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A kind of anti-oxidation carbon airgel composite material and its preparation method and application

A technology of composite materials and carbon airgel, which is applied in the direction of airgel preparation, chemical instruments and methods, carbon preparation/purification, etc., can solve the problems of cumbersome anti-oxidation treatment, increased thermal conductivity, pore blockage, etc., and achieve improved Antioxidant performance, reduced weight loss ratio, and improved antioxidant properties

Active Publication Date: 2022-05-17
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

One of the methods is to prepare an anti-oxidation coating on the surface of the material. First, the carbon airgel is embedded in the inorganic powder, and then the second coating is prepared by chemical vapor deposition after sintering. This anti-oxidation treatment is very cumbersome.
Another method is to impregnate the carbon airgel into the anti-oxidation precursor solution, and then form an anti-oxidation coating on the surface of the carbon particles through a series of reactions, and impregnate the carbon aerogel into the siloxane precursor solution. Finally, pyrolysis generates an anti-oxidation film on the surface of carbon particles; in the article Anti-oxidation performance of carbon aerogelcomposites with SiCO ceramic inner coating [Ceramics International 45 (2019) 9704–9711)], the carbon aerogel is impregnated into the SiCO precursor In the solution, SiCO coating is formed on the surface of carbon particles after pyrolysis at high temperature, but this method will lead to the increase of particles in the airgel structure, the reduction of pores, the blockage of pores, and the great increase of thermal conductivity

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  • A kind of anti-oxidation carbon airgel composite material and its preparation method and application

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preparation example Construction

[0027] The present invention provides a method for preparing an antioxidant carbon aerogel composite, comprising the following steps:

[0028]a preparation of carbon aerogel bulk material: resorcinol, formaldehyde, water and sodium carbonate mixed evenly, to give a precursor solution, wherein the resorcinol and formaldehyde molar ratio of 1: (1.8-2.2); the molar ratio of resorcinol to sodium carbonate is (50 ~ 2000): 1; the molar ratio of water to resorcinol is (60 ~ 300): 1, preferably, the resorcinol and formaldehyde molar ratio of 1: 2, the molar ratio of resorcinol to sodium carbonate is (500 ~ 1500) :1, the molar ratio of water to resorcinol is (100~ 250): 1, so that the structure of the carbon aerogel material prepared after such optimization is intact macroscopically without cracking; the precursor solution is left at 25-35 °C for 20-28 hours, 55-65 °C for 20-28 hours, 85-95 °C for 2-4 days, so that the reaction is fully carried out, the wet gel is dried at 55-65 °C for 2-...

Embodiment 1

[0038] The present embodiment provides a method for preparing an antioxidant carbon aerogel composite, comprising the following steps:

[0039] 1) The resorcinol, formaldehyde, water and sodium carbonate are mixed evenly according to the formula, and the molar ratio of each raw material in the formula is: resorcinol: formaldehyde = 1:2, resorcinol: sodium carbonate = 500: 1, water: resorcinol = 200: 1, after thorough stirring, the carbon aerogel precursor solution is obtained. Let stand at 30 °C for 24 hours, 60 °C for 24 hours and 90 °C for 3 days to obtain a wet gel, placed in an oven at 60 °C to dry for 3 days to obtain a dry gel.

[0040] 2) Prepare admixture solution of sodium lauryl sulfate with a mass fraction of 1% and the mass fraction of 3% polyvinylpyrrolidone solution, the dry gel obtained in step 1) is immersed in the aqueous sodium lauryl sulfate for 30 min, and then the polyvinylpyrrolone aqueous solution is added, and the ultrasonic treatment is continued for 30min...

Embodiment 2

[0047] The present embodiment provides a method for preparing an antioxidant carbon aerogel composite, comprising the following steps:

[0048] 1) Resorcinol, formaldehyde, water and sodium carbonate are mixed uniformly according to the formula, and the molar ratio of each raw material in the formula is: resorcinol: formaldehyde = 1:2, resorcinol: sodium carbonate = 1500: 1, water: resorcinol = 250:1, after thorough stirring, the carbon aerogel precursor solution is obtained. Let stand at 30 °C for 24 hours, 60 °C for 24 hours and 90 °C for 3 days to obtain a wet gel, placed in an oven at 60 °C to dry for 3 days to obtain a dry gel.

[0049] 2) Prepare admixture solution of sodium lauryl sulfate with a mass fraction of 3% and polyvinylpyrrolone solution with mass fraction of 8%, the dry gel obtained in step 1) is successively immersed in the aqueous sodium dodecyl sulfate for 30min, and then the polyvinylpyrrolone aqueous solution is added, continue the ultrasonic treatment for 30...

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Abstract

The invention discloses an anti-oxidation carbon airgel composite material and its preparation method and application. The preparation method of the anti-oxidation carbon airgel composite material comprises: preparing a carbon airgel block material, and carrying out dry gel Hydrophilic modification, prepare glass-ceramics precursor solution, immerse the dry gel surface after hydrophilic treatment into the glass precursor sol, make the glass precursor sol gel and age on the surface of the carbon airgel, and then pass Drying, sintering and carbonization form a dense glass layer on the surface of the carbon airgel; repeat the above steps on other surfaces of the carbon airgel to obtain an anti-oxidation carbon airgel composite material with a glass-ceramic layer wrapped on the surface. The invention improves the oxidation resistance of the carbon airgel material, has simple process and is easy to realize.

Description

Technical field [0001] The present invention relates to the field of carbon aerogel composites, specifically about an antioxidant carbon aerogel composite material and preparation method and application thereof. Background [0002] Carbon aerogel has a very high porous nanostructure, which is used as an insulation material, which can effectively reduce the thermal conductivity of solid, gaseous and radiated, and the thermal insulation performance is better than that of traditional inorganic fiber felt or foam inorganic materials. Moreover, in the various types of aerogel materials that have been studied so far, the use temperature of carbon aerogel is the highest, and it can reach more than 2200 °C in a vacuum or inert atmosphere. However, in the actual application process, it is often impossible to isolate oxygen, which will lead to the oxidation of the carbon aerogel material, the weight loss and destruction of the material, and the thermal insulation performance is reduced, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05B01J13/00C03C10/00B64C1/40B64G1/58
CPCC01B32/05B01J13/0091C03C10/00B64C1/40B64G1/58Y02B80/10
Inventor 艾兵张世超孙现凯孙浩然方凯陈玉峰
Owner CHINA BUILDING MATERIALS ACAD
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