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Mechanical-enhanced SiO2 aerogel material and preparation method thereof

A silicon dioxide, reinforced technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve problems such as unsatisfactory effect and not effectively solved, achieve tight skeleton structure, improve elastic modulus, and high degree of particle accumulation Effect

Inactive Publication Date: 2015-07-08
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they are preparing high performance SiO 2 A lot of work has been done on airgel, but improving SiO 2 The effect of the airgel structure is not very satisfactory, and the problem of adjusting the microstructure to improve the mechanical properties of the material has not been effectively solved

Method used

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  • Mechanical-enhanced SiO2 aerogel material and preparation method thereof
  • Mechanical-enhanced SiO2 aerogel material and preparation method thereof
  • Mechanical-enhanced SiO2 aerogel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first step is to use methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid according to the molar ratio of 1: 2.4: 1.5: 10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the rate of hydrolysis, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), the size of colloidal particles Smaller; the second step reaction is to mix CS with acetonitrile, water and ammonia according to the volume ratio of 1:5: 1.2: 0.02 (A) and 1:50: 2.5: 0.06 (B).

[0031] Stir the high-concentration A sol and low-concentration B sol for 30 min, and then pour the sols into a polytetrafluoroethylene-lined stainless steel shell hydrothermal kettle. The hydrothermal kettle was placed in a constant temperature box at 50° C. and kept warm for 24 hours. After this process, the high concentration A sol and t...

Embodiment 2

[0035] The first step is to use methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid according to the molar ratio of 1: 2.2: 1.3: 10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the rate of hydrolysis, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), the size of colloidal particles Smaller; the second step reaction is to mix CS with acetonitrile, water and ammonia according to the volume ratio of 1:5: 1.2: 0.02 (A) and 1:50: 2.5: 0.06 (B).

[0036] Stir the high-concentration A sol and low-concentration B sol for 40 min, and then pour the sols into a polytetrafluoroethylene-lined stainless steel shell hydrothermal kettle. The hydrothermal kettle was placed in a thermostat at 40° C. and kept warm for 24 hours. After this process, the high concentration A sol and the low conce...

Embodiment 3

[0040] In the first step, the molar ratio of methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid is 1: 2.8: 1.4: 4×10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the rate of hydrolysis, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), the size of colloidal particles Smaller; the second step reaction is to mix CS with acetonitrile, water and ammonia according to the volume ratio of 1:5: 1.2: 0.02 (A) and 1:50: 2.5: 0.06 (B).

[0041] Stir the high-concentration A sol and low-concentration B sol for 30 min, and then pour the sols into a polytetrafluoroethylene-lined stainless steel shell hydrothermal kettle. The hydrothermal kettle was placed in a constant temperature box at 60° C. and kept warm for 18 hours. After this process, the high concentration A sol and the low conce...

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Abstract

The invention relates to a mechanical-enhanced SiO2 aerogel material and a preparation method thereof. According to the method, the mixed SiO2 aerogel with a changed microstructure is successfully prepared by mixing two different concentrations of SiO2 sols via a process (sol coagulation method) capable of performing gelling on the SiO2 sols simultaneously, wherein the elasticity modulus of the mixed SiO2 aerogel is 5.53MPa. Thus, compared with the traditional aerogel, the mechanical property of the mixed SiO2 aerogel provided by the invention is nearly doubled, namely, the mixed SiO2 aerogel has the excellent mechanical property. The specific surface area of the SiO2 aerogel is 882g / cm<3> and the average pore size of the SiO2 aerogel is 28nm due to that the skeleton strength in the network structure of the SiO2 aerogel is further enhanced at the same time when the gel pore structure distribution of the SiO2 aerogel is changed by the sol coagulation method. Thus, the SiO2 aerogel prepared by using the synthesis method has the special porous nanostructure and the excellent mechanical property. As a result, the application value and the application potential of the SiO2 aerogel in the fields of photoelectric devices, gas sensitive sensors, heat insulation and the like are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a preparation method of a mechanically enhanced silica airgel material. Background technique [0002] SiO 2 As a special nanoporous material, airgel has many excellent characteristics, such as: low density, high surface area, high optical transparency, low refractive index and extremely low thermal conductivity. Due to these special properties, SiO 2 Aerogels have received more and more attention in the past few decades, and they have important application potentials in many aspects, such as Cerenkov detectors, insulation of walls and windows, heat storage devices, and acoustic impedance materials. Wait. However, its own brittle skeleton, loose structure, and low strength limit the application of this material in many aspects, such as: load-bearing applications, especially when the external load exceeds the fracture stress. [0003] Therefore, a lot of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
Inventor 刘光武赵斌何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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