Machinable silica aerogel composite rigid thermal insulating tile and preparation method thereof

A technology of silica aerogel and silica sol, which is applied in chemical instruments and methods, hydraulic material layered products, layered products, etc. The weight of the thermal tile and the hidden safety hazards are not easy to solve, and the effects of scientific and reasonable preparation method, low cost and improved storage capacity are achieved.

Active Publication Date: 2015-04-08
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most effective drying method for preparing airgel is supercritical drying. However, due to problems such as expensive supercritical drying equipment, potential safety hazards, and difficulty in mass production, the preparation of airgel composite rigid insulation tiles under normal pressure has become a A very promising method; due to the high porosity of the rigid insulation tile, it is easy to absorb water during storage. After absorbing water, it will greatly affect the heat insulation and dielectric properties of the insulation tile, and it will also Unfavorable factors such as increasing the weight of thermal insulation tiles, therefore, the preparation of thermal insulation tiles that are stable and non-moisture-absorbing at room temperature is the key technology to solve the field of thermal insulation materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First measure 20 moles of ethanol, add 5 moles of tetraethyl orthosilicate and 30 moles of deionized water while stirring, after mixing evenly, add 0.002 moles of hydrochloric acid and continue stirring to obtain silica sol; The tiles were dried and weighed for degassing treatment, and then all the prepared sol was filled into the rigid insulation tiles by negative pressure, and the pressure was maintained for 10 minutes, and 0.004 moles of ammonia water was added, and the gel was formed after standing at 50°C for 6 hours. Then add 3 liters of ethanol solvent, so that the gelled material is completely immersed in the ethanol solvent for aging treatment, the aging time is 24 hours; add 3 liters of 10% n-hexane solution of trimethylchlorosilane for hydrophobic treatment , treated for 2 days, and then the gel was cleaned with 3 liters of n-hexane solution each time until the pH of the cleaning solution was 6.5; the rigid insulation tile was taken out from the gel and dried ...

Embodiment 2

[0038] First measure 50 moles of ethanol, add 5 moles of tetraethyl orthosilicate and 15 moles of deionized water while stirring, after mixing evenly, add 0.001 moles of hydrochloric acid and continue stirring to obtain silica sol; The tiles were dried and weighed for degassing, and then all the prepared sol was filled into the inside of the rigid insulation tiles by negative pressure, and the pressure was maintained for 10 minutes, and 0.005 moles of ammonia water was added, and the gel was formed after standing at 50°C for 6 hours. Then add 4.5 liters of ethanol solvent, so that the gelled material is completely immersed in the ethanol solvent for aging treatment, the aging time is 24 hours; add 4.5 liters of 10% trimethylchlorosilane n-hexane solution for hydrophobic treatment, Treat for 2 days, and then wash the gel with 4.5 liters of n-hexane solution each time until the pH of the cleaning solution is 6.5; take out the rigid insulation tile from the gel and dry it at room ...

Embodiment 3

[0041]First measure 400 moles of ethanol, add 50 moles of tetraethyl orthosilicate and 200 moles of deionized water while stirring, after mixing evenly, add 0.01 moles of hydrochloric acid and continue stirring to obtain silica sol; After the tile is dried and weighed, it is degassed, and then the prepared sol is filled into the inside of the rigid insulation tile by negative pressure, and the pressure is kept for 10 minutes, and 0.05 mole of ammonia water is added, and the gel is formed after standing at 50°C for 6 hours. Then add 40 liters of ethanol solvent to make the gelled material completely immersed in ethanol solvent for aging treatment, the aging time is 24 hours; add 40 liters of 10% trimethylchlorosilane n-hexane solution for hydrophobic treatment, Treat for 2 days, and then wash the gel with 40 liters of n-hexane solution each time until the pH of the cleaning solution is 6.5; take out the rigid insulation tile from the gel and dry it at room temperature for 24 hou...

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Abstract

The invention relates to a machinable silica aerogel composite rigid thermal insulating tile and a preparation method thereof. Silica aerogel and a rigid thermal insulating tile are subjected to hydrophobic dry processing after being compounded. The machinable silica aerogel composite rigid thermal insulating tile comprises the ingredient rigid thermal insulating tile, which is the rigid thermal insulating tile of a quartz fiber; the density of the rigid thermal insulating tile is 0.12-0.35g/cm<3>; and the molar ratio of the silica aerogel ingredients, namely the molar ratio of tetraethoxysilane to ethanol to deionized water to catalyst is 1 to (2-10) to (2-12) to (0-0.01). The silica aerogel composite rigid thermal insulating tile prepared by the method is high in porosity and small in aperture, and has a good blocking effect on solid heat transfer, air heat transfer and convection; the preparation method disclosed by the invention is scientific, reasonable, simple, feasible, and convenient to implement; and the prepared self-hydrophobic atmospheric silica aerogel composite rigid thermal insulating tile can be machined into a flat plate, a hood body and other complicated irregular parts.

Description

technical field [0001] The invention relates to a machinable silicon oxide airgel composite rigid heat insulation tile and a preparation method thereof, belonging to the technical field of heat insulation materials. Background technique [0002] With the development of the aerospace industry, the requirements of aircraft for thermal insulation materials are becoming more and more stringent. Thicker and increased weight cannot meet the needs of practical applications. Therefore, the development of airgel thermal insulation composite materials has become the leading direction in the development of high-efficiency thermal insulation materials. Due to its special microstructure such as three-dimensional nanoparticle framework, high specific surface area, nanoscale pores, and low density, airgel can effectively inhibit solid-state heat conduction and gas convective heat transfer, and has excellent thermal insulation properties. It is currently recognized as having the lowest the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B13/02C04B28/24C04B14/42
CPCB32B13/02C04B14/42C04B28/24
Inventor 李勇隋学叶刘瑞祥周长灵王重海杨杰魏美玲
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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