Silicon dioxide aerogel and preparation method thereof

A silicon dioxide and airgel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of expensive raw materials, toxicity, complex process, etc., and achieve the effect of low price, non-toxicity, and short process

Active Publication Date: 2011-08-31
广州凌玮科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is complex, the raw

Method used

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  • Silicon dioxide aerogel and preparation method thereof
  • Silicon dioxide aerogel and preparation method thereof
  • Silicon dioxide aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a total of four parallel samples

[0017] Take 50g of sodium silicate containing 25% silicon dioxide for each, add 75g of ethylene glycol aqueous solution with a concentration of 1% by weight, and prepare a sodium silicate solution with a silicon dioxide content of 10%, add 20% sulfuric acid solution 31.25g, react at 20°C for 3 hours, adjust the pH value to 2-3 with mineral acid, filter and wash with water until the sodium ion content is below 0.1%. Spray drying and crushing with a pulverizer to an average particle size of 3-5 microns; to obtain silica airgel. Its experimental data are as follows.

Embodiment 1 2

[0018] Embodiment 1 silica airgel physical and chemical properties table

[0019]

Embodiment 2

[0020] Embodiment 2: a total of four parallel samples

[0021] Take 50g of sodium silicate containing 25% silicon dioxide for each, add 33.3g of tap water containing 10% ethylene glycol, and prepare a sodium silicate solution with a silicon dioxide content of 15%, and prepare a sulfuric acid solution with a content of 5%. 125g, react at 40°C, react for 5 hours, adjust the pH value to 2-3, then filter, wash with water, spray dry and pulverize to obtain silica airgel with an average particle size of 5-10 microns. Its experimental data are as follows.

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Abstract

The invention discloses silicon dioxide aerogel and a preparation method thereof. The silicon dioxide aerogel of a three-dimensional network structure is prepared by the step of subjecting alkaline silicate and inorganic acid to neutralization reaction, washing, rapidly dehydrating for drying, and crushing; the aerogel is internally filled with pores of about 20nm and has the silica content (dry basis) of more than 99.0%, the BET (Brunauer, Emmett and Teller) specific surface area of 300-800m<2>/g, the pore space volume of 1.6-3.0, the average granularity of 3-20 mum and the pore volume of 1.7-3.6ml/g. In the invention, the alkaline silicate is used as a silicon source and is subjected to neutralization reaction with the inorganic acid, the raw materials are readily available, cheap and innoxious, and the process flow is short and is easy for industrialization.

Description

technical field [0001] The invention belongs to the field of inorganic thermal insulation materials, and more specifically relates to a preparation method of silica airgel suitable for thermal insulation materials. Background technique [0002] There are many patent reports for the preparation method of silica airgel for heat insulation and heat preservation, such as US2093454 and US3672833, which disclose a preparation method of airgel, using silica sol as a raw material, after forming a gel, and then undergoing ultra-high temperature and high pressure. Critical drying releases moisture to form aerogels. Because the drying method is very complicated, it brings difficulties to the industrialized production of the product. In order to avoid the difficulties caused by supercritical drying, US patents US61721200, US6315971 and Chinese patent CN1158598A use surface modification and solvent replacement to reduce the surface tension in the gel, thereby avoiding the collapse of th...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 胡湘仲胡伟民赵正云
Owner 广州凌玮科技股份有限公司
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