Hydrophobic silicon dioxide aerogel composite material with high thermal stability and low calorific value and preparation method thereof
A technology of hydrophobic silica and high thermal stability, which is applied in the fields of chemical instruments and methods, silicon compounds, inorganic chemistry, etc., and can solve the problem of thermal stability and combustion performance without significant improvement and without significant improvement of silica Issues such as thermal stability and combustion performance of airgel composites
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
preparation example Construction
[0033] The invention provides a method for preparing a hydrophobic silica airgel composite material with high thermal stability and low calorific value, comprising the following steps:
[0034] Adding an alcohol solvent, a hydrophobic modifier and an acidic catalyst in sequence to the inorganic silicon source wet gel to perform the first hydrophobic modification to obtain a hydrophobic silica wet gel;
[0035] impregnating the matrix material in the hydrophobic silica wet gel to obtain a pretreated composite material;
[0036] The pretreatment composite material is sequentially dried and heat-treated in a protective atmosphere to obtain the hydrophobic silica airgel composite material with high thermal stability and low calorific value.
[0037] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.
[0038] In the present invention, an alcohol solvent, a hydrophobic modifier and an...
Embodiment 1
[0090] The preparation process of Example 1 and Comparative Example 1 is the same. After obtaining the pretreated composite material, the pretreated composite material was put into a tube furnace filled with argon, and kept at a temperature of 120° C. for 4 hours to obtain a hydrophobic silica airgel composite material. Continue to place the hydrophobic silica airgel composite material in the tube furnace at a heating rate of 10°C / min, raise the temperature to 250°C, heat treatment for 2 hours, and obtain a hydrophobic silica airgel composite material with high thermal stability and low combustion calorific value. Silica airgel composites.
[0091] The performance parameters of the obtained composite material: the size is 100×40×1.5mm, the density is ~0.18g / cm 3 , thermal conductivity ~ 35.6mW / (m k), contact angle ~ 143°, total combustion calorific value (GCV) is 3.6MJ / kg, peak heat release rate (T peak ) is 507°C.
Embodiment 2
[0093] The preparation process of Example 2 is the same as that of Comparative Example 1. After obtaining the pretreated composite material, the pretreated composite material was put into a tube furnace filled with argon, and kept at a temperature of 120° C. for 4 hours to obtain a hydrophobic silica airgel composite material. Put the hydrophobic silica airgel composite in the tube furnace at a heating rate of 10°C / min, raise the temperature to 700°C, heat treatment for 2 hours, and finally obtain a composite material with high thermal stability and low combustion calorific value. Hydrophobic silica airgel composites.
[0094] The performance parameters of the obtained composite material: the size is 100×40×1.5mm, the density is ~0.24g / cm 3 , thermal conductivity ~41.2mW / (m k), contact angle ~133°, total combustion calorific value (GCV) is 3.2MJ / kg, peak heat release rate (T peak ) is 620°C.
PUM
| Property | Measurement | Unit |
|---|---|---|
| density | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More