Preparation method of SiO2 aerogel-filled carbon aerogel

A carbon aerogel and aerogel technology, applied in the field of carbon aerogel preparation, can solve the problems of high cost and poor durability, and achieve the effects of difficult absorption, simple equipment, and good safety performance

Active Publication Date: 2014-11-05
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, the application of airgel is restricted by two factors: (1) the high porosity of aerogel makes this material very fragile and poor durability in the actual application environment; (2) Supercritical drying technology is commonly used in the gel preparation process, which involves high temperature and high pressure, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A filled SiO 2 The preparation method of the carbon airgel of airgel is characterized in that comprising the steps of following sequence:

[0022] (1) Preparation of carbon airgel: Weigh 10g of resorcinol and 20g of formaldehyde solution into a beaker, add 0.02g of sodium carbonate and distilled water to 100ml, stir to mix the solution evenly and adjust the pH value to 9; Add 5g of carbon foam, ultrasonically oscillate for 10min, transfer to a flat-bottomed flask and seal; age in a water bath at 90°C for 3 days to obtain a dark red wet gel; dry the wet gel in air at 50°C for 24h; then dry thoroughly in supercritical petroleum ether After carbonization in a tube furnace, pure N 2 protection and carbonization at 1000°C for 2 hours to obtain carbon airgel with carbon foam as the skeleton.

[0023] (2) Carbon airgel surface acid treatment: H 2 o 2 : NH 3 h 2 O:H 2 O was formulated into 500ml of a mixed solution at a volume ratio of 1:1:5, and the above-mentioned carb...

Embodiment 2

[0032] A filled SiO 2 The preparation method of the carbon airgel of airgel is characterized in that comprising the steps of following sequence:

[0033] (1) Preparation of carbon aerogel: Weigh 10g of resorcinol (R) and 20g of formaldehyde solution (F) into a beaker, add 0.02g of sodium carbonate (C) and dilute to 100ml with distilled water, stir to make the solution Mix well and adjust the pH value to 9; add 5g of carbon foam, oscillate ultrasonically for 15min, transfer to a flat-bottomed flask and seal; age in a water bath at 90°C for 3 days to obtain a dark red wet gel; dry the wet gel in air at 50°C for 24h ; put into the tube furnace carbonization after drying thoroughly in supercritical petroleum ether, pure N 2 protection and carbonization at 800°C for 3 hours to obtain carbon airgel with carbon foam as the skeleton.

[0034] (2) Carbon airgel surface acid treatment: H 2 o 2 : NH 3 h 2 O:H 2 O was formulated into 500ml of a mixed solution at a volume ratio of 1...

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Abstract

The invention discloses a preparation method of SiO2 aerogel-filled carbon aerogel. The preparation method is characterized by comprising the following steps: (1) preparing carbon aerogel, namely taking resorcinol (R) and formaldehyde (F) as precursors (the molar ratio of R to F is 1 : 2), anhydrous sodium carbonate as a catalyst and carbon foam as a framework, and preparing the carbon aerogel based on the carbon foam; (2) performing acid treatment on the surface of the carbon aerogel, namely mixing H2O2, NH3H2O and H2O according to a volume ratio of 1 : 1 : 5 to form a mixed solution, and soaking the carbon aerogel in the mixed solution under the water-bath condition at 90 DEG C for 1 hour; (3) preparing a SiO2 precursor solution, soaking the carbon aerogel in the precursor solution, ageing and drying to obtain the SiO2 aerogel-filled carbon aerogel. The preparation method is reliable and good in safety; the prepared composite aerogel keeps good performances of the aerogel and improves the mechanical performance of the aerogel; the surface of the composite aerogel is hydrophobic, so that moisture in the air is not easily absorbed and the shrinkage rate is low.

Description

technical field [0001] The present invention relates to the preparation method of gel, relate in particular to a kind of filling SiO2 2 Airgel carbon aerogel preparation method. Background technique [0002] In 1931, Kistler replaced the position of the liquid component in the gel with gas, notifying the wall to keep the gel from collapsing, and prepared the world's first aerogel. This solid material is the man-made substance with the lowest density known in the world, known as "solid smoke". In addition to the extremely low apparent density (0.003~0.3g / cm 3 ), airgel also has high porosity (80% ~ 99.8%), extremely low thermal conductivity (10 ~ 40mW / m k) and large specific surface area (100 ~ 1600m 2 / g) and other characteristics. [0003] Due to these outstanding properties, aerogels are expected to be "magical materials that change the world" and have broad application prospects in many fields. Such as heat insulation materials, sound insulation materials, optical de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
Inventor 陈照峰聂丽丽
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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