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A temperature-resistant and moisture-proof silica airgel composite material and its preparation method and application

A composite material and silicon dioxide technology, applied in applications, other household appliances, ceramic products, etc., can solve the problems of inability to achieve performance stability and repeatability improvement, and achieve stable and controllable impurity content and room temperature thermal conductivity The effect of low efficiency and good moisture resistance

Active Publication Date: 2021-08-24
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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  • A temperature-resistant and moisture-proof silica airgel composite material and its preparation method and application
  • A temperature-resistant and moisture-proof silica airgel composite material and its preparation method and application

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 method for preparing a temperature-resistant and moisture-proof silica airgel composite material, comprising the following steps: (1) adopting a silicon-containing coupling reagent in the presence of a catalytic amount of a first catalyst to undergo a hydrolysis-polycondensation reaction Prepare a silica sol, and the silicon-containing coupling agent includes a fluorine-containing coupling agent; (2) use the silica sol to impregnate the fiber reinforcement in the presence of a catalytic amount of the second catalyst, through sol- Gel, aging, solvent replacement, and drying to obtain a hydrophobic fiber-reinforced airgel composite. The invention also provides a temperature-resistant and moisture-proof silica airgel composite material and its application. The method of the present invention The method of the present invention has simple process, few operation steps and low equipment cost; the composite material of the present invention has good temperature resistance, especially high temperature resistance, excellent moisture resistance, low thermal conductivity at room temperature, stable thermal conductivity, and stable density. The impurity content is stable and controllable.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02C04B38/00C04B111/27
CPCC04B30/02C04B2111/27C04B2201/20C04B2201/32C04B14/064C04B14/4631C04B38/0045
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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