Preparation method of flexible silica aerogel

A silicon dioxide and aerogel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of expensive silicon source precursor, complex supercritical system, complicated preparation process, etc., to avoid the generation of a large amount of waste liquid, The effect of shortening the preparation cycle and simplifying the synthesis process

Active Publication Date: 2014-04-09
ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] At present, the main problems facing the industrialization of silica airgel include: complex preparation process, long preparation cycle, large solvent consumption, large amount of waste liquid, high-risk and harsh conditions of supercritical drying, expensive silicon source precursors, gas Low gel strength, high brittleness, easy to break, etc.
However, supercritical systems are complex and difficult to industrialize

Method used

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  • Preparation method of flexible silica aerogel
  • Preparation method of flexible silica aerogel
  • Preparation method of flexible silica aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0026] According to the volume ratio of raw materials MTES: ethanol: water = 1: 3: 0.36, mix the three raw materials evenly, add hydrochloric acid solution to adjust the pH of the mixed solution = 2 ~ 3, add ammonia solution to obtain a sol, and let the sol stand to gel. Then place it in absolute ethanol for aging, the aging temperature is 50° C., and dry after aging. Wherein, by volume ratio, ammonia water: MTES=1:50.

[0027] Among them, the drying process is as follows: the gel sample is kept at 80°C for 5h, heated to 120°C at a rate of 1°C / min, and kept at 7h to obtain a flexible silica airgel.

[0028] The prepared flexible silica airgel has a density of 0.12 g / cm 3 .

Embodiment 2

[0030] According to the raw material volume ratio MTMS: ethanol: water = 1: 4: 0.54, add hydrochloric acid solution to adjust the pH of the mixed solution = 2 to 3, add ammonia solution to obtain a sol, put the silica sol to stand for gelation, and then The wet gel was aged in absolute ethanol at a temperature of 60° C., and then dried under normal pressure after aging. Wherein, according to volume ratio, ammonia water: MTMS=1:10.

[0031] The drying process is as follows: the gel sample is kept at 60°C for 5 hours, heated to 120°C at a rate of 1°C / min, and held for 7 hours to obtain a flexible silica airgel.

[0032] The density of the flexible silica airgel prepared is 0.11g / cm 3 .

Embodiment 3

[0034] Raw material volume ratio: MTES: ethanol: water = 1: 3.5: 0.36, add hydrochloric acid solution to adjust the pH of the mixed solution = 2 ~ 3, add ammonia solution, let the silica sol stand for gelation, and then place the wet gel in Aging is carried out in absolute ethanol, the aging temperature is 50° C., and the temperature is raised and dried under normal pressure after aging. Wherein, according to volume ratio, ammonia water: MTES=1:10.

[0035] Drying process is with embodiment 1.

[0036] The density of the flexible silica airgel prepared is 0.15g / cm 3 .

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Abstract

The invention discloses a preparation method of a flexible silica aerogel, relating to a silica aerogel. The invention provides the preparation method of the flexible silica aerogel, which takes methyl alkoxy-series silane as a silicon source precursor. The preparation method comprises the steps of mixing methyl trimethoxysilane or methyl trimethoxysilane, an anhydrous ethanol solution and water, further adding hydrochloric acid, regulating the pH value of the solution to 2-2.5, then adding ammonia water to obtain a sol, standing, then preparing a wet gel, further aging the wet gel, and then drying to prepare the flexible silica aerogel. The prepared flexible silica aerogel has the advantages of low density and high porosity, and simultaneously overcomes the shortcomings of poor integrity and great brittleness. According to the preparation method, the complicated steps of complex solvent exchange and gel modification are not required, so that the operation is simple and easy, the process is controllable, the cost is low, the period is short, and the continuous production can be realized.

Description

technical field [0001] The invention relates to silica airgel, in particular to a preparation method of flexible silica airgel. Background technique [0002] Silicon dioxide (SiO 2 ) Airgel is a solid phase particle, a new type of porous functional material whose pore size is on the nanometer scale, and the continuous three-dimensional network structure can be controlled and tailored at the nanometer scale. Silica airgel has many unique properties, such as high specific surface area, high porosity, high thermal insulation, low density, ultra-low dielectric constant and low refractive index, etc., and its properties can be improved with the control of its structure. Continuous adjustability. The excellent performance of silica airgel makes it have broad application prospects in the fields of thermal insulation, thermal insulation, aerospace, catalyst and its carrier, energy saving and environmental protection, petrochemical industry, drug release and so on. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 程璇邵再东
Owner ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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