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A method for preparing silica airgel composites by single solvent exchange

A technology of composite materials and silica, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as inability to guarantee the integrity of silica airgel, difficulty in maintaining the performance of composite materials, and increased production process costs , to simplify the process of solvent exchange and surface modification, easy to implement, and improve efficiency

Active Publication Date: 2022-03-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a one-step acid-catalyzed method, the integrity of the silica airgel after drying cannot be guaranteed, and silica airgel and TiO are prone to appear. 2 The problem of particle shedding makes it difficult to maintain the performance of composite materials. At the same time, multiple solvent exchanges were carried out during the modification process, which increased the cost of the production process

Method used

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  • A method for preparing silica airgel composites by single solvent exchange
  • A method for preparing silica airgel composites by single solvent exchange
  • A method for preparing silica airgel composites by single solvent exchange

Examples

Experimental program
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Embodiment 1

[0040] A method for rapidly preparing a silica airgel composite material using water glass as a single solvent exchange as a raw material, comprising the following steps:

[0041] (1) get 5.66g modulus of water glass solution (SiO 2 Content is 26.5%) is placed in the beaker, adds deionized water to the total mass of the system is 25g, stirs evenly, obtains SiO 2 A precursor solution with a mass content of 6wt%, followed by adding 1% of the mass of the precursor solution to the rutile-type TiO with a particle size of 1 μm 2 The powder was ultrasonically dispersed, and then concentrated hydrochloric acid with a mass concentration of 37 wt% was added to adjust the pH of the system to 8 to obtain a mixed solution.

[0042] (2) Cut the polyester fiber felt into a cylinder with a diameter of 5 cm and a thickness of 1 cm and put it in a petri dish, pour the mixed solution obtained in step (1) into the petri dish, so that the mixed solution completely submerges the polyester fiber f...

Embodiment 2

[0050] A method for rapidly preparing a silica airgel composite material using water glass as a single solvent exchange as a raw material, comprising the following steps:

[0051] (1) get 5.66g modulus of water glass solution (SiO 2 Content is 26.5%) is placed in the beaker, adds deionized water to the total mass of the system is 25g, stirs evenly, obtains SiO 2 A precursor solution with a mass content of 6wt%, followed by adding 2% of the mass of the precursor solution to the rutile-type TiO with a particle size of 1 μm 2 The powder was ultrasonically dispersed, and then concentrated hydrochloric acid with a mass concentration of 37 wt% was added to adjust the pH of the system to 8 to obtain a mixed solution.

[0052] (2) Cut the polyester fiber felt into a cylinder with a diameter of 5 cm and a thickness of 1 cm and put it in a petri dish, pour the mixed solution obtained in step (1) into the petri dish, so that the mixed solution completely submerges the polyester fiber f...

Embodiment 3

[0057] A method for rapidly preparing a silica airgel composite material using water glass as a single solvent exchange as a raw material, comprising the following steps:

[0058] (1) get 5.66g modulus of water glass solution (SiO 2 Content is 26.5%) is placed in the beaker, adds deionized water to the total mass of the system is 25g, stirs evenly, obtains SiO 2 Content is the precursor solution of 6wt%, then add the rutile type TiO with the particle size of 1 μ m of the precursor solution quality 3% 2 The powder was ultrasonically dispersed, and then concentrated hydrochloric acid with a mass concentration of 37 wt% was added to adjust the pH of the system to 8 to obtain a mixed solution.

[0059] (2) Cut the polyester fiber felt into a cylinder with a diameter of 5 cm and a thickness of 1 cm and put it in a petri dish, pour the mixed solution obtained in step (1) into the petri dish, so that the mixed solution completely submerges the polyester fiber felt, the mixed soluti...

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Abstract

The invention provides a method for quickly preparing silica airgel composite materials by using water glass as a raw material in a single solvent exchange, comprising steps: adding deionized water to the water glass solution and stirring evenly to obtain a precursor solution, and then adding Infrared sunshielding agent, ultrasonically dispersed evenly, then adding an acidic solution to adjust the pH of the system to obtain a mixed solution; adding the mixed solution into a container containing fiber mats, and standing until it forms a gel to obtain a gel composite material; The composite material is added into a mixed solution of alcohol solvent / non-polar solvent / silylation modifier to carry out surface modification treatment, and then is often pressed and dried to obtain the finished product. The invention uses cheap water glass as a silicon source, through one-step acid catalysis, one-time solvent exchange to complete the exchange of non-polar solvent and water in pores, silylation modification, and normal pressure drying to obtain airgel composite material. The obtained airgel material has the characteristics of low density, high porosity, high specific surface area and low thermal conductivity.

Description

technical field [0001] The invention relates to a method for quickly preparing a silica airgel composite material by using water glass as a raw material in a single solvent exchange, and belongs to the technical field of inorganic material synthesis. Background technique [0002] Silica airgel is a unique continuous porous material, which is composed of a three-dimensional mesoporous network of silica nanoparticles. It was originally used in the aerospace field for its excellent thermal insulation properties. With the development of other excellent properties Discovery gradually began to be widely used in biomedicine, adsorption materials, high-energy physics and other fields. However, in the synthesis method of silica airgel, organosilanol is too expensive as a raw material and the technical process of supercritical drying technology is complicated, which limits its wide application in the market, so how to reduce the cost of silica airgel Production cost has become an urg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02C01B33/158C01B33/152
CPCC04B30/02C01B33/1585C01B33/152C04B2201/20C04B2201/32C01P2004/01C01P2004/03C01P2006/10C01P2006/12C01P2006/16C01P2006/32C04B14/064C04B16/0683
Inventor 杨延钊吴文杰
Owner SHANDONG UNIV