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Preparation method for aerogel

An aerogel and gel technology, applied in the field of biochemistry, can solve the problems of safety risks for personnel and the environment, non-conformity with green production, safety and environmental protection disadvantages, etc., to reduce use and pollution discharge, production safety, and pollution reduction. the effect of emissions

Inactive Publication Date: 2017-09-12
徐文忠 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the modified production process of airgel, the raw materials used in the replacement liquid used in the conventional process are n-hexane and ethanol, etc. The raw materials used involve dangerous and toxic chemicals, which are extremely unfavorable to safety and environmental protection, and the solution replacement process is generally Using two-step or three-step replacement, the amount of sewage is large
These toxic and flammable chemicals pose safety risks to personnel and the environment during production operations, and do not meet the requirements of green production such as environmental protection and safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of aerogel adopts the following steps in the process of its modification processing:

[0026] (1) After mixing the organosilicon solution and isopropanol at a ratio of 1:1.5, adjust the pH value to 3 with acetic acid to obtain a gel pre-liquid; put the gel pre-liquid and the replacement liquid into the replacement tank in turn performing replacement to form a wet gel, and the replacement fluid is glycerol and polyethylene oxide;

[0027] (2) The wet gel is dried to obtain an aerogel.

Embodiment 2

[0029] A kind of preparation method of aerogel adopts the following steps in the process of its modification processing:

[0030] (1) After mixing the organosilicon solution and isopropanol at a ratio of 1:1.5, adjust the pH value to 4 with acetic acid to obtain a gel pre-liquid; put the gel pre-liquid and the replacement liquid into the replacement tank in turn , under the condition that the temperature in the replacement tank is 80 ° C for 5.5 hours, to form a wet gel, and the replacement liquid is glycerol and polyethylene oxide;

[0031] (2) The wet gel is dried to obtain an aerogel.

Embodiment 3

[0033] A kind of preparation method of aerogel adopts the following steps in the process of its modification processing:

[0034] (1) After mixing the organosilicon solution and isopropanol at a ratio of 1:1.5, adjust the pH value with acetic acid to 3.5 to obtain a gel pre-liquid; put the gel pre-liquid and the replacement liquid into the replacement tank in turn , under the condition that the temperature in the replacement tank is 65 ° C for 5 hours, to form a wet gel, and the replacement liquid is glycerol and polyethylene oxide;

[0035] (2) drying the wet gel, the drying temperature is minus 5° C., the vacuum degree of freeze-drying is 30000 Pa, and the freeze-drying time is 12 hours to obtain an aerogel.

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Abstract

The invention relates to a preparation method for an aerogel. The method comprises the steps: using glycerol and polyoxyethylene as displacement liquid, replacing gel prepad fluid in a replacement tank to form a wet gel and further drying to obtain an aerogel. The preparation method for the aerogel has the beneficial effects that the preparation method of the areogel selects the glycerol and the polyoxyethylene as the displacement liquid and to replaces n-hexane and ethanol, only one step replacement process is used to obtain the areogel with excellent performance and long service life. The preparation method of the aerogel uses safe and environmentally-friendly raw materials to reduce the use of dangerous chemicals and pollution discharge, so that the production of aerogel is safer and more environmentally environment-friendly, the production cost is reduced, the safe operation of production is ensured, the pollution of volatile chemicals in the production environment is reduced, the air quality of the production environment is improved, the process is simplified, and the emissions of pollutants are reduced.

Description

technical field [0001] The invention belongs to the technical field of biochemistry, and in particular relates to a preparation method of aerogel. Background technique [0002] Aerogels are also known as xerogels. When most of the solvent is removed from the gel, the liquid content in the gel is much less than the solid content, or the medium filled in the space network structure of the gel is gas, and the appearance is solid, also known as aerogel. Aerogel is a form of solid matter, one of the least dense solids in the world. [0003] The preparation of aerogels usually consists of a sol-gel process and a supercritical drying process. In the sol-gel process, by controlling the hydrolysis and polycondensation reaction conditions of the solution, nano-clusters with different structures are formed in the solution, and the clusters adhere to each other to form a gel, while around the solid skeleton of the gel, Filled with liquid reagents left over from chemical reactions. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01F7/44C01G23/08
CPCC01B33/1585C01F7/44C01G23/08C01P2004/60C01P2006/10C01P2006/12C01P2006/17
Inventor 徐文忠
Owner 徐文忠
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