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Preparation method for hydrophobic silica aerogel

A silicon dioxide and hydrophobic technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of drug toxicity, high price and high cost, and achieve the effects of short preparation time, lower production cost and lower cost.

Inactive Publication Date: 2011-04-20
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using silicate (TEOS, TMOS, etc.) as raw materials can successfully prepare SiO 2 Aerogel, but there are problems such as high price, high cost, and drug toxicity

Method used

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  • Preparation method for hydrophobic silica aerogel
  • Preparation method for hydrophobic silica aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Measure 5ml of industrial water glass (modulus 3.3), dilute with 30ml of deionized water, and filter. 2mol / L dilute sulfuric acid to adjust the pH to 7, let stand at room temperature for 12 hours, and wash with deionized water 4-6 times. Soak in 25ml of absolute ethanol for 12 hours, filter with suction, wash with absolute ethanol twice, soak in 2.5ml of trimethylchlorosilane (TMCS) and 25ml of n-hexane for 12 hours, filter with suction, wash with n-hexane three times, Let stand at room temperature.

[0029] Figure 1 The contact angle diagram of silica airgel, the contact angle is about 130°, the results show that silica airgel is hydrophobic.

Embodiment 2

[0031] Measure 10ml of industrial water glass (modulus 3.3), dilute with 50ml of deionized water, and filter. Adjust the pH to 8 with 2 mol / L dilute hydrochloric acid, let stand at room temperature for 24 hours, and wash with deionized water 4-6 times. Soak in 40ml of absolute ethanol for 24 hours, filter with suction, wash with absolute ethanol twice, soak in 6ml of trimethylchlorosilane (TMCS) and 50ml of n-hexane (n-hexane) for 24 hours, filter with suction, wash with n-hexane for three times, at room temperature stand still.

[0032] Figure 2 SEM image of silica airgel, the results show that silica airgel is a continuous porous network structure.

Embodiment 3

[0034] Measure 10ml of industrial water glass (modulus 3.3), dilute with 50ml of deionized water, and filter. Adjust the pH to 7 with 5 mol / L dilute sulfuric acid, let stand at room temperature for 12 hours, and wash with deionized water 4-6 times. Soak in 40ml of isopropanol for 24 hours, filter with suction, wash with isopropanol twice, soak in 6ml of trimethylchlorosilane (TMCS) and 50ml of n-heptane for 36 hours, filter with suction, wash with n-heptane three times, and let stand at room temperature.

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Abstract

The present invention discloses a preparation method for hydrophobic silica aerogel with industrial waterglass as a raw material, which comprises the following steps: diluting the industrial waterglass with water; neutralizing with an acid to obtain hydrosol; allowing the hydrosol to stand and age for 8-48 hours at normal temperature so as to form hydrogel; replacing the water in the hydrogel with anhydrous ethanol; allowing the hydrogel to react with organosilane compounds; performing surface modification and simultaneous solvent exchange with n-hexane; suction-filtering; washing; allowing to stand at normal temperature to obtain white hydrophobic silica aerogel powder. The preparation method has simple process and low cost, and the prepared aerogel has porous network-like structure which features a low density and a high specific surface area.

Description

technical field [0001] The invention relates to a method for preparing hydrophobic silica airgel, which belongs to the technical field of inorganic porous materials. Background technique [0002] SiO 2 Airgel is a new type of lightweight nanoporous material, which has the characteristics of low density, large specific surface area, and high porosity. It is a new type of nanomaterial with broad application prospects. SiO 2 Airgel has a variety of unique properties, such as low refractive index, low elastic modulus, low acoustic impedance, low thermal conductivity, strong adsorption, typical fractal structure, etc., can be made into acoustic impedance coupling materials, filter Materials, high-temperature insulation materials and other high-performance materials have broad application prospects. [0003] People first used supercritical drying to prepare aerogels because it can maintain the nanoporous structure of aerogels. However, the instruments and equipment required fo...

Claims

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Application Information

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IPC IPC(8): C01B33/14
Inventor 罗仲宽王芳李瑞菲曹慧群邱琦陈雨叁
Owner SHENZHEN UNIV
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