and aging the composite materials in the alcohol solvents, carryingout solute replacement on the composite materials in the alcohol solvents, then immersing the composite materials in surface modifier solution, carrying out surface treatment on the composite materials in the surface modifier solution and then carrying out secondary ethanol supercritical drying to obtain the aluminum-silicon aerogel heat-insulation materials with the hydrophobic performance. Silicon gel is available on pores of the composite materials obtained at the step S4. The secondary drying method has the advantages that the mechanical properties of the hydrophobic aluminum-silicon aerogel heat-insulation materials can be obviously improved by the aid of the secondary drying method, the hydrophobic aluminum-silicon aerogel heat-insulation materials have the hydrophobic properties, and the excellent high-temperature heat-insulation performance can be kept.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion coating for steel structures, and in particular relates to a secondary drying method for preparing hydrophobic aluminum-silicon airgel heat-insulating materials. Background technique [0002] Airgel is an ultra-light material with a porous nano-network structure, and has the characteristics of high specific surface area, high porosity, low density, low thermal conductivity, etc., so it has excellent thermal insulation properties. At present, the silica airgel material is widely studied and applied. However, when the operating temperature exceeds 800°C for a long time, the specific surface area of ​​the silica airgel decreases sharply, and its thermal insulation performance decreases significantly. The aluminum-based airgel heat insulation material has good heat resistance, and it still maintains good heat insulation performance after long-term use in an aerobic environment at 800-1200 °C. H...

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Problems solved by technology

[0003] In view of this, aiming at the problems of low mechanical properties and poor hydrophobicity of aluminum airgel thermal insulation materials, the present invention provides a secondary drying method for preparing hydrophobic aluminum silicon airgel thermal insulation materials, which significantly improves the mechanical properties of the material improved, has hydrophobicity, and maintains good high-temperature thermal insulation properties