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Block aerogel composite material and preparation method thereof

A composite material and aerogel technology, applied in the field of bulk aerogel composite materials and their preparation, can solve the problems of breaking or separating from fibers, falling off of aerogel fragments, and high hardness of the composite, so as to improve mechanical properties. , The effect of reducing preparation cost and high specific surface area

Inactive Publication Date: 2012-12-05
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting composite is relatively hard, and the particles will be broken or separated from the fibers under the action of external force, so the airgel fragments will fall off the fabric

Method used

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  • Block aerogel composite material and preparation method thereof
  • Block aerogel composite material and preparation method thereof
  • Block aerogel composite material and preparation method thereof

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preparation example Construction

[0087] In the preparation of the organic sol, those skilled in the art can select or adjust the ratio of each component according to the actual situation, so as to obtain the desired organic sol.

[0088] According to an embodiment of the present invention, the organic sol precursor used is resorcinol and formaldehyde, and the basic catalyst is sodium carbonate, wherein the molar ratio of resorcinol: formaldehyde: water: sodium carbonate can be 1:1.5 ~2.5:50~1500:0.001~0.1, preferably 1:1.8~2.2:50~1000:0.002~0.1, preferably 1:1.8~2.0:150~500:0.005~0.05.

[0089] When the sol is a metal oxide sol, the specific operation steps may include: uniformly mixing the metal oxide sol precursor with alcohol and water, adding an acidic catalyst and stirring to obtain the metal oxide sol.

[0090] It should be understood that the materials used in the preparation process of the metal oxide sol are not particularly limited, and the precursor of the organic sol includes butyl titanate, titan...

Embodiment 1

[0113] Inoculate the pre-cultivated seed culture solution of Acetobacter xylinum into 12L of Acetobacter xylinum fermentation medium with 10% inoculum, shake fully, and culture at a constant temperature of 30°C for 15 days to obtain cellulose hydrogel . Among them, the Acetobacter xylinum fermentation broth contains 2% glucose, 0.5% peptone, 0.5% yeast powder, 0.27% disodium hydrogen phosphate pentahydrate, 0.115% citric acid-hydrate, pH 6.0, and high temperature sterilization for 20 minutes.

[0114] The cellulose hydrogel fermented by microorganisms was placed in 5% NaOH aqueous solution at 90°C for 10 hours, and then placed in deionized water at 85°C for 15 hours, during which the deionized water was replaced 3 times, and then the volume ratio was 1: The mixed solution of 1 tert-butanol and deionized water was subjected to solvent replacement at 60°C for 10 hours, during which the mixed solution was replaced twice, and then freeze-dried until the sample was completely dry t...

Embodiment 2

[0119] Inoculate the pre-cultivated seed culture solution of Acetobacter xylinum into 10L of Acetobacter xylinum fermentation medium with 12% inoculum, shake fully, and culture at a constant temperature of 30°C for 20 days to obtain cellulose hydrogel . Among them, the Acetobacter xylinum fermentation broth contains 4% glucose, 0.8% peptone, 0.5% yeast powder, 0.35% disodium hydrogen phosphate pentahydrate, 0.115% citric acid-hydrate, pH is 6.2, and is sterilized at high temperature for 20 minutes.

[0120] The cellulose hydrogel fermented by microorganisms was placed in 6% NaOH aqueous solution and treated at 90°C for 8 hours, and then placed in deionized water at 85°C for 15 hours. During this period, the deionized water was replaced 3 times, and then the volume ratio was 1: The mixed solution of 1 tert-butanol and deionized water was subjected to solvent replacement at 58°C for 10 hours, during which the mixed solution was replaced twice, and then freeze-dried until the sam...

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Abstract

The invention discloses a block aerogel composite material and a preparation method thereof. The block aerogel composite material consists of reticular cellulose nano fiber skeletons and sol in a combining way, wherein the porosity of the aerogel composite material is 80-99.5 percent, the density is 0.015-0.680g / cm<3>, the BET specific surface area is 150-1200m<2> / g, the coefficient of heat conductivity is 0.015-0.045Wm<-1>k<-1> and the modulus of elasticity is 0.5-150MPa. The block aerogel composite material provided by the embodiment of the invention has the advantages that since the material consists of the reticular cellulose nano fiber skeletons and the sol in the combining way, the mechanical property of the block aerogel composite material can be obviously improved, the heat conductivity is low, the density is small and the specific surface area is large; and besides, the equipment cost can be decreased by adopting a relatively low and safe freeze-drying method to replace the traditional supercritical drying method.

Description

technical field [0001] The invention relates to the technical field of composite materials, and more specifically, the invention relates to a bulk airgel composite material and a preparation method thereof. Background technique [0002] Airgel is a special gel that replaces the liquid in the gel with gas without essentially changing the network structure or volume of the gel itself. It is the product of hydrogel or organic gel after drying. It has the characteristics of nano-scale porous structure and high porosity, and is one of the solid materials with the smallest density known so far. Due to the characteristics of large specific surface area, high porosity, low density, and low thermal conductivity, aerogels have great application potential in super insulators, high-energy physics, high-efficiency catalysts and catalyst carriers, and energy storage materials. At the same time, the ultra-low density and ultra-high specific surface area of ​​bulk airgel make it very promi...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 向军辉赛华征邢丽宋波赵春林李真酉
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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