Preparation method of aerogel

An aerogel and hydrogel technology, which is used in the preparation of silica aerogel and in the field of aerogel preparation, can solve the problem that chemicals cannot be recovered or reused, a large amount of acid and salt-containing wastewater, and unfavorable environment. protection and other issues, to achieve the effect of protecting the ecology and environment, consuming resources, and reducing the cost of raw materials

Inactive Publication Date: 2012-08-15
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But there are the following problems in this process: 1, the consumption of acid (HF or HNO 3 ), alkali (NaOH) and other chemicals, which relatively increase the cost of raw materials; 2. Due to factors such as cost and process, these consumed chemicals cannot be recovered or reused, so a large amount of acid and salt will be produced waste water, not conducive to the protection of the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take a sodium silicate with a Baume degree of 37°Be' (20°C, the same below), add 4 times the amount (weight, the same below) of water to dilute, filter, and measure the diluent containing SiO 2 %=5.0%, Na 2 O%=1.4%, its modulus n=3.7, weighs 600g of this dilute solution, mixes with 600g 3.8% NaHCO under stirring 3 The solution is mixed (the reaction molar ratio is 1:2.0), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, and after standing for 1 day, filter to remove about 600g of washing water, save the washing water for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, let stand, filter, drain, wash the gel several times with ethanol, add the gel to the ethanol solution of TEOS to soak, age for 2 days, drain, and then soak in ethanol for 1 Days later, slowly heat up and dry to obtain about 2...

Embodiment 2

[0037] Take a sodium silicate with a Baume degree of 41°Be', add 3 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 6.7%, Na 2 O% = 2.1%, its modulus n = 3.3, weigh 600g of the dilute solution, mix it with 600g of 2.7% NH under stirring 4 HCO 3 The solution is mixed (the reaction molar ratio is 1:1.0), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, and after standing for 1 day, filter to remove about 600g of washing water, save the washing water for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, stand still, filter, drain, wash the gel with ethanol, then add ethanol and let it stand for 12 hours, wash the gel with ethanol, add ethanol and let it stand, after repeated several times, use supercritical drying After removing the solvent, about 3...

Embodiment 3

[0040] Take a sodium silicate with a Baume degree of 40°Be', add 4 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 5.4%, Na 2 O%=1.8%, its modulus n=3.1, weighs 600g of this dilute solution, under stirring with 650g 4.8% NaHCO 3 The solution is mixed (the reaction molar ratio is 1:2.1), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, after standing for 1 day, filter and wash about 650g of water, save for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, let stand, filter, drain, wash the gel several times with ethanol, drain, add the gel to trimethylchlorosilane (TMCS) and hexamethyldisiloxane (HMDSO ) in the mixed solution of the surface modification treatment, after the modification treatment is completed, slowly heat up and dry, and about 30 ...

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PUM

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Abstract

The invention discloses a preparation method of aerogel. The preparation method comprises the steps of reacting to obtain SiO2 aerogel by taking NaHCO3 or NH4HCO3 and sodium silicate Na2O nSiO2 as materials; and conducting aging, washing, solvent replacement, surface finishing and drying on the aerogel to obtain a silica aerogel product. During the adoption of the technical scheme, since washing liquor recovered after washing mainly contains Na2CO3 or also NH3 H2O, reaction materials can be obtained again by CO2 reaction, and therefore, all chemicals can be recycled, except a silicon source; the material cost of the silica aerogel is lowered; meanwhile consumed resources are reduced; the problems in the prior art inorganic acid or alkali is consumed and then waste water containing acid, alkali and salt is generated so as to cause environment pollution and the like are solved; and emission and environment pollution are reduced.

Description

technical field [0001] The invention relates to a method for preparing airgel, in particular to a method for preparing silica airgel, and belongs to the technical field of new chemical materials. Background technique [0002] Airgel is a lightweight nano-scale porous amorphous material with a continuous random network structure. It is a typical fractal material because of its unique high surface area, low refractive index, low electrical conductivity, low thermal conductivity, Low sound wave propagation velocity, low density and other properties can be widely used in thermal insulation materials, solar collectors, aerospace probes and other fields. [0003] Silica airgel is based on SiO 2 The airgel product with the main component is the most researched, the most mature application and production technology so far, and it is also considered to be the most promising airgel product. [0004] The preparation of silica airgel mainly includes two processes: solution-gel and dry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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