Temperature-resistant and moisture-proof silica aerogel composite material and preparation method and application thereof

A composite material and silica technology, which is applied in the field of temperature-resistant and moisture-proof silica aerogel composite materials and their preparation, can solve the problems such as the inability to achieve performance stability and repeatability improvement, and meet the requirements of repeated use. Stable performance, breaking through the hydrophobic temperature limit, good temperature resistance

Active Publication Date: 2019-04-16
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All in all, the current hydrophobization treatment methods cannot achieve the expected improvement in performance stability and reproducibility

Method used

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  • Temperature-resistant and moisture-proof silica aerogel composite material and preparation method and application thereof
  • Temperature-resistant and moisture-proof silica aerogel composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dissolve tridecafluorooctyltrimethoxysilane, methyl orthosilicate, formic acid, and deionized water in a molar ratio of 10:50:4.8:240 in a 600 molar equivalent ethanol solution, and stir at room temperature for 12 hours. Set the density to 0.1g / cm 3 Put the prefabricated body of quartz fiber felt into the mold, and use the vacuum pressure molding method to compound the above-mentioned silica sol with the prefabricated body under the condition of alkali catalysis (controlling the pH value between 8 and 9), and then aging at room temperature 36h, 90°C high-temperature aging for 36h, acetone solvent replacement 3 times after aging, and supercritical carbon dioxide drying to obtain fiber-reinforced silica airgel composite materials. After testing, the density of the prepared material is 0.25g / cm 3 , The temperature resistance is 600°C, the thermal conductivity at room temperature is 0.021W / m.K (according to the standard GB / T 10295-2008), and the moisture absorption rate of...

Embodiment 2

[0051] Carried out in the same manner as in Example 1, the difference is that tridecafluorooctyltrimethoxysilane is not added in step (1), but methyl orthosilicate is used instead of tridecafluorooctyltrimethoxy Silane, so that tridecafluorooctyltrimethoxysilane, methyl orthosilicate, formic acid, and deionized water are dissolved in 600 molar equivalents of ethanol solution in a molar ratio of 0:60:4.8:240; in addition, no Surface Modification. It was found that the hydrophobic effect of the product was poor, and the sample did not have a moisture-proof effect (according to the standard GB / T 21655.1-2008). The inventor also observed the moisture absorption rate of the composite sample after 600°C / 3600s / 10 times of use, and the results are shown in Table 1 below.

Embodiment 3

[0053] Carried out in substantially the same manner as in Example 1, the difference is that the treated material is further placed in a closed container after being placed at room temperature, and a catalytic amount of formic acid solution and 5% by mass of pentafluorophenyltrimethylpentamethamine accounting for the total amount of the material are added. Oxysilane is subjected to hydrophobization treatment after vacuuming, the treatment temperature is 50° C., and the treatment time is 8 hours, and then dried by vacuuming to obtain a fiber-reinforced silica airgel composite material. After testing, the density of the obtained material is 0.24g / cm 3 , The temperature resistance is 600°C, the thermal conductivity at room temperature is 0.022W / m.K (according to the standard GB / T 10295-2008), and the moisture absorption rate of the spherical heat shield after repeated use at 600°C is 3.6% (according to the standard GB / T 21655.1- 2008), the reusability of the material is significan...

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Abstract

The invention relates to a preparation method of a temperature-resistant and moisture-proof silica aerogel composite material. The preparation method comprises the following steps that (1) in the presence of a catalytic quantity of first catalysts, a silicon-containing coupling reagent is adopted for a hydrolysis-polycondensation reaction to prepare silica sol, wherein the silicon-containing coupling reagent contains a fluorine-containing coupling agent; (2) in the presence of a catalytic quantity of second catalysts, fiber reinforcements are impregnated with the silica sol, and sol-gel treatment, aging, solvent replacement and drying are conducted to obtain the hydrophobic fiber-reinforced aerogel composite material. The invention further provides the temperature-resistant and moisture-proof silica aerogel composite material and application thereof. The method has the advantages that the process of the method is simple, few operation steps are needed, and the equipment cost is low; the composite material has good temperature resistance, especially high-temperature resistance, excellent moisture proofing performance, low thermal conductivity at room temperature, adjustable densityand stable and controllable impurity content.

Description

technical field [0001] The invention belongs to the technical field of heat protection, and more specifically relates to a temperature-resistant and moisture-proof silica airgel composite material and its preparation method and application. Background technique [0002] Airgel is a lightweight material with a unique nanometer three-dimensional porous network structure. It is the solid substance with the lowest thermal conductivity known so far, and is known as a super thermal insulation material. Silica airgel is the most commonly used airgel material. It has the characteristics of high porosity, large specific surface area and rich content of hydrophilic groups on the surface. It is easy to absorb moisture in the air and affect the thermal insulation performance of the material. . Therefore, hydrophobization treatment is usually required during the production of silica airgel materials to increase its stability and service life in the air. [0003] At present, it has been...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00C04B111/27
CPCC04B30/02C04B2111/27C04B2201/32C04B2201/20C04B14/064C04B14/4631C04B38/0045
Inventor 黄红岩张恩爽刘韬雷朝帅贺丽娟赵英民李文静
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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