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Efficient thermal-insulation aerogel composite plate and preparation method thereof

A composite sheet and airgel technology, applied in the field of heat insulation materials, can solve problems such as large loss of fiber strength, difficulty in holding pressure, and heat insulation effect that cannot meet the requirements of use, and achieves easy implementation, scientific and reasonable preparation methods, and good performance. The effect of heat insulation effect

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

The two methods have their own advantages and disadvantages. The former matrix sol and fibers can be fully mixed, and the fluidity is good, but it is difficult to add pressure, and the fiber strength is greatly lost during the preparation process; The strength loss is small, but due to the influence of the sol penetration force, the fluidity and the miscibility between the bundles are slightly poor
The diameter of the fiber currently used is relatively thick, and the heat insulation effect cannot meet the requirements of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Take 5 moles of tetraethyl orthosilicate and 50 moles of alcohol respectively, put them into a large plastic box, stir with an electric stirrer for 30 minutes, fully mix tetraethyl orthosilicate and alcohol, and then measure 20 moles Slowly add distilled water into the mixed solution, adjust the pH value of the solution to 3 with hydrochloric acid, and continue stirring for 30 minutes to form a sol;

[0038] (2) The fiber mat is shaped into a flat plate; the density of the fiber mat used is 0.08g / cm 3 , with an average fiber diameter of 2 μm.

[0039] (3) The prepared sol is siphoned into the shaped fiber mat by vacuum siphoning, and the pH value of the sol is adjusted to 6 with ammonia water to make it gel; wherein, the total volume of the airgel is twice the volume of the fiber mat;

[0040] (4) Add 4.5 liters of alcohol and put it in an oven at 50°C for aging for 2 days;

[0041] (5) Put the gel-aged fiber mat into an autoclave for supercritical drying, the dry...

Embodiment 2

[0045] (1) Take 5 moles of tetraethyl orthosilicate and 40 moles of alcohol respectively, put them into a large plastic box, stir with an electric stirrer for 30 minutes, fully mix tetraethyl orthosilicate and alcohol, and then measure 20 moles Slowly add distilled water into the mixed solution, adjust the pH value of the solution to 3.5 with hydrochloric acid, and continue stirring for 30 minutes to form a sol;

[0046] (2) The fiber mat is shaped into a flat plate; the density of the fiber mat used is 0.10g / cm 3 , with an average fiber diameter of 1 μm.

[0047] (3) The prepared sol is siphoned into the shaped fiber mat by vacuum siphoning, and the pH value of the sol is adjusted to 6.5 with ammonia water to make it gel; wherein, the total volume of the airgel is 2.5 times the volume of the fiber mat;

[0048] (4) Add 4 liters of alcohol and put it in an oven at 60°C for aging for 1 day;

[0049] (5) Put the gel-aged fiber mat into an autoclave for supercritical drying, th...

Embodiment 3

[0053] (1) Take 5 moles of tetraethyl orthosilicate and 20 moles of alcohol respectively, put them into a large plastic box, stir with an electric stirrer for 30 minutes, fully mix tetraethyl orthosilicate and alcohol, and then measure 20 moles Slowly add distilled water into the mixed solution, adjust the pH value of the solution to 4 with hydrochloric acid, and continue stirring for 30 minutes to form a sol;

[0054] (2) The fiber mat is shaped into a flat plate; the density of the fiber mat used is 0.12g / cm 3 , the average fiber diameter is 3 μm;

[0055] (3) The prepared sol is sucked into the fiber mat by vacuum siphoning, and the pH value of the sol is adjusted to 7 with ammonia water to make it gel; wherein, the total volume of the airgel is 3 times the volume of the fiber mat;

[0056] (4) Add 3 liters of alcohol and put it in an oven at 55°C for aging for 3 days;

[0057] (5) Put the gel-aged fiber mat into an autoclave for supercritical drying, the drying medium is e...

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Abstract

The invention belongs to the technical field of thermal-insulation materials and particularly relates to an efficient thermal-insulation aerogel composite plate and a preparation method thereof. The aerogel composite plate is prepared from a thermal-insulation material matrix and aerogel, wherein the thermal-insulation material matrix is a fiber mat of which the density is 0.09-0.12g / cm<3>, and the diameter of the fiber is 1-3mu m; the aerogel is prepared from tetraethylortho silicate, alcohol and distilled water at a molar ratio of 1: (4-10): (2-6); and the total volume of the aerogel is 1.5-3 times of the volume of the fiber mat. The aerogel composite plate has the characteristics of high efficiency and thermal insulation; and the preparation method is simple in process and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of heat-insulating materials, and in particular relates to a high-efficiency heat-insulating airgel composite plate and a preparation method thereof. Background technique [0002] With the acceleration of the flight speed of the aircraft, the flight altitude until it enters orbit, and the long time of passing through the atmosphere, the temperature it bears is higher, and the aerodynamic heating is more demanding. It is necessary to develop new high-efficiency heat insulation materials with high temperature resistance. Therefore, how to prepare a high-efficiency thermal insulation material has become the key to thermal insulation technology. [0003] 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 therm...

Claims

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Application Information

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IPC IPC(8): C04B30/02
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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