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Method for preparing fiber-reinforced silicon dioxide aerogel

A fiber-reinforced, silica-based technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of low cost of sol materials, achieve excellent product quality, reduce manufacturing costs, and make the manufacturing process simple and fast.

Active Publication Date: 2017-11-10
HUNAN TIANXIN TECH CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

However, the existing aerogels have the disadvantages of less sol materials and higher costs, and aerogels made of different raw materials have different characteristics, and the price of raw materials determines the manufacturing cost of the gel

Method used

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Embodiment Construction

[0015] Below by embodiment the present invention is described in detail:

[0016] The present invention adopts the following preparation method, using orthosilicate as the silicon source, adding alcohols and deionized water to mix, and then adjusting the pH value with hydrochloric acid and ammonia water to obtain silica sol; adding glass fiber felt to impregnate to obtain fiber-reinforced wet coagulation Gel; soak fiber reinforced wet gel in anhydrous tert-butanol for aging and replacement, use trimethylchlorosilane and hexamethyldisiloxane solution to soak and modify, and obtain fiber reinforced silica aerosol by CO2 supercritical drying glue. Its specific preparation method includes the following processes:

[0017] 1. Sol-gel process

[0018] According to the amount of airgel produced at one time, weigh according to the following formula (take the production of 1 cubic airgel as an example)

[0019] Accurately weigh 0.25 tons of tert-butyl orthosilicate, dissolve in 0.6 ...

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Abstract

The invention discloses a method for preparing fiber-reinforced silicon dioxide aerogel. The method comprises the following steps: mixing metasilicic acid butyl ester, tertiary butanol and water according to a ratio, adjusting the pH value through hydrochloric acid and ammonium hydroxide, and compounding with a glass fiber felt so as to obtain wet fiber-reinforced silicon dioxide gel; performing soaking modification with trimethylchlorosilane and hexamethyldisiloxane, and further performing CO2 supercritical drying, so as to obtain hydrophobic fiber-reinforced silicon dioxide aerogel. Novel gel raw materials are used, the channel for preparation of aerogel is further widened, the preparation cost is lowered, moreover, excellent product quality is achieved.

Description

technical field [0001] The invention belongs to a preparation method of airgel, in particular to a preparation method of fiber-reinforced silica airgel. technical background [0002] Airgel, also known as xerogel. When most of the solvent is removed from the gel, so that the liquid content in the gel is much less than the solid content, or the space network structure of the gel is filled with gas, and the appearance is solid, this is xerogel, also called aerogels. Such as gelatin, gum arabic, silica gel, hair, nails, etc. Airgel also has the properties of gel, that is, it has swelling effect, thixotropy effect, and slurry effect. Its preparation method usually consists of sol-gel process and supercritical drying treatment. In the sol-gel process, by controlling the hydrolysis and polycondensation reaction conditions of the solution, nano-clusters of different structures are formed in the solution, and the mutual adhesion between the clusters forms a gel, while around the...

Claims

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Application Information

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IPC IPC(8): C04B30/02C01B33/158C01B33/155
CPCC01B33/155C01B33/1585C04B30/02C04B14/064C04B14/42
Inventor 童垸林
Owner HUNAN TIANXIN TECH CO LTD
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