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Modified silicon dioxide powder/silicon dioxide nanofiber composite aerogel material and preparation method thereof

A technology of silica powder and composite airgel, which is applied in the field of high-temperature-resistant heat insulation materials, can solve problems such as limited applications, achieve the effects of improving heat insulation performance, increasing filling capacity, and overcoming brittleness

Inactive Publication Date: 2019-05-10
黄金龙
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic nano-silica airgel powder also has excellent thermal insulation performance, but its application is greatly limited due to its powder characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Prepare the slurry of the modified silica airgel powder:

[0032] The first step: stirring the surfactant with a mass fraction of 10% and the solvent of 60% at a speed of 800 rpm for 35 minutes, so that the surfactant is evenly dispersed in the solvent;

[0033] The second step: add 5% silica airgel to the stirred surfactant and solvent mixture in stages, and disperse;

[0034] Step 3: Add 5% modifier to the uniformly dispersed silica airgel slurry, and stir at a speed of 600 rpm for 20 minutes to prepare a modified silica airgel slurry;

[0035] 2) Preparation of silica powder / silica nanofiber composite airgel material:

[0036] a: dissolving the polymer and ethyl tetrasilicate in the first solvent to obtain a precursor solution;

[0037] b: Electrospinning the precursor solution to obtain the precursor silica nanofiber membrane;

[0038] c: calcining the precursor nanofiber membrane to obtain a silica nanofiber membrane;

[0039] d: Disperse the silica nanofibe...

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PUM

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Abstract

The invention provides a modified silicon dioxide powder / silicon dioxide nanofiber cross-gradient composite aerogel material and a preparation method thereof. The modified silicon dioxide powder / silicon dioxide nano fiber cross-gradient composite aerogel material is characterized in that silicon dioxide nano fibers serve as a three-dimensional framework structure of aerogel, modified nano silicondioxide powder is uniformly filled in gaps formed among single nano fibers, the whole composite material is divided into three layers of different nano silicon dioxide powder filling densities in thickness, and by the three-dimensional framework formed by the silicon dioxide nanofibers, good compression resilience and strength are achieved. The three-dimensional silicon dioxide powder / silicon dioxide nanofiber aerogel material has a bulk density of 10-1000 mg / cm<3> and the average pore size of 0.05-1000 mu m, a tensile strength of 20-50 kPa, and a compression resilience is greater than or equal to 85%. According to the inner structure of the obtained aerogel material, silicon dioxide powder is uniformly dispersed in meshes of a three-dimensional frame formed by silicon dioxide fibers, thefibers are mutually staggered and penetrated to form pores, the mechanical strength of the aerogel material is improved, meanwhile, the aerogel material has a high porosity and small pore size structure, and has wide application prospects in the fields of heat insulation, sound absorption, noise reduction and the like.

Description

technical field [0001] The invention relates to the technical field of high temperature resistant heat insulation materials, in particular to a modified silica powder / silica nanofiber composite airgel material and a preparation method thereof. Background technique [0002] As key materials in the fields of spacecraft, missiles, fire protection, and heat transportation, materials with high temperature resistance, flame retardancy, and heat insulation have a wide range of application requirements. Silica airgel powder is a new type of porous functional material with nanoscale solid phase particles and pores, and its continuous three-dimensional network structure can also be controlled and tailored at the nanoscale. Silica airgel has many unique properties, such as high porosity, high specific surface area, low density, ultra-low thermal conductivity, etc. It is currently one of the most widely used high temperature resistant, flame retardant and heat insulating materials; and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 黄金龙
Owner 黄金龙
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