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Low-cost method for preparing aerosil

A silica and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve the effects of easy availability of raw materials, improved performance, and reduced cost of raw materials

Active Publication Date: 2014-09-17
IBIH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are no literature and patent reports on the method of preparing airgel-like materials by adding surfactants instead of solvent replacement and surface modification steps

Method used

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  • Low-cost method for preparing aerosil
  • Low-cost method for preparing aerosil
  • Low-cost method for preparing aerosil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of airgel-like materials

[0026] The ratio of hydrosol, deionized water, catalyst HF and sodium dodecylbenzenesulfonate is 10ml: 30ml: 2.32ml: 0.228g, and each reactant is added in turn under the condition of sufficient stirring, and after standing for a period of time, the condensate is obtained. glue. The gel was first dried in a 35°C incubator for 2 to 3 days, then in a 50°C incubator for 2 to 3 days, and finally at 200°C for 2 hours to obtain block SiO 2 airgel material.

Embodiment 2

[0027] Example 2: Preparation of airgel materials with sodium lauryl sulfate as surfactant

[0028] The ratio of hydrosol, deionized water, catalyst HF and sodium lauryl sulfate is 10ml: 50ml: 7.4ml: 0.6484g. Add each reactant in turn at 40°C with full stirring until the sol is about to gel. , after gelation, dry at room temperature for 4-6 days, then dry in a 35°C incubator for 1-2 days, and then dry in a 50°C incubator for 2-3 days, and finally obtain bulk SiO 2 airgel material. SEM such as figure 1 shown. The elastic modulus of the airgel material at room temperature is about 9.1 MPa (such as figure 2 shown), has excellent mechanical properties. The sample contains -OH, -CH 3 , Si—O—Si and other SiO 2 Airgel typical groups (such as image 3 shown).

Embodiment 3

[0029] Example 3: Preparation of airgel materials with sodium dodecylbenzenesulfonate as surfactant

[0030] The ratio of hydrosol, deionized water, catalyst HF and sodium dodecylbenzenesulfonate is 10ml: 30ml: 2.32ml: 0.2306g, and each reactant is added sequentially under the condition of heating at 35°C and fully stirred, and after standing still, we get gel. The gel is directly placed in the air at room temperature and pressure to dry naturally until the quality does not decrease significantly, and then the bulk SiO can be obtained. 2 airgel material.

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Abstract

The invention belongs to the technical field of nanometer porous material preparation and particularly relates to a low-cost method for preparing aerosol. Low-cost hydrosol serves as a precursor, deionized water serves as a solvent, an acid catalyst is added, surfactants are added, and aerosil with no need of any surface modification and solvent replacement is prepared through a sol-gel process. The aerosil has good heat preservation and heat insulation performances and mechanical performances, the thermal conductivity can be reduced to a lower level, the elasticity modulus can achieve more than 6MPa, and the aerosil has an equivalent mechanical strength with the mechanical strength of traditional fiber composite aerogel. The method is simple in technology, high in operability and applicable to factory large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a low-cost preparation method of silica airgel which replaces cumbersome solvent replacement and surface modification steps in the airgel preparation process by adding a surfactant. Background technique [0002] SiO 2 Airgel is a novel low-density, transparent, and structurally controllable nanoporous material with a continuous three-dimensional network structure. Its density is 3-500mg / cm 3 It is a solid material with the lowest density in the world, with a porosity of up to 99.8%, a pore size between 1-100nm, and a specific surface area of ​​up to 1000m 2 / g. At the same time, it has excellent thermal insulation performance, and its thermal conductivity is extremely low at normal temperature and pressure. It is the solid material with the lowest thermal conductivity known so far, and has broad application prospects in the field of thermal insulation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158
Inventor 王文琴张志华祖国庆沈军周斌杜艾
Owner IBIH ADVANCED MATERIALS CO LTD