Method for preparing hydrophobic silica aerogel

一种二氧化硅、疏水性的技术，应用在二氧化硅、氧化硅、气凝胶制备等方向，能够解决低导热性、热传导率增加等问题，达到高疏水性、高经济性、改善物理性能的效果

Active Publication Date: 2016-03-02
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, dried silica aerogels maintain low thermal conductivity immediately after drying, but this thermal conductivity may gradually increase because of the presence of hydrophilic silanol groups (Si-OH) on the silica surface. absorb moisture from the air

Method used

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  • Method for preparing hydrophobic silica aerogel
  • Method for preparing hydrophobic silica aerogel
  • Method for preparing hydrophobic silica aerogel

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0041] The step 1 of preparing hydrophobic silica airgel according to one embodiment of the present invention is preparing hydrophobic silica wet gel.

[0042] Specifically, a hydrophobic silica wet gel can be prepared by adding a first surface modifier and a second surface modifier, a non-polar organic solvent, and an inorganic acid to a water glass solution, and reacting In this case, an ion exchange resin may further be selectively used.

[0043] For example, the hydrophobic silica wet gel may be prepared by various methods according to the order of adding the above compounds.

[0044] Figures 2A to 2Dare block diagrams respectively showing various methods (methods A to D) for preparing a hydrophobic wet gel during the preparation of a hydrophobic silica airgel according to an embodiment of the present invention. Figures 2A to 2D These are merely examples for describing the present invention, and the scope of the present invention is not limited thereto. Below, will re...

Embodiment 1-1

[0161] Add 120ml of hexane to the water glass solution (comprising 4.35wt% of silicon dioxide) of 100g (about 100ml), and raise the temperature to 50°C to prepare the water glass-non- Polar organic solvent layer separation composition. Thereto, 6 ml of hexamethyldisilazane and 3.6 ml of nitric acid were sequentially added and stirred to obtain a wet gel (pH 7 to 8) modified by the first surface modifier. After 5 minutes, 0.5 ml of nitric acid was further added to the obtained wet gel modified by the first surface modifier, and after 10 minutes, 2.5 ml of methyltrimethoxysilane hydrated at 50 wt % was added , stirred for 3 hours, and reacted to obtain a hydrophobic silica wet gel. In this case, hydrated methyltrimethoxysilane was prepared by mixing 10 g of methyltrimethoxysilane and 10 g of distilled water and stirring for 20 hours.

[0162] The aqueous layer separated from the obtained hydrophobic silica wet gel was removed, and washed by adding 120 ml of hexane. Repeat the...

Embodiment 1-2

[0164] A hydrophobic silica airgel was obtained in the same manner as in Example 1-1 except for adding 1.1 ml of hydrated methyltrimethoxysilane.

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Abstract

The present invention provides: a method for preparing a hydrophobic silica aerogel by using a first surface modifier and a second surface modifier in combination; and a hydrophobic silica aerogel prepared by using the same. A hydrophobic silica aerogel having excellent physical properties and pore properties and high hydrophobicity can be effectively prepared by the preparation method according to the present invention.

Description

technical field [0001] The present invention relates to a method for preparing hydrophobic silica aerogels and hydrophobic silica aerogels prepared by using the method, which can be efficiently prepared with excellent tap density and specific surface area hydrophobic silica airgel. Background technique [0002] As a high specific surface area (≥500m 2 / g), ultra-porous materials, airgel has properties such as ultra-light weight, super-insulation and ultra-low dielectric constant. Due to the excellent physical properties, aerogels have been actively pursued as transparent thermal insulators and environmentally friendly high-temperature thermal insulators, ultra-low dielectric films for highly integrated devices, catalysts and catalyst supports, electrodes for supercapacitors, and Applied research on electrode materials for desalination and development of airgel materials. [0003] The greatest advantage of the airgel is that it has excellent heat insulating properties havi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
CPCB01J13/0091C01B33/1585C01B33/163C01B33/166C01P2006/11C01P2006/12C01P2006/16C01P2006/17C01B33/16C01P2006/32C01P2006/14
Inventor 金美利吴景实金礼训曹东铉金永三柳成旼吴珍姬李悌均
Owner LG CHEM LTD
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