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Method for preparing wave-transmission SiO2 aerogel heat-insulation composite material by using normal-pressure drying equipment

A technology of atmospheric drying and composite materials, which is applied in the field of preparing wave-transmitting SiO2 aerogel thermal insulation composite materials by atmospheric drying, can solve the problems of expensive development prospects, complex equipment, high risk, etc., and can prolong the gel time. , The effect of good sample performance and low cost

Inactive Publication Date: 2013-07-24
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, supercritical drying can effectively avoid the shrinkage and cracking of the material during the drying process, thereby obtaining SiO with a nano-sized network structure. 2 Airgel composite materials, but this method needs to be carried out in a high temperature and high pressure environment, high energy consumption, high risk, complex equipment and expensive factors seriously restrict the wave-transparent SiO 2 The development prospect of large-scale production of airgel thermal insulation composite materials through this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the restoration material of the present invention comprises the following steps:

[0036] (1) First weigh 1.0g of quartz fiber, heat-treat at 100°C for 180min, add 40mL of ethanol mixed solution containing 2.4mL of coupling agent KH-570, stir to mix evenly, let stand for 4h, and dry in an oven at 100°C for later use;

[0037] (2) Measure 27.3mL of absolute ethanol, 18mL of ethyl orthosilicate, and 15mL of high-purity water, and place them in a water bath at 25°C for 20 minutes with magnetic stirring to make them evenly mixed;

[0038] (3) Add dropwise an oxalic acid solution with a concentration of 0.02 mol / L, adjust the pH value to 3.0, continue to stir for 2 hours, and then let stand for 15 hours to fully hydrolyze tetraethyl orthosilicate;

[0039] (4) Add dropwise NH with a concentration of 0.10mol / L 3 ·H 2 O solution, adjust the pH value to 6.0, then add 6mL formamide, stir for 20min to obtain clear SiO 2 Sol;

[0040] (5) the quartz fib...

Embodiment 2

[0047] The preparation method of the restoration material of the present invention comprises the following steps:

[0048] (1) First weigh 1.2g of quartz fiber, heat-treat at 120°C for 120min, add 40mL of ethanol mixed solution containing 2.4mL of coupling agent KH-570, stir to mix evenly, let it stand for 2h, and dry it in an oven at 120°C for later use;

[0049] (2) Measure 27.3mL of absolute ethanol, 15mL of tetraethyl orthosilicate, and 9.5mL of high-purity water, and place them in a water bath at 35°C for 10 minutes with magnetic stirring to make them evenly mixed;

[0050] (3) Add dropwise a dilute HCl solution with a concentration of 0.01mol / L, adjust the pH value to 3.5, continue to stir for 1h, and then let it stand for 10h to fully hydrolyze tetraethyl orthosilicate;

[0051] (4) Add dropwise NH with a concentration of 0.10mol / L 3 ·H 2 O solution, adjust the pH value to 4.5, then add 4mL N,N-dimethylformamide, stir for 30min, and obtain clear SiO 2 Sol;

[0052] ...

Embodiment 3

[0059] The preparation method of the restoration material of the present invention comprises the following steps:

[0060] (1) First weigh 2.0g of quartz fiber, heat-treat at 150°C for 120min, add 50mL of ethanol mixed solution containing 3.3mL of coupling agent KH-560, stir to mix evenly, let it stand for 6h, and dry it in an oven at 85°C for later use;

[0061] (2) Measure 25mL of absolute ethanol, 15mL of ethyl orthosilicate, and 15mL of high-purity water, and place them in a water bath at 50°C for 20 minutes with magnetic stirring to make them evenly mixed;

[0062] (3) Add dropwise a dilute oxalic acid solution with a concentration of 0.04mol / L, adjust the pH value to 3.0, continue to stir for 3 hours, and then let it stand for 15 hours to fully hydrolyze tetraethyl orthosilicate;

[0063] (4) Add NaOH solution with a concentration of 0.08mol / L dropwise, adjust the pH value to 5.0, then add 7mL N,N-dimethylacetamide, stir for 1h, and obtain clear SiO 2 Sol;

[0064] (5)...

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Abstract

The invention discloses a method for preparing a wave-transmission SiO2 aerogel heat-insulation composite material by using normal-pressure drying equipment. According to the method, tetraethoxysilane used as a precursor and absolute ethanol used as a solvent are subjected to acid-alkaline two-step reaction under the action of a catalyst so as to obtain SiO2 sol; and the SiO2 sol is mixed with quartz fiber, and the wave-transmission SiO2 aerogel heat-insulation composite material is prepared by the steps of performing gelling on the mixture of the SiO2 sol and the quartz fiber, aging, performing solvent replacement and surface modification, and performing gradient heating under normal pressure. The method for preparing the wave-transmission SiO2 aerogel heat-insulation composite material by using the normal-pressure drying equipment is easy to operate; equipment is simple; compared with a supercritical drying method, the method for preparing the wave-transmission SiO2 aerogel heat-insulation composite material by using the normal-pressure drying equipment has the advantage that the cost is reduced greatly; by the method, the composite material can be produced on a large scale conveniently; and a product has good wave transmission performance, heat insulation performance and the like, and has extremely obvious application value in military industry of long-endurance and high-mach aviation aerospacecrafts and the like.

Description

technical field [0001] The present invention relates to SiO 2 Airgel composite material, specifically refers to a kind of normal pressure drying to prepare wave-transparent SiO 2 A method for airgel thermal insulation composites. Background technique [0002] Precise strike and high-speed maneuvering flight are the main characteristics and development direction of modern high-performance missile weapons and equipment. The radome, which integrates functions such as heat protection, load bearing, wave penetration and anti-ablation, is an important key to realize precise guidance under high-speed flight conditions. Guarantee is also an indispensable key technology for precision guided weapon systems. At the same time, with the development of aerospace technology and the needs of modern warfare, the flight Mach number of aerospace vehicles continues to increase, and the temperature and thermal shock that the radome at the highest position of the aircraft's aerodynamic force an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24
Inventor 王增奎张志斌佘平江王芬张军雷宁
Owner 湖北三江航天江北机械工程有限公司
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