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

A thermal insulation material, silicon aerogel technology, applied in the direction of colloid chemistry, colloid chemistry, chemical instruments and methods, etc., can solve the problems of poor hydrophobicity and low mechanical properties, and achieve improved mechanical properties, good high temperature heat insulation performance, The effect of improving the compressive strength

Active Publication Date: 2019-05-10
HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 hydrop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] This embodiment provides a secondary drying method for preparing a hydrophobic aluminum-silicon aerogel thermal insulation material, and the steps include:

[0029] The mullite / quartz mixed fiber felt (93% mullite, 7% quartz) is used as the reinforcing fiber, which is cut into the mold; the molar ratio of aluminum sec-butoxide:ethanol:deionized water is 1:12: 0.6, 3ml hydrochloric acid per mole of aluminum sec-butoxide is used as a catalyst. After stirring and mixing at 75℃, continue to stir for 180min. After full hydrolysis, cool with cold water to prepare aluminum sol. Add 20% acetic acid / methanol while stirring. The solution is the gel catalyst; then the fiber felt reinforcement material is uniformly impregnated with aluminum sol, the mold is closed, and the gel is sealed to obtain the fiber / aluminum gel; the gel is taken out of the mold and placed in a small amount of isopropanol to seal and age , Replace the isopropanol once every 24 hours, a total o...

Example Embodiment

[0030] Example 2

[0031] This embodiment provides a secondary drying method for preparing a hydrophobic aluminum-silicon aerogel thermal insulation material, and the steps include:

[0032] The aluminum silicate fiber is used as the reinforcing fiber, which is cut into the mold; the molar ratio of aluminum sec-butoxide:ethanol:deionized water is 1:12:0.6, and 3ml hydrochloric acid is used as the catalyst for each mole of aluminum sec-butoxide. After stirring and mixing at 75℃, continue stirring for 180min. After full hydrolysis, cool in cold water to prepare aluminum sol. While stirring, add 20% acetic acid / methanol solution as gel catalyst; evenly impregnate fiber felt reinforcement with aluminum sol , Close the mold, and seal the gel to obtain the fiber / aluminum gel; take out the gel from the mold and place it in a small amount of isopropanol for sealing and aging. Replace the isopropanol once every 24 hours for a total of 3 times; The aluminum gel is placed in an ethanol supe...

Example Embodiment

[0033] Example 3

[0034] This embodiment provides a secondary drying method for preparing a hydrophobic aluminum-silicon aerogel thermal insulation material, and the steps include:

[0035] Quartz fiber is used as the reinforcing fiber, which is cut into a mold; the molar ratio of aluminum sec-butoxide:ethanol:deionized water is 1:12:0.6, and 3ml of hydrochloric acid is used as a catalyst for each mole of aluminum sec-butoxide at 75℃. After stirring and mixing at temperature, continue to stir for 180 minutes. After full hydrolysis, cool in cold water to prepare aluminum sol. While stirring, add 20% acetic acid / methanol solution as a gel catalyst; evenly impregnate fiber felt reinforcement with aluminum sol. Mold and seal the gel to obtain the fiber / aluminum gel; take out the gel from the mold and place it in a small amount of absolute ethanol for sealing and aging. Replace the absolute ethanol once every 24 hours for a total of 3 times; The gel is placed in an ethanol supercrit...

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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...

Claims

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Application Information

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IPC IPC(8): C04B30/02B01J13/00C04B111/27
Inventor 王立东崔西峰桑希军付忠奎路爱梅吴华利沈亚东郑张宜
Owner HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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