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Method for preparing silicon oxide aerogel pellet at normal pressure at normal pressure

A silicon oxide aerogel, silicon oxide technology, applied in the directions of silicon oxide, silicon dioxide, chemical instruments and methods, etc., can solve the problems of complex oil phase composition, high price, increased cost, etc., and achieves high adsorption rate and adsorption. Good performance and easy recycling

Inactive Publication Date: 2014-06-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A SiO 2 and TiO 2 / SiO 2 Preparation method of airgel microspheres; Chinese invention patents with application numbers 200310109498.7 and 200710175741.3 respectively reported a SiO 2 and TiO 2 / SiO 2 The preparation method of airgel pellets, but the above patents all have some disadvantages: in terms of cost, silica sol is used, which is expensive, and the use of ion exchange resin also increases the production cost virtually, and supercritical drying is expensive, dangerous, and unsafe It is convenient for industrial production; in terms of production process, the oil phase components used in molding treatment are complex, which is not conducive to recycling, and may even cause environmental pollution problems; in terms of products, micron-sized balls are not suitable for the treatment of industrial printing and dyeing sewage, and some normal pressure drying The prepared pellets are hydrophobic and cannot quickly process large quantities of printing and dyeing wastewater

Method used

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  • Method for preparing silicon oxide aerogel pellet at normal pressure at normal pressure
  • Method for preparing silicon oxide aerogel pellet at normal pressure at normal pressure
  • Method for preparing silicon oxide aerogel pellet at normal pressure at normal pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Measure 2.6 mL of glacial acetic acid in a beaker for later use; weigh 16 g of water glass in a beaker, measure 50 mL of cooled deionized water to dilute the water glass for later use; under stirring, drop the water glass into hydrochloric acid, the solution pH About 5.8. The prepared sol was added dropwise into simethicone oil at 75° C. at a height of 15 cm to form silica wet gel beads. The prepared silica wet gel beads were washed with water 4 times, each time for 2 h, at a washing temperature of 50 °C; then, the silica wet gel beads were soaked in absolute ethanol for 4 times, each time for 2 h, and the aging temperature was 50°C; transfer the silica wet gel beads to tetraethyl orthosilicate ethanol solution and soak for 24 h at 50°C; finally soak the silica wet gel beads in n-hexane for 4 times, The immersion temperature was 45°C for 3 hours each time; the silica airgel pellets were prepared by drying the silica wet gel pellets in a desiccator at 30°C.

Embodiment 2

[0035] Measure 2.6 mL of glacial acetic acid in a beaker for later use; weigh 16 g of water glass in a beaker, measure 50 mL of cooled deionized water to dilute the water glass for later use; under stirring, drop the water glass into hydrochloric acid, the solution pH About 5.8. The prepared sol was added dropwise into simethicone oil at a height of 25 cm at 65° C. to form silica wet gel beads. The prepared silica wet gel beads were washed 4 times, 2 h each time, at a washing temperature of 70 °C; then the silica wet gel beads were soaked in absolute ethanol 4 times, 2 h each time, and the aging temperature was 55°C; finally soak the silica wet gel pellets in n-hexane for 4 times, 3 h each time, at a temperature of 35°C; dry the silica wet gel pellets in a desiccator at 30°C to prepare Silica airgel pellets were obtained.

Embodiment 3

[0037] Measure 1.3 mL of glacial acetic acid in a beaker for later use; weigh 8 g of water glass in a beaker, measure 50 mL of cooled deionized water to dilute the water glass for later use; under stirring, drop the water glass into hydrochloric acid, the solution pH About 5.8. The prepared sol was added dropwise into simethicone oil at 85° C. at a height of 15 cm to form silica wet gel beads. The prepared silica wet gel beads were washed with water three times, each time for 2 h, at a washing temperature of 50 °C; then, the silica wet gel beads were soaked in absolute ethanol for four times, each time for 2 h, and the aging temperature was 50°C; transfer the silica wet gel beads to the ethanol solution of tetraethyl orthosilicate and soak for 48 h at a temperature of 55°C; finally soak the silica wet gel beads in n-hexane for 3 times, The immersion temperature was 45°C for 4 hours each time; the silica airgel pellets were prepared by drying the silica wet gel pellets in a...

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Abstract

The invention belongs to the technical field of new material preparation, and particularly relates to a simple and convenient method for preparing a silicon oxide aerogel pellet at normal pressure by utilizing water glass. The diameter of the silicon oxide aerogel pellet is 3-9 mm, the bulk density of the silicon oxide aerogel pellet is 0.142 g / cm<3>, and the specific surface of the silicon oxide aerogel pellet is 419.475-539.627 m<2> / g. The silicon oxide aerogel pellet is fast in adsorption velocity, large in adsorption capacity and convenient to use and can be used for the sewage treatment and the air purification. The preparation process disclosed by the invention is stable and provides the feasible raw material source for massively producing a heat-insulating material, an industrial catalyst and a chromatographic column filling material because the silicon oxide aerogel pellet is low in cost.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and in particular relates to a normal-pressure preparation method of silicon oxide airgel microspheres. Background technique [0002] Airgel is a solid material with a porous structure formed by the aggregation of nanoparticles. It has many excellent properties such as high porosity, low density, large specific surface area, low thermal conductivity, low sound velocity, and low refractive index. These excellent properties make silica aerogels widely used in various fields, such as high-efficiency heat insulation materials, catalysts and catalyst supports, aerospace materials, and rechargeable battery supports. In recent years, with the advancement of technology, the application of silica airgel is expected to achieve new breakthroughs, and it is expected to be used in high-tech fields such as military affairs, housing construction, energy storage, and microelectronics. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B33/16B01J20/10B01J20/28B01J20/30
Inventor 谢吉民宗瑟凯魏巍崔恒律丁当仁侍明近钱坤
Owner JIANGSU UNIV
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